Consolidated Statement of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		141.9
Beginning balance at Dec. 31, 2020	$ 1,297.1	$ 1.4	$ 3,204.9	$ (1,813.4)	$ (95.8)	$ 19.2	$ 19.2
Shareholders' Equity (Deficit) [Roll Forward]
Net income	232.6			232.6
Equity-based compensation expense	15.8		15.8
Stock option exercises (in shares)		0.9
Stock option exercises	37.7		37.7
Coworker Stock Purchase Plan	3.9		3.9
Repurchases of common stock (in shares)		(2.4)
Repurchases of common stock	(358.4)			(358.4)
Dividends paid	(56.5)		0.3	(56.8)
Incentive compensation plan stock withheld for taxes	(27.8)			(27.8)
Unrealized gain from cash flow hedge, net of tax	0.0
Reclassification of hedge accounting loss to net income	0.4				0.4
Foreign currency translation	6.3				6.3
Ending balance (in shares) at Mar. 31, 2021		140.4
Ending balance at Mar. 31, 2021	1,170.3	$ 1.4	3,262.6	(2,004.6)	(89.1)
Beginning balance (in shares) at Dec. 31, 2021		134.8
Beginning balance at Dec. 31, 2021	705.7	$ 1.3	3,369.5	(2,570.7)	(94.4)
Shareholders' Equity (Deficit) [Roll Forward]
Net income	250.2			250.2
Equity-based compensation expense	21.1		21.1
Stock option exercises (in shares)		0.3
Stock option exercises	8.3	$ 0.1	8.2
Coworker Stock Purchase Plan	4.4		4.4
Dividends paid	(67.5)		0.5	(68.0)
Incentive compensation plan stock withheld for taxes	(20.4)			(20.4)
Unrealized gain from cash flow hedge, net of tax	0.4				0.4
Reclassification of hedge accounting loss to net income	0.8				0.8
Foreign currency translation	(9.9)				(9.9)
Ending balance (in shares) at Mar. 31, 2022		135.1
Ending balance at Mar. 31, 2022	$ 893.1	$ 1.4	$ 3,403.7	$ (2,408.9)	$ (103.1)