Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Carrying Value of Long-Term Debt

		As of December 31, 2018					As of December 31, 2017
(dollars in millions)	Maturities	Interest Rate		Amount			Interest Rate		Amount
Credit Facilities
CDW UK revolving credit facility(1)	July 2021	—	%	$	—		—	%	$	—
Senior secured asset-based revolving credit facility	March 2022	—	%	—			—	%	—
Total credit facilities				—					—
Term Loans
CDW UK term loan(1)	August 2021	2.3	%	65.0			1.9	%	75.7
Senior secured term loan facility	August 2023	4.1	%	1,453.2			3.7	%	1,468.0
Total term loans				1,518.2					1,543.7
Unsecured Senior Notes
Senior notes due 2023	September 2023	5.0	%	525.0			5.0	%	525.0
Senior notes due 2024	December 2024	5.5	%	575.0			5.5	%	575.0
Senior notes due 2025	September 2025	5.0	%	600.0			5.0	%	600.0
Total unsecured senior notes				1,700.0					1,700.0
Other long-term obligations				8.3					12.2
Unamortized deferred financing fees				(17.9		)			(20.4		)
Current maturities of long-term debt				(25.3		)			(25.5		)
Total long-term debt				$	3,183.3				$	3,210.0

(1)

British pound-denominated debt facilities.

Schedule of Long-term Debt Maturities

A summary of total debt maturities is as follows:    

(in millions)
Years ending December 31,	Total
2019	$	25.3
2020	25.5
2021	67.2
2022	14.9
2023	1,918.6
Thereafter	1,175.0
	$	3,226.5

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The approximate fair values and related carrying values of the Company's long-term debt, including current maturities and excluding unamortized discount and unamortized deferred financing costs, were as follows:

	December 31,
(in millions)	2018		2017
Fair value	$	3,145.8	$	3,366.5
Carrying value	3,226.5		3,255.9