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Operator
Good morning, and welcome to the WESCO Fourth Quarter and Full Year 2020 Earnings Conference Call. (Operator Instructions) Please note that this event is being recorded.
I would now like to turn the conference over to Leslie Hunziker. Please go ahead.
Leslie Hunziker - SVP of IR & Corporate Communications
Thank you, and good morning, everyone. Before we get started, I want to remind you that certain statements made on this call contain forward-looking information. Forward-looking statements are not guarantees of performance and, by their nature, are subject to inherent uncertainties. Actual results may differ materially. Please see our webcast slides as well as the company's SEC filings for additional risk factors and disclosures. Any forward-looking information relayed on this call speaks only as of this date and the company undertakes no obligation to update the information to reflect changed circumstances.
Today, we'll use certain non-GAAP financial measures. Required information about these non-GAAP measures is available on our webcast slides and in our press release, both of which are posted on our website at wesco.com. On this call this morning, we have John Engel, our CEO; and Dave Schulz, WESCO's Chief Financial Officer. Now I'll turn the call over to John.
John J. Engel - Chairman, President & CEO
Well, thank you, Leslie, and a warm welcome to WESCO. It's great to have you on the team.
Leslie Hunziker - SVP of IR & Corporate Communications
Thank you.
John J. Engel - Chairman, President & CEO
Good morning, everyone, and I hope that all of you have been staying safe and healthy. I'll start out with a summary of 2020 and some of our most notable accomplishments. Dave will take you through, at that point, an update on our rapid progress that we're making on integrating Anixter. and he'll take you through our fourth quarter and full year results. And then give you an overlook -- overview of our outlook for 2021. After that, I'll offer a quick recap before we open the line for questions.
So starting out, 2020 was an extraordinary year for WESCO. We completed a transformational acquisition of Anixter, doubling our size of the company and changing our trajectory for years to come. We're off to an excellent start and are more bullish than ever on delivering against our substantial value creation potential. In addition, I'm inspired by and would like to thank all of our associates for their dedication, commitment, resilience and extraordinary effort in serving customers during the global pandemic.
As most of you know, we announced our agreement to acquire Anixter International last January, and we were very pleased to close the transaction a little more than 5 months later. The first 6 months of the integration have gone exceptionally well. Our synergy captures exceeded our expectations, both in terms of size of the opportunities as well as the rapid pace of our execution. You'll recall last quarter, we increased our 3-year post-merger cost synergy target from $200 million to $250 million. In addition, the highly complementary nature of WESCO and Anixter and our substantially larger scale has enabled us to build a cross-sell pipeline that is starting to show up in our top line results, and this is very encouraging.
At the same time that we are working towards closing the transaction and beginning integration, we were managing through an incredibly challenging macro environment driven by the COVID-19 global pandemic. In response to this, we took quick and decisive actions, centered really on 3 priorities and we've talked about this in the past: first, protecting our employees; second, ensuring that our customer experience, service and support was seamless and exceptional; and number three, taking the necessary actions to reduce our cost and efficiently manage our operations.
The diversity of our end markets, our differentiated service offerings, our global footprint, and the attractive secular trends we support, helped temper the effects of COVID-19 on our business last year.
On the right-hand side of this page, you can see the attractive secular growth trends that are driving demand for electrical, communication, security and utility solutions, all of which will continue to drive demand in the years ahead. All 3 of our strategic business units have the scale and capabilities to deliver growth associated with the increasing use of automation, machine-to-machine connections, the electrification of our infrastructure and the demand for faster bandwidth and data center capacity. Emerging growth trends such as the relocation of supply chains back to North America and increased remote connectivity also drive additional growth opportunities.
In combining WESCO and Anixter, we have created the industry leader in electrical, communications and utility distribution and supply chain services. Just as these secular trends are poised to drive strong growth in all the markets we serve.
Now moving to Page 5. During our second quarter earnings call on August, we highlighted our priorities for the second half of 2020. They were to take share, deliver synergies and focus our free cash flow generation on debt reduction. In the fourth quarter, we saw improving sales momentum coming out of the COVID-19 trough and are successfully utilizing our increased scale and capabilities to take share. Sales were up 4% sequentially in Q4 on a workday-adjusted basis, when typically, our sales declined sequentially in the fourth quarter. We closed the year with a record year end backlog, which sets us up well to continue building on this positive momentum in 2021.
Even more importantly, January sales reflected a return to year-over-year sales growth, with sales up low single digits on a comparable workday basis. We've made great progress across the board on our synergy capture efforts. Our team is laser-focused on driving synergies. As we have combined into one organization, we've made great progress in reorganizing -- recognizing the savings from duplicative corporate overhead and functional integration. Adjusted gross margin was up versus the pro forma prior year for the second consecutive quarter. Our management team is now in place, and we've been able to streamline roles across functions for greater efficiency. We are on track to meet the higher synergy targets that we announced last quarter and have very high confidence in delivering upside to these targets.
Free cash flow was another major highlight for us in 2020. We generated $586 million of free cash flow last year, close to the $600 million target that we set for 3 years out and more than 250% of our adjusted net income. This enabled us to reduce net debt by almost $400 million and leverage by 0.4x in just the first 6 months since the Anixter close. And last month, we completed a debt refinancing of our 2021 notes that reduces our interest expense by $20 million per year, which will further enhance cash flow and support achieving our 2023 debt reduction and debt repayment target.
Overall, we are very pleased with the results we're delivering on all fronts. We're entering 2021 from a position of strength with an unwavering commitment to our strategies and growth plan and an extraordinary team of associates and outside partners. Coupled with our strong execution and accelerating progress on the integration, we have very high confidence in our ability to deliver sustainable long-term value creation. 2021 will be another positive and important stepping stone in our transformational journey.
With that, I'll turn the call over to Dave, who will take you through our financial results. Dave?
David S. Schulz - Executive VP & CFO
Thank you, John. Before getting into the results for the fourth quarter, I'd like to address where we are with cost synergies from the integration with Anixter. When we announced the merger with Anixter back in January of 2020, we anticipated a mid-2020 close and provided investors with our view on synergies for the first 3 years, post close. On Slide 7, you'll see that we've converted our synergy time line to align with our fiscal year-end. The chart on the left side of the slide shows the cumulative realized cost synergies that we expect to generate by fiscal year. Realized synergies are those that are reflected in our income statement. In the first 6 months post close, we have realized $39 million of cost synergies, $15 million in Q3 and $24 million in Q4. In 2021, we expect to realize an additional $90 million of synergies, bringing our total to $130 million by the end of the year.
Consistent with the expectation we provided on our last earnings call, we still anticipate realizing $100 million of cost synergies in the first 12 months of the merger through June of 2021, with a cumulative cost synergies of $130 million by December.
In addition to the cumulative cost synergies, we have shown the cumulative onetime operating expenses to achieve the synergies below the bar chart. As you can see, we have spent $37 million in onetime operating costs in the first 6 months and expect to spend an incremental $78 million on onetime operating expenses to generate the incremental $90 million of synergies in 2021. By June of 2023, we expect to generate $250 million of realized cost synergies on a trailing 12-month basis. In total, this $250 million target is comprised of initiatives that are approximately 20% related to cost of goods sold and approximately 80% related to reducing operating expenses. This is consistent with the sources of synergies we previously discussed, and we expect the synergies related to corporate overhead, G&A and field operations will drive the SG&A synergies, with the majority of the supply chain synergies impacting cost of goods sold.
Turning to Slide 8. In Q4, we delivered another quarter of strong free cash flow that represented more than 160% of net income. For the full year, free cash flow was $586 million or more than 250% of adjusted net income. This level of free cash flow generation highlights WESCO's ability to generate strong cash flow throughout the economic cycle and especially during down cycles like the one related to COVID-19. This resilient model, coupled with our execution on the integration with Anixter, gives us very high confidence that we will successfully reduce leverage below 3.5x adjusted EBITDA over the next 2.5 years, consistent with our commitment when we announced the merger.
Our capital allocation priority remains unchanged. We will allocate capital to support the integration, invest in our business and rapidly delever the balance sheet. We made substantial progress on this goal in 2020 as we reduced net debt by $389 million and leverage by 0.4x trailing 12 months adjusted EBITDA since closing the Anixter acquisition in June. Net debt was reduced by $109 million in the fourth quarter following our first semiannual payment of $103 million of interest on our new 2025 and 2028 notes. Liquidity, which is comprised of invested cash and borrowing availability on our bank credit facilities, is exceptionally strong and totaled $1.1 billion at the end of the fourth quarter.
In early January, we increased the size of 2 bank credit facilities by a combined $275 million. We utilized this higher capacity and existing availability to retire our $500 million 2021 notes.
Turning to Page 9. This summary table compares our fourth quarter adjusted income statement results to the pro forma for the prior year period and our adjusted results in the third quarter. Because Anixter and WESCO had different fiscal reporting periods, there was an extra week of Anixter sales in the fourth quarter of 2019, making comparisons to that period less meaningful. For that reason, most of my comments today will be on a sequential comparison against the third quarter.
On a reported basis, sales were flat versus the third quarter. It is important to note that the fourth quarter had 3 fewer workdays compared to the third quarter. When adjusting the results to a comparable workday basis, sales were up more than 4%. The momentum has continued into January, with workday-adjusted sales up low single digits versus the prior year. Adjusted gross margin, which excludes the effect of merger-related fair value adjustments to inventory and an out-of-period adjustment related to inventory absorption accounting, was 19.6%, in line with the prior quarter and up 10 basis points versus the prior year. We are seeing continued traction from our margin improvement initiatives, including early results from deploying Anixter's proven gross margin improvement programs across the combined business.
Note that the out-of-period adjustment relates to the cumulative effect of the adjustment to inventory since WESCO was spun out of Westinghouse. In no period was the adjustment material to our reported results. Adjusted income from operations was $172 million in the quarter after adjusting to remove the effect of merger-related costs of $40 million, merger-related fair value adjustments on inventory of $16 million, and the out-of-period adjustment of $23 million related to inventory absorption accounting. Adjusted income from operations was $28 million lower than the third quarter, which primarily reflects an increase in SG&A related to the discontinuance of temporary cost reduction measures we had taken in response to COVID-19.
As we had highlighted in our Q3 earnings call and reiterated in the 8-K that we filed on December 15, we reinstated the full salaries of legacy WESCO employees, instituted 2020 merit adjustments and resumed the retirement savings plan employer matching contributions effective October 1, 2020. These measures, along with certain other actions, had generated more than $50 million of savings during the second and third quarters of 2020 relative to WESCO's Q1 SG&A run rate before the merger. In total, adjusted income from operations was $13 million lower than prior year pro forma on sales that were $223 million lower, representing a decremental margin of approximately 6%.
Adjusted EBITDA, which excludes the effect of the adjustments I just mentioned as well as stock-based compensation and other net adjustments, was $216 million or 5.2% of sales lower than the third quarter due to the higher SG&A I just discussed and approximately in line with the prior year. Adjusted diluted EPS for the quarter was $1.22. A full reconciliation of adjusted EPS is included in our press release.
Before getting to the SBU results, I'd like to remind you of our new 3-segment structure on Slide 10, which we introduced in the third quarter. First, Electrical & Electronic Systems, or EES, which is approximately 40% of our company's total business; second, Communications & Security Solutions, or CSS, which is roughly 1/3 of the company's revenue; and then third, Utility & Broadband Solutions, or UBS, which represents the remaining 27% of the overall sales across the enterprise.
As we have said previously, one of the most meaningful and positive discoveries post close is how complementary the WESCO and Anixter portfolios are. The pie charts on this page depict the legacy WESCO and legacy Anixter composition for each of the 3 businesses. It is this very highly complementary suite of products and solutions that enables us to offer even more end-to-end solutions for our customers and supports the cross-sell programs John mentioned. Additionally, we found that customer overlap between the legacy companies was more favorable than expected.
Turning to Slide 11, reported sales in our EES segment were up 1% versus the third quarter on a reported basis and up 6% on a comparable workday basis. This growth reflects improving construction demand in North America in the second half of the year as well as the first sales from our cross-sell initiatives and our ability to offer a complete electrical package to our customers. We have continued to see some project delays, primarily driven by COVID-19, but still no cancellations.
EES backlog was a fourth quarter record, consistent with the trend we have observed since last March, as some projects are delayed, and we continue to be awarded new projects. We also continue to see increasing momentum in our industrial and OEM business. In the fourth quarter, MRO and project activity levels improved in all of the verticals we serve. Adjusted EBITDA of $94 million represented 5.6% of sales, about $14 million lower than the third quarter. The decrease primarily reflects higher SG&A due to the restatement of the temporary COVID-19 cost reductions discussed earlier.
Turning to Slide 12. Our CSS segment closed out a strong year, in part driven by an increased focus on bandwidth needs stemming from COVID-19 as well as our global scale, which offers greater value to our customers. On a reported basis, sales were 1% lower than the prior quarter but were up 3% on a comparable workday basis. We are taking share in all geographic regions and especially in areas outside the United States. As with EES, we saw continued positive momentum throughout the quarter. Specifically, we experienced growth in our network infrastructure markets that was driven by increasing global accounts and continued strong demand in data centers, in-building wireless and professional audiovisual applications. Sequentially, security sales were up low single digits on a comparable workday basis, driven by expanding demand for secure network and IP security applications.
CSS is uniquely well positioned to benefit from several of the secular growth trends that we have highlighted as the pace of technological innovation, demand for data and reliance on security are all driving an accelerated pace of both new installations and upgrades to existing systems. Profitability was strong. Adjusted EBITDA was $112 million or 8.2% of sales. This was 50 basis points higher than the prior year but down sequentially from the third quarter, primarily reflecting the reinstatement of temporary cost reductions.
Turning to Slide 13. Sales in our UBS segment were down slightly versus the third quarter on a reported basis but up 4% on a comparable workday basis. Strong utility demand continued this quarter, as our utility customers continue to invest in grid hardening and modernization projects as well as LED lighting and automation projects. The broadband business was also resilient to COVID-19, driven by 5G deployments, last-mile fiber installations and increasing broadband projects. The global demand for data and high-speed connectivity has never been greater due to the step change in requirements driven by remote work and school environments.
Adjusted EBITDA of $79 million was in line with the prior year and up 10 basis points as a percentage of sales. Adjusted EBITDA margin was down sequentially on slightly lower sales and the restoration of COVID-related cost actions.
Turning to Slide 14. I'll walk you through our outlook for 2021. On a pro forma basis, sales were $16 billion in 2020. In 2021, we estimate market growth of roughly 3% to 5%. We recognize that COVID and the timing of broad scale vaccinations may create volatility and influence the overall demand pattern of our business. We are encouraged by the economic indicators and expect the demand environment to continue to improve as we progress through 2021. On top of that, we expect that the combination of the continued outperformance and our cross-sell programs will grow sales 1% to 2% above the market.
Lastly, keep in mind that 2021 has one fewer workday than 2020, and we will have the impact of the U.S. branch sale completed in Q3 of 2020 as well as the expected completion of the Canadian divestitures in the first quarter. Aggregate sales relating to the divested businesses are approximately $125 million. The impact of these will be a headwind of approximately 1%. So in total, we expect sales to grow 3% to 6%. We expect differences in foreign exchange rates to be neutral to slightly favorable for the full year.
On the right-hand side of the page, we have provided a bridge for our 2020 pro forma adjusted EBITDA margin of 5.3% to our outlook for adjusted EBITDA margin of 5.4% to 5.7%. We expect to benefit from improving mix, market outperformance and operating leverage, which we will expect to collectively drive about 50 to 80 basis points of margin expansion. In addition, as you saw on the prior page, we expect to generate an incremental $90 million of realized cost synergies in 2021, which will contribute approximately 55 basis points of additional EBITDA margin. Partially offsetting these 2 margin drivers will be the restoration of the employee compensation benefit costs discussed previously and the restoration of a full accrual for incentive compensation, the aggregate amount of which is approximately 90 basis points.
Continuing down the income statement, we expect our effective tax rate to be approximately 23% and adjusted diluted EPS in the range of $5.50 to $6. We assume a diluted share count of approximately 51.5 million shares. We expect to spend between $100 million to $120 million on capital expenditures in 2021, much of which will be invested in the early stages of aligning our systems and investing in digital tools. We expect to continue generating substantial free cash flow, which we're forecasting to be at least 100% of adjusted net income.
As we look at the drivers of the first quarter of 2021, we expect to benefit from $28 million of realized cost synergies in the quarter. Please keep in mind that the first quarter has 2 fewer workdays in the first quarter of 2020, as shown in the table.
With that, I'll return the call back to John for his summary.
John J. Engel - Chairman, President & CEO
Thanks, Dave. We covered a lot of material this morning. Before opening your call to questions, I'd like to walk you through a quick summary.
Again, 2020 was a transformational year for WESCO and highlighted many of the company's strengths. First, we respond with quick and decisive actions, as I mentioned earlier, in response to the global COVID-19 pandemic and delivered excellent performance through the downturn. Number two, our integration with Anixter is off to an excellent start, and it is accelerating. We made substantial progress on the integration in just the first 6 months, and we were very pleased to be able to increase our synergy targets. Our new leadership team is the strongest management team in our history and is driving our high-performance culture.
We have launched our cross-sell programs in all 3 of our business units and are already seeing positive results. And three, and most importantly, the business is uniquely and well positioned to capitalize on the highlighted secular growth trends that will drive demand for our full spectrum of end-to-end solutions for years to come.
2020 marked a watershed year and the beginning of a new era for WESCO. As the industry leader, we are now larger and more diversified with differentiated scale and capabilities in what remains a highly fragmented industry. We're exceptionally well positioned and intend to lead not only a digital transformation of our business but also of our industry. So with that, I'd like to open the call for questions.
Operator
(Operator Instructions) The first question comes from Sam Darkatsh with Raymond James.
Samuel John Darkatsh - Research Analyst
Two questions, if I might. The first, you're calling out, I guess, if my math holds, about $150 million of resumed costs in fiscal '21 from COVID restoration, incentive comp benefits and so on. We knew about the $50 million in specific to COVID. The $100 million of incentive comp and benefits, at least to me, was a surprise in its scale, to the extent that it doesn't look like you're going to be levering the $500 million to $1 billion in incremental sales on an organic basis.
First off, I think my math holds. But why not lever that type of incremental sales, especially knowing that price and price/cost and presumably billing margins are going to be favorable for you this year?
David S. Schulz - Executive VP & CFO
Yes, Sam, thank you for the question. We were very clear that we had $50 million on the legacy WESCO business that was COVID-related actions that we took in 2020, and obviously, that's being restored as we enter to 2021. We also mentioned on several of our earnings calls that our results were well below our expectations coming into 2020. And as such, we have not paid out or accrued for full incentive compensation and sales commissions here in 2020, and you see that in our results.
So similar to what we've done in previous years, our intent is to include 100% target payouts, not only on the incentive compensation but also our sales commissions. We also do have a couple of other volume-related increases to SG&A, including some higher benefits costs that we've included in that outlook of a 90 basis point drag for 2021.
Samuel John Darkatsh - Research Analyst
Okay. My second question, if I might, pardon me. You had $24 million in synergies that you realized in the fourth quarter, and it looks like you're guiding to $28 million in the first quarter. I would have thought that the synergy recognition would have been a step function higher -- meaningful step function higher in the first quarter over the fourth quarter because of the timing of vendor supply agreements and them rolling over, and therefore, your benefits to purchasing. Is there an offset to that? Or what am I missing in terms of thinking about sequential synergies Q1 over Q4?
David S. Schulz - Executive VP & CFO
Yes, Sam. A lot of the benefit that we're expecting to see in the first quarter, particularly, will really be more on the SG&A side. You are correct that we are continuing to focus on some of our supplier agreements and getting the alignment between the 2 legacy programs. Obviously, we've included some of that in our expectations for the adjusted EBITDA margin. But right now, at this point, we don't expect there to be considerable cost of goods synergies, at least in the front half of the year for 2021.
John J. Engel - Chairman, President & CEO
And Sam, let me just make a comment because I think both of your two questions get at this, which is I want to be very clear that we have high confidence on our upside. And the upside is sales, sales growth, cost synergies, margin expansion and free cash flow generation. Our confidence is the highest it's ever been. As we've gone through the first 6 months plus post close, our confidence has increased, quite frankly. But we did not -- and appropriately, we believe, did not build that into our 2021 guide.
Operator
The next question comes from Deane Dray with RBC Capital Markets.
Deane Michael Dray - MD of Multi-Industry & Electrical Equipment & Analyst
I'd like to pick up where Sam left off there. In terms of this -- the rollback of the temporary costs, it looks like it hit the electrical segment disproportionately. It just -- in terms of like the margin hit. And I know you've given that for 2021, you sized it at 90 basis points. What was it for electrical or maybe for the 3 segments in the fourth quarter? Because it just feels like there wasn't a feathering back of these costs, but it was more just a full reversion there. So just take us through the size and maybe that will help us calibrate the impact.
David S. Schulz - Executive VP & CFO
Yes, certainly. So going back to what we talked about in the third quarter, on our COVID-related cost actions, again, this was really on just the legacy WESCO business, and obviously, we've done quite a bit of work to begin the integration. But now as we highlighted that COVID-related cost reduction of $50 million as part of our Q1 earnings call, as you see, that we had $28 million of benefit from that program in the third quarter that basically came back in the fourth quarter as we restored those activities.
If you take a look at the composition of our strategic business units, there are more sales from the legacy WESCO business within the EES SBU. And therefore, they took a higher portion of that recovery of COVID-related actions within the fourth quarter relative to the other 2 SBUs. So that's really what's driving that margin degradation in EES relative to the sequential numbers from Q3.
Deane Michael Dray - MD of Multi-Industry & Electrical Equipment & Analyst
That is actually very helpful. We're just looking -- the context of having higher WESCO legacy sales in the electrical segment. That's a good input there. And then...
John J. Engel - Chairman, President & CEO
And Deane, on that, again, it was temporary salary reductions, which then the benefits came with that 401(k) match. It wasn't a very -- as you know, and we've articulated a very aggressive set of actions. And so that mix effect, that you're seeing -- is what you're seeing as you -- as Dave highlighted.
Deane Michael Dray - MD of Multi-Industry & Electrical Equipment & Analyst
All right. So that color is helpful. And then second question. On Page 7, the whole cost synergies, the time line. Just as a reminder, these are net synergies? And are you seeing any sort of lost sales and branch consolidations, sales force reductions? Or any of the revenues walking out the door?
John J. Engel - Chairman, President & CEO
So I'll answer the second part, and Dave may want to tag on the balance. The very encouraging answer to this is we have not been. We feel very good about momentum in the marketplace and we're not seeing -- first of all, we have structurally addressed the combination of 2 companies with structural cost takeout, and we highlighted that we had over 650 full-time equivalents in the rest of the business. So we've been working that. We've not seen unplanned or unwanted attrition, point one. Point two, we are not seeing any share leakage. So very encouraged by our results thus far.
David S. Schulz - Executive VP & CFO
And Deane, let me address your question on Slide 7 of our deck. What we're showing here are essentially the gross cost synergies that we expect to achieve, which would be a structural takeout versus our 2019 pro forma and we're showing you separately the cost to achieve, which would be onetime in nature.
Operator
The next question comes from David Manthey with Baird.
David John Manthey - Senior Research Analyst
First question, you don't mention price in the sales outlook. But with copper and other industrial commodities being up as much as they are, how are you thinking about price increases in 2021? And related to that, when you're talking about the 50 to 80 basis points of EBITDA improvement for mix, share and leverage, how much of that is mix alone? Are you assuming gross margin is higher in 2021?
David S. Schulz - Executive VP & CFO
So Dave, for our outlook, we have not specifically called out the inflationary benefit that we would expect to see as commodity prices increase. It's always extremely difficult for us to project what that would look like for the full year. So clearly, we have seen what's going on within the current market. We know it's volatile. And our expectation is that as we see those cost increases, we will continue to pass them through to our customers. But inherently, we have not built that into our outlook for 2021.
John J. Engel - Chairman, President & CEO
And Dave, I will comment on gross margin. We're not guiding gross margins, but I'll give you some indication of how we're thinking about it because clearly, we're now seeing, I would say, for first quarter of this year, if you look at supplier price increases that we are aware of, been informed of, and we also have, obviously, a knowledge of what we -- suppliers are intending on doing to some degree before everything is fully rolled through. We work with them in conjunction.
The number and overall average increases of those price increases has increased. So clearly, about a year ago, we're seeing that momentum build. Net-net, that will be a good thing. And it will be a positive support for our margin expansion. We absolutely intend and are very focused on getting core gross margin expansion this year. We're just not guiding to that level, as you know. And what we've done and we've talked about in the last 2 quarterly earnings calls, Anixter did, I think, an outstanding job with their multiyear margin improvement program. We've taken that program, and there were some other refinements they wanted to make. So we incorporated those improvements, and that is being deployed enterprise-wide. So the refined version for Anixter has been deployed enterprise -- being deployed. And then across WESCO, and I -- we do fully intend and expect to see core gross margin expansion. I mean, Anixter's delivered 2.5-plus years of gross margin expansion, looking back every quarter, which is absolutely terrific in the environment that they -- that we collectively face. That environment, right, is going to get a bit better here with inflation increasing.
And then finally, we've got unmatched supply chain capabilities. And just if you look at the two together -- and this is more of the strategic benefit I was addressing earlier, more of the kind of the initiatives and tactical benefit. But strategically, we've doubled the size of the company. And we've got unmatched supply chain capabilities and we are in the process now of going through our category reviews. So we're going category by category by category and looking at the complete supplier lineup. And a part of that process, underneath the guys at the integration management office, fully dedicated staff driving execution, is to drive business to our preferred supplier partner. And that inherently will result in a larger, more strategic relationship with them. Net-net together, we'll be able to provide even better value, and I think that will be margin accretive as well. Does that help?
David John Manthey - Senior Research Analyst
It does. Thank you very much, John.
Operator
The next question comes from Christopher Glynn with Oppenheimer.
Christopher D. Glynn - MD & Senior Analyst
You guided EBITDA -- adjusted EBITDA margins for the segments, for the D&A in order to kind of bridge to the adjusted earnings on the P&L. Does the 4Q represent a good annualized run rate for the segments in total? What do you expect then for D&A?
David S. Schulz - Executive VP & CFO
It's a good proxy for what we're expecting for D&A in 2021. I mean, with the fourth quarter, you can see how our D&A came down slightly versus Q3. That's a good starting point as you're thinking about 2021.
Christopher D. Glynn - MD & Senior Analyst
Okay. And back to Slide 7 there, the cumulative onetime OpEx, we can tell the incremental amount. I believe that gets adjusted out within the merger cost buckets each quarter. I just want to verify that?
David S. Schulz - Executive VP & CFO
That is correct.
Christopher D. Glynn - MD & Senior Analyst
Okay. And then in terms of the restoration of costs, that $150 million per Sam's accurate amount there, how much of that run rate would you say was realized or restored in the fourth quarter, maybe on a percentage basis?
David S. Schulz - Executive VP & CFO
Yes. The only thing that really hit us in the fourth quarter, Chris, was that restoration of the COVID actions. And so we -- relative to Q3, we restored a little over $28 million of COVID-related cost actions. Here in the fourth quarter, the balance is really what we're expecting in terms of primarily target payouts and the impact of inflation on some of our benefits programs for 2021 that have not impacted 2020 in our numbers.
Operator
The next question comes from Nigel Coe with Wolfe Research.
Nigel Edward Coe - MD & Senior Research Analyst
I just wanted to just dig in a little bit deeper into Slide 14. Now in your adjusted EBITDA margin targets, that excludes stock-based comp, but stock-based comp hits. Yes. So I just wanted to size that. I think it's $35 million in 2020. Just wondering what that is. And then interest costs below the line, what should we [guide] in for that?
David S. Schulz - Executive VP & CFO
Certainly. So the stock-based compensation, you should assume approximately, yes, $35 million for a 2021 impact and again, as you mentioned, we do exclude that when we talk about our adjusted EBITDA, but that impact is included in the adjusted EPS numbers.
Nigel Edward Coe - MD & Senior Research Analyst
And then interest?
David S. Schulz - Executive VP & CFO
For interest expense, you're probably looking at somewhere in the range of $67 million to $70 million per quarter in 2021. That's taking into account what you saw here in Q4, but then we also do have the benefit of the 2021 notes being called, and we'll also be obviously managing our facilities down aggressively.
Nigel Edward Coe - MD & Senior Research Analyst
Okay. So $67 million to $71 million per quarter. So my broader question is that when I put all these inputs into my model, I'm struggling to [ease] up again to your EPS guidance range. So I'm wondering if there's some conservatism or hedge baked into that range over and above all the inputs you've given us.
David S. Schulz - Executive VP & CFO
Yes. Again, we've given you a fairly clear view of our expectations throughout the income statement. We've also provided you with our view of what you should expect in terms of the free cash flow generation. Again, we know that there's some volatility in the end markets. We're laser-focused on not only meeting the expectations we've set on delivering the synergies but exceeding them. And so I mean, I'll let you draw your own conclusion in terms of how we put together the guide. I mean, obviously, you've done the math. Again, we believe that we are just starting to see the true benefit of the strategic combination of WESCO and Anixter coming together in 2021 in terms of top line and our ability to drive cost synergies.
John J. Engel - Chairman, President & CEO
Yes. And Nigel, as I mentioned earlier, again, we -- very high confidence we have substantial upside completely down the P&L and with cash generation. Again, look at our cash generation in 2020. Look at it. A little under $600 million, which is a 3-year target that we had set. And again, we did not build that into the guide. And we think appropriately so.
I mean, let's keep in mind that we -- there is a lot of positive indicators around overall market recovery. We feel very good about our trajectory because we think we're accelerating and doing better than market. But we're not fully recovered yet, and there's still many, many customers who have not "returned to work." And so that's what also informs what we think is an appropriate guide.
Operator
The next question comes from Tommy Moll with Stephens.
Thomas Allen Moll - MD & Analyst
I wanted to start on your outlook for revenue this year. If I'm interpreting correctly, I think we're looking at up 3% to 6% year-on-year across all 3 segments. But could you give us any insight, maybe a rank ordering of segments, which might skew toward the higher end of that range? Or the lower? Or relatedly, any kind of specific end market color you could give would be helpful.
John J. Engel - Chairman, President & CEO
Sure. The 3 businesses, I'll start with the one that is the most global, the second largest. It's CSS, Communications & Security Solutions. So when you take a look at our materials, Tommy, and you look at the secular growth trends we've called out, almost all of those directly impact that business. It's the most global business. It's been enjoying a multiyear run of very strong growth. That's the legacy Anixter NSS business and the legacy WESCO Datacom business. But it's a bit -- but mix-wise, it's substantially driven by the legacy Anixter NSS business. And so the secular growth trends really weigh in heavily there on the 3 businesses. That's the one that has -- in terms of end markets and performance against the end markets, the highest growth opportunity. So you put that at the higher end of the range on a relative basis.
UBS is next, Utility & Broadband Systems (sic) [Solutions]. Utility market, very stable. We've got a tremendous franchise business. We're pulling together the legacy, what used to be HD Supply that Anixter bought and the legacy WESCO Utility business. It's really strong, broad, service-oriented business. We feel very good about utility. There is pent-up demand for investment. We've talked about this at length in prior calls. That's -- we clearly see that in the future. And broadband is also part of that business unit that faces an exceptional set of growth opportunities, driven by a 5G build-out. And so I feel very, very good about that. I'd put that one kind of mid- to higher end of the range in a comparative sense in terms of where that ranks growth-wise, both market and performance.
And in comes EES. It's our largest business. And that's predominantly the legacy WESCO electrical business plus Anixter's wire and cable business, just to remind everyone. We're now positioned to sell the complete electrical package. So that's the breakout move for us. That's the strategic power of that combination. From an end market perspective, it is a global business, okay? But end market, it's really big industrial exposure, big construction exposure. So the industrial exposure we're seeing, as we're all -- I know many of you have seen this, but we're clearly hearing it from our customers, improving demand, positive momentum vector in terms of industrial spending. There's some -- there's turnaround projects that have been delayed. There's other spend levels that we're getting good indications should increase as we move through 2021 and the economy recovers.
For construction, we're predominantly nonresi, very little direct residential construction exposure. I mean, the good news there is that residential ended 2021 -- 2020 that is on a very strong note. That portends well for nonresi. But nonresi this year, I would say, will be a mixed bag. There'll be some verticals that are going to grow and could have some nice -- very nice growth, health care, education, infrastructure. There's some other verticals that are going to remain pressured, and that's oil and gas. So net-net, that hopefully gives you a sense. We've got 3 businesses. We all expect that all 3 to grow. And the largest kind of grower is probably at the high end would be CSS, UBS right behind it and then EES, the Electrical & Electronic Solutions.
I will say this about construction though. Despite kind of a mixed bag outlook on the nonresi market in 2021, I think most folks have that. For us, in particular, and consider this a special cost driver, we ended last year with an all-time year-end record backlog, and that speaks to our project business. And we haven't seen any material cancellations. There's just been some spotty delays here or there. So it sets up very well for us, I think, in 2021 in our bid activity levels for projects, both nonresi and industrial and even into the commercial, institutional and governmental markets, those customers. Our project activity levels -- the quoting activity levels, let me say, very, very robust to start the year. Our opportunity pipeline is also at a record level.
Thomas Allen Moll - MD & Analyst
That's all very helpful and very much appreciated. I'll shift to one follow-up question here to drill down a bit more on the first quarter. So we don't have official guidance in terms of the outlook here. But I would ask for any kind of color you could give us on margin expectations. It sounds like there's some cross currents with some incremental synergy capture and then with the offset of some of the incremental costs. And I think specifically, you called out, of the -- we broke up the $150 million for the full year into $50 million, COVID-related, that's already hit in Q4. But $100 million, on an annualized, that has yet to hit. And so presumably, some of that will offset in Q1. So anything you could frame for us there in terms of the incremental possibilities? Or maybe even just a margin bridge first quarter year-on-year? Or maybe first quarter sequential? Anything to just calibrate our expectations would be helpful.
David S. Schulz - Executive VP & CFO
Yes. Tom, it's Dave Schulz. I appreciate the question. The one thing that I would call out is if you look historically at the WESCO business, the Q1 is primarily our lowest adjusted EBITDA margin quarter of the year. Also in Q1 of 2020, we did not have the COVID-related cost actions. So that will create a little bit of a different comparison versus Q3 and Q4 going forward.
John J. Engel - Chairman, President & CEO
And Q2.
David S. Schulz - Executive VP & CFO
And Q2.
John J. Engel - Chairman, President & CEO
Early Q2. Right.
Operator
The next question comes from Steve Barger with KeyBanc Capital Markets.
Robert Stephen Barger - MD and Equity Research Analyst
John, you said this is the strongest management team in WESCO's history. And you also said you have high confidence in upside to sales, margin and free cash flow. But you decided not to build that into the 2021 guide. I just want to make sure I understand the message. If your confidence is that high, why not push the organization to accomplish that via stated goals?
John J. Engel - Chairman, President & CEO
Yes. Internally, we've got targets at well above our external targets. I've already said that, right? We've been very clear. Let's think back on how the last 13 months have unfolded. I mean, it was literally just a year ago, January, that we struck the deal to and got Anixter Board approval. They approved the WESCO bid for Anixter. It was only a few months later, well before close, that we put out 3-year targets. We put 3-year targets on cost synergies, on margin expansion, EPS growth as well as free cash flow generation. We closed the acquisition on June 22. We reported second quarter results that includes a 9-day stub period. We're well into the integration because we had started aggressively integrating planned -- integration planning pre close, and then we shot out of the gate with integration, and we had a flawless -- we use this term, flawless Day 1 close.
Look at our third quarter results. Very, very strong, right? Versus what expectations were. We beat our own expectations. Remember, we're driving the higher targets internally. And what we did was we were realizing the capture to -- on track with higher target levels. One quarter, first full quarter under our belt, we raised our guide around the synergies. And we raised them substantially. We went from $68 million in year 1 to $100 million. We went from $200 million in year 3 to $250 million. Substantial raise, right? Here we go through Q4, we absolutely delivered what we said. If you look at -- Q4 actually came in a bit stronger than what we signaled. But we didn't have a guide out there, but everything we signaled is even stronger than we thought. We never thought we'd have backlog build that strongly. We had -- the sales came in stronger, margins were solid, we have a record backlog, and we had exceptional free cash flow. We got close to $600 million of free cash flow, a little under, in our first full year. It didn't even include 4 quarters of Anixter yet, right? It only included 2 quarters of Anixter.
So that gives us the confidence as we're coming into 2021. What we don't control is the macro. So it's a long-winded wind up to say, what is out there that is out of our control. We don't control the macro. So there's still enough uncertainty around that. We reinstated the guide, we put a guide out there, and we think this is an appropriate guide, okay? But we -- and we continue to drive the internal targets that are above our external commitments with substantial margin, and that's what gives me the core -- the fundamental confidence.
Robert Stephen Barger - MD and Equity Research Analyst
So the key takeaway from that being that if the macro comes in the way you may expect internally, then you would expect to significantly outperform the guidance that you've put out today to start the year. Is that fair?
John J. Engel - Chairman, President & CEO
I mean you're trying to get me to guide to guide. I'm just going to tell you that -- which I'm not going to do because we just put a guide out there. But I think I will tell you that we're -- again, we're driving internal targets well above our external commitments. I said well above. The organization is lined up for that. We're super excited about this transformation and combination. Feel great about it, and it's our intent to deliver upside. With that said, we think we set the appropriate guide, given all the considerations, most importantly, macro.
Robert Stephen Barger - MD and Equity Research Analyst
Okay. So -- and it's The Street's job to make best guesses on macro conditions and whatever company info is out there. But -- and we'll never get it right exactly, of course. But this time, there was obviously a sizable disconnect between expectations and how WESCO is looking at earnings power. Any thoughts on how we can improve the messaging so we don't have this kind of one day volatility going forward?
John J. Engel - Chairman, President & CEO
Look, you asked me directly. If we were -- we didn't have a guide out there in 2020. Like most companies, we didn't guide Q4. But we were very clear on the temporary cost actions coming back in. And so I think that alone, plus we're also very clear about all the other aggressive actions we were taking on the cost structure. And so I just -- I think that my message is that versus what we expected and what we said, we absolutely exceeded our expectations in Q4. We didn't have a guide for 2021. We didn't have any signaling whatsoever. And I think just that kind of SG&A, if it wasn't set right for Q4, in the absence of a guide, it gets extrapolated into 2021, I understand that.
I think this is important that -- we are working aggressively to be as transparent as possible. We've got multiyear targets out there around the transformation, and we're going to continue to be -- report our progress against that very clearly. We think we're improving in that regard. Give us that feedback. We'd love to hear it. If you've got some other suggestions on how we could even be more clear about how we're performing against expectations, we'd love to get those inputs. We've got Leslie on board, leading IR for us now. She's an outstanding addition. And look forward to just continuing to improve in that area. We're all focused on continuous improvement. Lean is part of our culture, as you all know.
Operator
The next question comes from Chris Dankert with Longbow Research.
Christopher M. Dankert - Research Analyst
I guess, come at this a bit of another way, thinking about the first quarter SG&A. I mean, looking at that step-up from the fourth quarter, I mean, if we were to kind of baseline the first quarter SG&A in the $630 million range, is that in the right ballpark? Just trying to size how that $100 million rolls on. And obviously, it's got to be first half weighted, correct?
David S. Schulz - Executive VP & CFO
Yes, Chris. I mean if you -- the way to think about it is the -- we called out very specifically the $50 million. That's primarily a Q2 and Q3 comparable. But obviously, we were not giving the results of the company and after we integrated with Anixter, one of the other issues is that we do have this issue about the restoration of bonuses, sales commissions and the like, including some benefits and other inflation. Now that is going to be consistent throughout 2021. And so I think as you're thinking about how to frame that within the quarter, again, I think that you're going to see outside of that $50 million in Q2 and Q3, relatively consistently spread across the quarters.
Christopher M. Dankert - Research Analyst
Okay. Well, I guess, the $100 million beyond the COVID-related $50 million, I mean, is that actually a make-whole for incentive comp last year? Am I understanding that correctly?
David S. Schulz - Executive VP & CFO
That is correct. And so when you take a look at -- we did not meet our Board-approved plan. And because of that, we did not accrue nor are we planning to pay out at target compensation levels for 2020. Now that's been rolled into our numbers. We did speak to that in some of our earnings calls. And again, this is consistent with what we've done historically, particularly coming through the industrial recession, where we're not hitting our targets. We're not paying the incentive compensation. Our sales force is not getting their bonus payments consistent with previous years. We built that all in back at target 100% payout for 2021.
Christopher M. Dankert - Research Analyst
Okay. Okay. And I guess on a more optimistic note, in the slides, you guys highlighted reshoring as a positive driver. Is there anything tangible to offer on that dynamic? I mean, are we seeing actual projects coming through at this point? And thanks for the color there.
John J. Engel - Chairman, President & CEO
Yes. I will say this that we're having a lot of discussions. Obviously, it's virtual. I have a lot of discussions with customers. They're evaluating their operations. They're evaluating their supply chains in particular, and I've spoken about this at length really over the last couple of years, but this has been a real catalyst, this global pandemic. They're looking to obviously streamline, get efficiency, get supply chain cost out of the supply chain, let's say. But they're also looking at inherently supply chain risk. And that's what's driving them to look at reshoring.
I don't want to call out any specific examples per se. We are having those discussions with customers. They're sharing their plans and views with us. There's been a few examples. But again, I'd have to get specific, which I can't do on this call. But do I think that there's a potential for a broader trend there and kind of something that could be a meaningful driver of incremental growth opportunities in North America? I do. I do. Net-net, I do. I think if one thing the global pandemic did, it put a spotlight, actually a microscope, on the global extended supply chain and the fragility that was inherent in some of those. I'm talking the whole supply chain.
And so just thinking about supply chain risk and integrity, it's a big driver. And if those supply chains can be shortened, and which really is the impetus behind potentially reshoring, it changes the risk profile of the supply chain.
Operator
This concludes our question-and-answer session. I would now like to turn the conference back over to John Engel for any closing remarks.
John J. Engel - Chairman, President & CEO
Well, thank you all for your time today and your support. We have numerous follow-up calls that have already been scheduled. Dave and now, Leslie, and Will are available for your follow-up discussions. Have a good day, and please stay safe and healthy. Thank you.
Operator
The conference is now concluded. Thank you for attending today's presentation. You may now disconnect.