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, 2017	$ 396.7	$ 0.0	$ 223.3	$ 223.2	$ (49.9)
Beginning balance (in shares) at Dec. 31, 2017		29.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	1.0		1.0
Stock-based compensation and vesting of restricted stock, net of withholdings, (in shares)		0.1
Net income	40.3			40.3
Dividends declared	(15.0)			(15.0)
Change in fair value of derivative financial instruments, net of tax	0.9				0.9
Minimum pension adjustment, net of tax	4.4				4.4
Cumulative foreign currency translation adjustment	(11.1)				(11.1)
Ending balance at Jun. 30, 2018	417.2	$ 0.0	224.3	248.5	(55.7)
Ending balance (in shares) at Jun. 30, 2018		29.2
Beginning balance at Dec. 31, 2017	396.7	$ 0.0	223.3	223.2	(49.9)
Beginning balance (in shares) at Dec. 31, 2017		29.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40.3
Cumulative foreign currency translation adjustment	(11.2)
Ending balance at Sep. 30, 2018					(55.8)
Beginning balance at Mar. 31, 2018	412.9	$ 0.0	224.5	241.2	(52.9)
Beginning balance (in shares) at Mar. 31, 2018		29.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	(0.2)		(0.2)
Stock-based compensation and vesting of restricted stock, net of withholdings, (in shares)		0.1
Net income	12.3			12.3
Dividends declared	(5.0)			(5.0)
Minimum pension adjustment, net of tax	(0.2)				(0.2)
Cumulative foreign currency translation adjustment	(2.6)				(2.6)
Ending balance at Jun. 30, 2018	417.2	$ 0.0	224.3	248.5	(55.7)
Ending balance (in shares) at Jun. 30, 2018		29.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12.3
Cumulative foreign currency translation adjustment	(2.6)
Ending balance at Sep. 30, 2018					(55.8)
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	6.2		6.2
Stock-based compensation and vesting of restricted stock, net of withholdings, (in shares)		0.3
Net income	89.9			89.9
Dividends declared	(33.2)			(33.2)
Change in fair value of derivative financial instruments, net of tax	23.0				23.0
Minimum pension adjustment, net of tax	(0.3)				(0.3)
Cumulative foreign currency translation adjustment	(66.3)				(66.3)
Ending balance at Sep. 30, 2019	1,867.5	$ 0.1	1,693.3	289.3	(115.2)
Ending balance (in shares) at Sep. 30, 2019		64.5
Beginning balance at Jun. 30, 2019	1,884.4	$ 0.1	1,691.8	274.5	(82.0)
Beginning balance (in shares) at Jun. 30, 2019		64.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	1.5		1.5
Stock-based compensation and vesting of restricted stock, net of withholdings, (in shares)		0.2
Net income	25.7			25.7
Dividends declared	(10.9)			(10.9)
Change in fair value of derivative financial instruments, net of tax	25.5				25.5
Cumulative foreign currency translation adjustment	(58.7)				(58.7)
Ending balance at Sep. 30, 2019	$ 1,867.5	$ 0.1	$ 1,693.3	$ 289.3	$ (115.2)
Ending balance (in shares) at Sep. 30, 2019		64.5