Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	$0.001 Par Value Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings
Balance (in shares) at Dec. 31, 2020		54,300,000		1,200,000
Beginning balance at Dec. 31, 2020	$ 1,447.0	$ 0.1	$ 784.9	$ (39.6)	$ (25.3)	$ 726.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation activity (in shares)		500,000
Share-based compensation activity	5.2		5.2
Net income (loss)	69.7					69.7
Other comprehensive income (loss), net of tax	0.9				0.9
Balance (in shares) at Mar. 31, 2021		54,800,000		1,200,000
Ending balance at Mar. 31, 2021	$ 1,522.8	$ 0.1	790.1	$ (39.6)	(24.4)	796.6
Balance (in shares) at Dec. 31, 2021	55,100,000	55,100,000		3,800,000
Beginning balance at Dec. 31, 2021	$ 1,619.0	$ 0.1	829.4	$ (152.2)	(16.1)	957.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation activity (in shares)		200,000
Share-based compensation activity	5.4		5.4
Net income (loss)	(3.7)					(3.7)
Repurchases of stock (in shares)				(1,100,000)
Repurchases of stock	(52.2)			$ (52.2)
Other comprehensive income (loss), net of tax	$ 6.8				6.8
Balance (in shares) at Mar. 31, 2022	55,300,000	55,300,000		4,900,000
Ending balance at Mar. 31, 2022	$ 1,575.3	$ 0.1	$ 834.8	$ (204.4)	$ (9.3)	$ 954.1