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	5.5		5.5
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	115.4			115.4
Dividends declared	(14.4)			(14.4)
Total comprehensive loss, net of tax	(37.0)				(37.0)
Ending balance at Sep. 30, 2021	2,068.4	$ 0.1	1,713.7	370.5	(15.9)
Ending balance (in shares) at Sep. 30, 2021		64.9
Beginning balance at Jun. 30, 2021	2,056.7	$ 0.1	1,712.6	340.3	3.7
Beginning balance (in shares) at Jun. 30, 2021		64.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	1.1		1.1
Net income	35.4			35.4
Dividends declared	(5.2)			(5.2)
Total comprehensive loss, net of tax	(19.6)				(19.6)
Ending balance at Sep. 30, 2021	2,068.4	$ 0.1	1,713.7	370.5	(15.9)
Ending balance (in shares) at Sep. 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	6.0		6.0
Stock-based compensation and vesting of restricted stock, net of withholdings (in shares)		0.3
Net income	104.7			104.7
Dividends declared	(17.0)			(17.0)
Total comprehensive loss, net of tax	(173.3)				(173.3)
Ending balance at Sep. 30, 2022	1,905.5	$ 0.1	1,724.4	365.3	(184.3)
Ending balance (in shares) at Sep. 30, 2022		65.2
Beginning balance at Jun. 30, 2022	1,944.3	$ 0.1	1,722.5	337.5	(115.8)
Beginning balance (in shares) at Jun. 30, 2022		65.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	1.9		1.9
Stock-based compensation and vesting of restricted stock, net of withholdings (in shares)		0.1
Net income	33.6			33.6
Dividends declared	(5.8)			(5.8)
Total comprehensive loss, net of tax	(68.5)				(68.5)
Ending balance at Sep. 30, 2022	$ 1,905.5	$ 0.1	$ 1,724.4	$ 365.3	$ (184.3)
Ending balance (in shares) at Sep. 30, 2022		65.2