Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	$0.001 Par Value Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2020		54,300,000
Beginning balance at Dec. 31, 2020	$ 1,447.0	$ 0.1	$ (39.6)	$ 784.9	$ (25.3)	$ 726.9
Beginning balance (in shares) at Dec. 31, 2020			(1,200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation activity (in shares)		600,000
Share-based compensation activity	31.9			31.9
Net income (loss)	41.6					41.6
Other comprehensive income (loss), net of tax	2.2				2.2
Ending balance (in shares) at Sep. 30, 2021		54,900,000
Ending balance (in shares) at Sep. 30, 2021			(1,200,000)
Ending balance at Sep. 30, 2021	1,522.7	$ 0.1	$ (39.6)	816.8	(23.1)	768.5
Beginning balance (in shares) at Jun. 30, 2021		54,900,000
Beginning balance at Jun. 30, 2021	1,543.7	$ 0.1	$ (39.6)	804.4	(22.4)	801.2
Beginning balance (in shares) at Jun. 30, 2021			(1,200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation activity	12.4			12.4
Net income (loss)	(32.7)					(32.7)
Other comprehensive income (loss), net of tax	(0.7)				(0.7)
Ending balance (in shares) at Sep. 30, 2021		54,900,000
Ending balance (in shares) at Sep. 30, 2021			(1,200,000)
Ending balance at Sep. 30, 2021	$ 1,522.7	$ 0.1	$ (39.6)	816.8	(23.1)	768.5
Beginning balance (in shares) at Dec. 31, 2021	51,300,000	55,100,000
Beginning balance at Dec. 31, 2021	$ 1,619.0	$ 0.1	$ (152.2)	829.4	(16.1)	957.8
Beginning balance (in shares) at Dec. 31, 2021			(3,800,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation activity (in shares)		400,000
Share-based compensation activity	30.7			30.7
Net income (loss)	(135.8)					(135.8)
Repurchases of stock (in shares)			(1,800,000)
Repurchases of stock	(75.5)		$ (75.5)
Other comprehensive income (loss), net of tax	$ 10.9				10.9
Ending balance (in shares) at Sep. 30, 2022	49,900,000	55,500,000
Ending balance (in shares) at Sep. 30, 2022			(5,600,000)
Ending balance at Sep. 30, 2022	$ 1,449.3	$ 0.1	$ (227.7)	860.1	(5.2)	822.0
Beginning balance (in shares) at Jun. 30, 2022		55,500,000
Beginning balance at Jun. 30, 2022	1,513.2	$ 0.1	$ (227.7)	849.2	(6.1)	897.7
Beginning balance (in shares) at Jun. 30, 2022			(5,600,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation activity	10.9			10.9
Net income (loss)	(75.7)					(75.7)
Repurchases of stock (in shares)			0
Repurchases of stock	0.0
Other comprehensive income (loss), net of tax	$ 0.9				0.9
Ending balance (in shares) at Sep. 30, 2022	49,900,000	55,500,000
Ending balance (in shares) at Sep. 30, 2022			(5,600,000)
Ending balance at Sep. 30, 2022	$ 1,449.3	$ 0.1	$ (227.7)	$ 860.1	$ (5.2)	$ 822.0