Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by reportable segment are as follows:


	Corporate		Small Business		Public		Other(1)		Consolidated
Balances as of December 31, 2018(2)	$	1,074.1	$	185.9	$	929.6	$	273.2	$	2,462.8
Scalar acquisition(3)	—		—		—		62.0		62.0
Aptris, Inc. acquisition(4)	16.5		—		—		—		16.5
Foreign currency translation	—		—		—		11.7		11.7
Balances as of December 31, 2019(2)	1,090.6		185.9		929.6		346.9		2,553.0
IGNW, Inc. acquisition(5)	33.0		—		—		—		33.0
Foreign currency translation	—		—		—		9.9		9.9
Balances as of December 31, 2020(2)	$	1,123.6	$	185.9	$	929.6	$	356.8	$	2,595.9

(1)Other is comprised of CDW UK and CDW Canada reporting units.

(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.

(3)For additional information regarding the addition to goodwill resulting from the Company's acquisition, see Note 3 (Acquisition).

(4)The Company acquired Aptris, Inc. on October 1, 2019.

(5)The Company acquired IGNW, Inc. on July 1, 2020.

Schedule of Finite-Lived Intangible Assets

A summary of intangible assets is as follows:


December 31, 2020	Useful Lives (Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships and contracts	3 - 14	$	2,131.5	$	(1,927.9)	$	203.6
Trade name	generally 20	422.8		(280.1)		142.7
Internally developed software	3 - 5	280.6		(186.0)		94.6
Other	1 - 10	9.6		(5.4)		4.2
Total		$	2,844.5	$	(2,399.4)	$	445.1


December 31, 2019
Customer relationships and contracts	3 - 14	$	2,111.2	$	(1,786.4)	$	324.8
Trade name	generally 20	422.8		(259.0)		163.8
Internally developed software	3 - 5	263.5		(160.0)		103.5
Other	1 - 10	5.5		(3.5)		2.0
Total		$	2,803.0	$	(2,208.9)	$	594.1

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
2021	$	126.4
2022	77.1
2023	57.5
2024	43.0
2025	42.9
Thereafter	98.2
Total future amortization expense	$	445.1