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	4.4		4.4
Stock-based compensation and vesting of restricted stock, net of withholdings (in shares)		0.1
Issuance of common stock upon exercise of options	2.2		2.2
Issuance of common stock upon exercise of options (in shares)		0.1
Net income	80.0			80.0
Dividends declared	(9.2)			(9.2)
Total comprehensive loss, net of tax	(17.4)				(17.4)
Ending balance at Jun. 30, 2021	2,056.7	$ 0.1	1,712.6	340.3	3.7
Ending balance (in shares) at Jun. 30, 2021		64.9
Beginning balance at Mar. 31, 2021	1,991.8	$ 0.1	1,706.4	304.8	(19.5)
Beginning balance (in shares) at Mar. 31, 2021		64.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	4.0		4.0
Issuance of common stock upon exercise of options	2.2		2.2
Issuance of common stock upon exercise of options (in shares)		0.1
Net income	40.8			40.8
Dividends declared	(5.3)			(5.3)
Total comprehensive loss, net of tax	23.2				23.2
Ending balance at Jun. 30, 2021	2,056.7	$ 0.1	1,712.6	340.3	3.7
Ending balance (in shares) at Jun. 30, 2021		64.9
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	4.1		4.1
Stock-based compensation and vesting of restricted stock, net of withholdings (in shares)		0.2
Net income	71.1			71.1
Dividends declared	(11.2)			(11.2)
Total comprehensive loss, net of tax	(104.8)				(104.8)
Ending balance at Jun. 30, 2022	1,944.3	$ 0.1	1,722.5	337.5	(115.8)
Ending balance (in shares) at Jun. 30, 2022		65.1
Beginning balance at Mar. 31, 2022	2,007.0	$ 0.1	1,718.2	317.2	(28.5)
Beginning balance (in shares) at Mar. 31, 2022		65.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	4.3		4.3
Net income	26.3			26.3
Dividends declared	(6.0)			(6.0)
Total comprehensive loss, net of tax	(87.3)				(87.3)
Ending balance at Jun. 30, 2022	$ 1,944.3	$ 0.1	$ 1,722.5	$ 337.5	$ (115.8)
Ending balance (in shares) at Jun. 30, 2022		65.1