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	$ (49.8)
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	(0.2)		(0.2)
Stock-based compensation and vesting of restricted stock, net of withholdings, (in shares)		0.0
Net income	9.0			9.0
Dividends declared	(5.0)			(5.0)
Change in fair value of derivative financial instruments, net of tax	0.3				0.3
Minimum pension adjustment, net of tax	4.4				4.4
Cumulative foreign currency translation adjustment	7.8				7.8
Ending balance at Mar. 31, 2018	413.0	$ 0.0	223.1	227.2	(37.3)
Ending balance (in shares) at Mar. 31, 2018		29.1
Beginning balance at Dec. 31, 2018	1,848.2	$ 64.2	1,687.1	232.6	(71.6)
Beginning balance (in shares) at Dec. 31, 2018		0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	1.4	$ 0.1	1.4
Net income	35.2			35.2
Dividends declared	(11.1)			(11.1)
Change in fair value of derivative financial instruments, net of tax	11.5				11.5
Minimum pension adjustment, net of tax	(0.3)				(0.3)
Cumulative foreign currency translation adjustment	(12.5)				(12.5)
Ending balance at Mar. 31, 2019	$ 1,872.4	$ 64.3	$ 1,688.5	$ 256.7	$ (72.9)
Ending balance (in shares) at Mar. 31, 2019		0.1