Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in Goodwill by reportable segment are as follows:

	Corporate		Small Business		Public		Other(1)		Consolidated
Balances as of December 31, 2021(2)	$	2,024.4	$	266.1	$	1,737.7	$	354.7	$	4,382.9
Sirius measurement period adjustment(3)	109.0		(35.9)		(78.9)		—		(5.8)
Foreign currency translation	—		—		—		(34.4)		(34.4)
Balances as of December 31, 2022(2)	2,133.4		230.2		1,658.8		320.3		4,342.7
Acquisition activity(4)	19.7		—		36.3		—		56.0
Foreign currency translation	—		—		—		14.7		14.7
Balances as of December 31, 2023(2)	$	2,153.1	$	230.2	$	1,695.1	$	335.0	$	4,413.4

(1)Other is comprised of CDW UK and CDW Canada operating segments.

(2)Goodwill is net of accumulated impairment losses of $1,571 million, $354 million and $28 million related to the Corporate, Public and Other segments, respectively, recorded in 2008 and 2009.

(3)For additional information regarding the Sirius acquisition, see Note 3 (Acquisitions).

(4)Includes other immaterial acquisitions.

Schedule of Finite-Lived Intangible Assets

A summary of intangible assets is as follows:

December 31, 2023	Useful Lives (Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	3 - 14	$	3,379.7	$	(2,236.6)	$	1,143.1
Trade name	1 - 20	446.1		(366.6)		79.5
Internally developed software	3 - 5	474.9		(330.6)		144.3
Other	1 - 10	4.3		(1.5)		2.8
Total		$	4,305.0	$	(2,935.3)	$	1,369.7
December 31, 2022	Useful Lives (Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	3 - 14	$	3,352.4	$	(2,100.6)	$	1,251.8
Trade name	1 - 20	446.1		(341.0)		105.1
Internally developed software	3 - 5	429.8		(297.6)		132.2
Other	1 - 10	2.5		(0.9)		1.6
Total		$	4,230.8	$	(2,740.1)	$	1,490.7

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Estimated future amortization expense related to intangible assets is as follows:

Years ending December 31,	Estimated Future Amortization Expense
2024	$	212.8
2025	197.2
2026	179.6
2027	152.3
2028	123.0
Thereafter	504.8
Total future amortization expense	$	1,369.7