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Segment Information (Tables)

9 Months Ended

Sep. 30, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Information about the Company’s segments for both the three and nine months ended September 30, 2025 and 2024 is as follows:

			Corporate						Small Business						Public						Other						Headquarters						Total
Three Months Ended September 30, 2025
Net sales			$	2,255.4					$	433.8					$	2,349.8					$	698.4					$	—					$	5,737.4
Cost of sales			1,734.0						334.7						1,859.7						553.5						—						4,481.9
Gross profit			521.4						99.1						490.1						144.9						—						1,255.5
Other segment expense items(1)			326.1						45.4						258.2						101.9						80.6						812.2
Operating income (loss)			$	195.3					$	53.7					$	231.9					$	43.0					$	(80.6)					$	443.3
Other Segment Information(2)
Depreciation and amortization expense			$	29.0					$	2.1					$	19.3					$	7.3					$	15.6					$	73.3
Three Months Ended September 30, 2024
Net sales			$	2,161.2					$	379.7					$	2,335.7					$	640.0					$	—					$	5,516.6
Cost of sales			1,651.0						291.5						1,858.9						514.5						—						4,315.9
Gross profit			510.2						88.2						476.8						125.5						—						1,200.7
Other segment expense items(1)			301.2						42.6						236.6						93.0						45.7						719.1
Operating income (loss)			$	209.0					$	45.6					$	240.2					$	32.5					$	(45.7)					$	481.6
Other Segment Information(2)
Depreciation and amortization expense			$	18.8					$	0.9					$	14.2					$	6.9					$	28.3					$	69.1
Nine Months Ended September 30, 2025
Net sales			$	7,072.9					$	1,269.7					$	6,519.6					$	2,050.9					$	—					$	16,913.1
Cost of sales			5,444.1						987.4						5,230.8						1,631.8						—						13,294.1
Gross profit			1,628.8						282.3						1,288.8						419.1						—						3,619.0
Other segment expense items(1)			969.7						137.4						728.2						294.4						264.4						2,394.1
Operating income (loss)			$	659.1					$	144.9					$	560.6					$	124.7					$	(264.4)					$	1,224.9
Other Segment Information(2)
Depreciation and amortization expense			$	81.3					$	5.1					$	50.9					$	21.2					$	63.0					$	221.5
Nine Months Ended September 30, 2024
Net sales			$	6,492.3					$	1,143.5					$	6,303.7					$	1,873.2					$	—					$	15,812.7
Cost of sales			4,951.5						877.8						5,029.9						1,506.4						—						12,365.6
Gross profit			1,540.8						265.7						1,273.8						366.8						—						3,447.1
Other segment expense items(1)			956.8						128.0						698.4						284.8						136.4						2,204.4
Operating income (loss)			$	584.0					$	137.7					$	575.4					$	82.0					$	(136.4)					$	1,242.7
Other Segment Information(2)
Depreciation and amortization expense			$	57.9					$	2.7					$	41.9					$	21.1					$	82.2					$	205.8

(1)Primarily includes payroll and other coworker costs, advertising expense and other selling and administrative costs.

(2)Depreciation and amortization expense is primarily included within Other segment expense items.

Schedule of Disaggregation of Revenue

Geographic Areas and Revenue Mix

			Three Months Ended September 30, 2025
			Corporate						Small Business						Public						Other						Total
Geography(1)
United States			$	2,243.0					$	427.8					$	2,346.8					$	5.6					$	5,023.2
Rest of World			12.4						6.0						3.0						692.8						714.2
Total Net sales			$	2,255.4					$	433.8					$	2,349.8					$	698.4					$	5,737.4
Major Product and Services
Hardware			$	1,521.8					$	332.8					$	1,714.2					$	519.7					$	4,088.5
Software			492.8						73.8						435.1						91.9						1,093.6
Services			224.9						22.4						195.1						83.2						525.6
Other(2)			15.9						4.8						5.4						3.6						29.7
Total Net sales			$	2,255.4					$	433.8					$	2,349.8					$	698.4					$	5,737.4
Sales by Channel
Corporate			$	2,255.4					$	—					$	—					$	—					$	2,255.4
Small Business			—						433.8						—						—						433.8
Government			—						—						744.7						—						744.7
Education			—						—						911.2						—						911.2
Healthcare			—						—						693.9						—						693.9
Other			—						—						—						698.4						698.4
Total Net sales			$	2,255.4					$	433.8					$	2,349.8					$	698.4					$	5,737.4
Timing of Revenue Recognition
Transferred at a point in time where CDW is principal			$	1,884.2					$	373.6					$	2,022.1					$	587.6					$	4,867.5
Transferred at a point in time where CDW is agent			198.9						44.6						170.9						37.9						452.3
Transferred over time where CDW is principal			172.3						15.6						156.8						72.9						417.6
Total Net sales			$	2,255.4					$	433.8					$	2,349.8					$	698.4					$	5,737.4
(1)Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address.
(2)Includes items such as delivery charges to customers.

			Three Months Ended September 30, 2024
			Corporate						Small Business						Public						Other						Total
Geography(1)
United States			$	2,149.4					$	373.0					$	2,333.8					$	6.9					$	4,863.1
Rest of World			11.8						6.7						1.9						633.1						653.5
Total Net sales			$	2,161.2					$	379.7					$	2,335.7					$	640.0					$	5,516.6
Major Product and Services
Hardware			$	1,468.6					$	294.7					$	1,742.8					$	452.5					$	3,958.6
Software			458.4						60.3						427.0						102.6						1,048.3
Services			218.9						20.4						161.0						81.6						481.9
Other(2)			15.3						4.3						4.9						3.3						27.8
Total Net sales			$	2,161.2					$	379.7					$	2,335.7					$	640.0					$	5,516.6
Sales by Channel
Corporate			$	2,161.2					$	—					$	—					$	—					$	2,161.2
Small Business			—						379.7						—						—						379.7
Government			—						—						691.0						—						691.0
Education			—						—						995.7						—						995.7
Healthcare			—						—						649.0						—						649.0
Other			—						—						—						640.0						640.0
Total Net sales			$	2,161.2					$	379.7					$	2,335.7					$	640.0					$	5,516.6
Timing of Revenue Recognition
Transferred at a point in time where CDW is principal			$	1,799.8					$	328.1					$	2,053.4					$	539.7					$	4,721.0
Transferred at a point in time where CDW is agent			197.5						37.0						160.0						33.6						428.1
Transferred over time where CDW is principal			163.9						14.6						122.3						66.7						367.5
Total Net sales			$	2,161.2					$	379.7					$	2,335.7					$	640.0					$	5,516.6
(1)Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address.
(2)Includes items such as delivery charges to customers.

			Nine Months Ended September 30, 2025
			Corporate						Small Business						Public						Other						Total
Geography(1)
United States			$	7,014.7					$	1,250.3					$	6,511.7					$	16.7					$	14,793.4
Rest of World			58.2						19.4						7.9						2,034.2						2,119.7
Total Net sales			$	7,072.9					$	1,269.7					$	6,519.6					$	2,050.9					$	16,913.1
Major Product and Services
Hardware			$	4,875.6					$	994.4					$	4,903.2					$	1,501.6					$	12,274.8
Software			1,460.7						195.8						1,079.5						296.1						3,032.1
Services			689.5						65.8						522.7						242.1						1,520.1
Other(2)			47.1						13.7						14.2						11.1						86.1
Total Net sales			$	7,072.9					$	1,269.7					$	6,519.6					$	2,050.9					$	16,913.1
Sales by Channel
Corporate			$	7,072.9					$	—					$	—					$	—					$	7,072.9
Small Business			—						1,269.7						—						—						1,269.7
Government			—						—						1,939.0						—						1,939.0
Education			—						—						2,470.3						—						2,470.3
Healthcare			—						—						2,110.3						—						2,110.3
Other			—						—						—						2,050.9						2,050.9
Total Net sales			$	7,072.9					$	1,269.7					$	6,519.6					$	2,050.9					$	16,913.1
Timing of Revenue Recognition
Transferred at a point in time where CDW is principal			$	5,928.4					$	1,106.5					$	5,689.3					$	1,722.3					$	14,446.5
Transferred at a point in time where CDW is agent			616.3						116.1						417.0						121.5						1,270.9
Transferred over time where CDW is principal			528.2						47.1						413.3						207.1						1,195.7
Total Net sales			$	7,072.9					$	1,269.7					$	6,519.6					$	2,050.9					$	16,913.1
(1)Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address.
(2)Includes items such as delivery charges to customers.

			Nine Months Ended September 30, 2024
			Corporate						Small Business						Public						Other						Total
Geography(1)
United States			$	6,448.0					$	1,125.9					$	6,298.6					$	20.3					$	13,892.8
Rest of World			44.3						17.6						5.1						1,852.9						1,919.9
Total Net sales			$	6,492.3					$	1,143.5					$	6,303.7					$	1,873.2					$	15,812.7
Major Product and Services
Hardware			$	4,466.4					$	902.0					$	4,855.4					$	1,342.8					$	11,566.6
Software			1,312.1						173.7						992.6						299.9						2,778.3
Services			668.1						54.7						441.6						221.7						1,386.1
Other(2)			45.7						13.1						14.1						8.8						81.7
Total Net sales			$	6,492.3					$	1,143.5					$	6,303.7					$	1,873.2					$	15,812.7
Sales by Channel
Corporate			$	6,492.3					$	—					$	—					$	—					$	6,492.3
Small Business			—						1,143.5						—						—						1,143.5
Government			—						—						1,873.4						—						1,873.4
Education			—						—						2,609.9						—						2,609.9
Healthcare			—						—						1,820.4						—						1,820.4
Other			—						—						—						1,873.2						1,873.2
Total Net sales			$	6,492.3					$	1,143.5					$	6,303.7					$	1,873.2					$	15,812.7
Timing of Revenue Recognition
Transferred at a point in time where CDW is principal			$	5,409.5					$	997.0					$	5,561.3					$	1,593.8					$	13,561.6
Transferred at a point in time where CDW is agent			585.5						110.3						402.7						95.6						1,194.1
Transferred over time where CDW is principal			497.3						36.2						339.7						183.8						1,057.0
Total Net sales			$	6,492.3					$	1,143.5					$	6,303.7					$	1,873.2					$	15,812.7
(1)Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address.
(2)Includes items such as delivery charges to customers.

The following tables present Net sales by major category for the three and nine months ended September 30, 2025 and 2024. Categories are based upon internal classifications.

			Three Months Ended September 30,
			2025												2024
			Net Sales						Percentage of Total Net Sales						Net Sales						Percentage of Total Net Sales
Hardware:
Notebooks/Mobile Devices			$	1,433.2					25.0		%				$	1,370.4					24.8		%
Netcomm Products			735.8						12.8						667.6						12.1
Collaboration			453.3						7.9						460.3						8.3
Data Storage and Servers			469.9						8.2						506.0						9.2
Desktops			343.2						6.0						291.4						5.3
Other Hardware			653.1						11.4						662.9						12.1
Total Hardware			4,088.5						71.3						3,958.6						71.8
Software(1)			1,093.6						19.1						1,048.3						19.0
Services(1)			525.6						9.2						481.9						8.7
Other(2)			29.7						0.4						27.8						0.5
Total Net sales			$	5,737.4					100.0		%				$	5,516.6					100.0		%
			Nine Months Ended September 30,
			2025												2024
			Net Sales						Percentage of Total Net Sales						Net Sales						Percentage of Total Net Sales
Hardware:
Notebooks/Mobile Devices			$	4,358.0					25.8		%				$	3,949.9					25.0		%
Netcomm Products			2,023.3						12.0						1,877.1						11.9
Collaboration			1,323.0						7.8						1,364.9						8.6
Data Storage and Servers			1,631.7						9.6						1,593.2						10.1
Desktops			1,053.3						6.2						845.3						5.3
Other Hardware			1,885.5						11.1						1,936.2						12.2
Total Hardware			12,274.8						72.5						11,566.6						73.1
Software(1)			3,032.1						17.9						2,778.3						17.6
Services(1)			1,520.1						9.0						1,386.1						8.8
Other(2)			86.1						0.6						81.7						0.5
Total Net sales			$	16,913.1					100.0		%				$	15,812.7					100.0		%
(1)Certain software and services revenues are recorded on a net basis as the Company is acting as an agent in the transaction. As a result, the category percentage of net revenues is not representative of the category percentage of gross profits.
(2)Includes items such as delivery charges to customers.

X

- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-25

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

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