Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2018	$ 1,848.2	$ 0.1	$ 1,687.1	$ 232.6	$ (71.6)
Beginning balance (in shares) at Dec. 31, 2018		64.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	4.7		4.7
Stock-based compensation and vesting of restricted stock, net of withholdings, (in shares)		0.1
Net income (loss)	64.2			64.2
Dividends declared	(22.3)			(22.3)
Change in fair value of derivative financial instruments, net of tax	(2.5)				(2.5)
Minimum pension adjustment, net of tax	(0.3)				(0.3)
Cumulative foreign currency translation adjustment	(7.6)				(7.6)
Ending balance at Jun. 30, 2019	1,884.4	$ 0.1	1,691.8	274.5	(82.0)
Ending balance (in shares) at Jun. 30, 2019		64.3
Beginning balance at Mar. 31, 2019	1,872.4	$ 0.1	1,688.5	256.7	(72.9)
Beginning balance (in shares) at Mar. 31, 2019		64.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	3.3		3.3
Net income (loss)	29.0			29.0
Dividends declared	(11.2)			(11.2)
Change in fair value of derivative financial instruments, net of tax	(14.0)				(14.0)
Cumulative foreign currency translation adjustment	4.9				4.9
Ending balance at Jun. 30, 2019	1,884.4	$ 0.1	1,691.8	274.5	(82.0)
Ending balance (in shares) at Jun. 30, 2019		64.3
Beginning balance at Dec. 31, 2019	1,922.3	$ 0.1	1,696.7	315.4	(89.9)
Beginning balance (in shares) at Dec. 31, 2019		64.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	5.1		5.1
Stock-based compensation and vesting of restricted stock, net of withholdings, (in shares)		0.4
Net income (loss)	(95.0)			(95.0)
Dividends declared	(13.7)			(13.7)
Change in fair value of derivative financial instruments, net of tax	19.3				19.3
Non-cash amortization of interest rate swap expense, net of tax	1.7				1.7
Minimum pension adjustment, net of tax	(0.1)				(0.1)
Cumulative foreign currency translation adjustment	(31.1)				(31.1)
Ending balance at Jun. 30, 2020	1,808.5	$ 0.1	1,701.8	206.7	(100.1)
Ending balance (in shares) at Jun. 30, 2020		64.6
Beginning balance at Mar. 31, 2020	1,757.1	$ 0.1	1,698.1	187.7	(128.8)
Beginning balance (in shares) at Mar. 31, 2020		64.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	3.7		3.7
Net income (loss)	21.7			21.7
Dividends declared	(2.7)			(2.7)
Change in fair value of derivative financial instruments, net of tax	(0.2)				(0.2)
Non-cash amortization of interest rate swap expense, net of tax	1.7				1.7
Cumulative foreign currency translation adjustment	27.2				27.2
Ending balance at Jun. 30, 2020	$ 1,808.5	$ 0.1	$ 1,701.8	$ 206.7	$ (100.1)
Ending balance (in shares) at Jun. 30, 2020		64.6