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, 2020	$ 1,996.7	$ 0.1	$ 1,706.0	$ 269.5	$ 21.1
Beginning balance (in shares) at Dec. 31, 2020		64.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	0.4		0.4
Stock-based compensation and vesting of restricted stock, net of withholdings (in shares)		0.1
Net income	39.2			39.2
Dividends declared	(3.9)			(3.9)
Total comprehensive loss, net of tax	(40.6)				(40.6)
Ending balance at Mar. 31, 2021	1,991.8	$ 0.1	1,706.4	304.8	(19.5)
Ending balance (in shares) at Mar. 31, 2021		64.8
Beginning balance at Dec. 31, 2021	1,985.1	$ 0.1	1,718.4	277.6	(11.0)
Beginning balance (in shares) at Dec. 31, 2021		64.9
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)		0.2
Net income	44.8			44.8
Dividends declared	(5.2)			(5.2)
Total comprehensive loss, net of tax	(17.5)				(17.5)
Ending balance at Mar. 31, 2022	$ 2,007.0	$ 0.1	$ 1,718.2	$ 317.2	$ (28.5)
Ending balance (in shares) at Mar. 31, 2022		65.1