Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Paid-in Capital	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2020			141,900,000
Beginning balance at Dec. 31, 2020	$ 1,297.1	$ 19.2	$ 1.4	$ 3,204.9	$ (1,813.4)	$ 19.2	$ (95.8)
Shareholders' Equity (Deficit) [Roll Forward]
Net income	773.3				773.3
Equity-based compensation expense	53.3			53.3
Stock option exercises (in shares)			1,200,000
Stock option exercises	60.7			60.7
Coworker Stock Purchase Plan (in shares)			100,000
Coworker Stock Purchase Plan	15.9			15.9
Repurchases of common stock (in shares)			(7,000,000.0)
Repurchases of common stock	(1,185.3)				(1,185.3)
Dividends paid	(167.1)			0.9	(168.0)
Incentive compensation plan stock withheld for taxes	(28.4)				(28.4)
Unrealized gain from cash flow hedge, net of tax	0.0
Reclassification of cash flow hedge loss to net income	1.7						1.7
Foreign currency translation	(3.4)						(3.4)
Ending balance (in shares) at Sep. 30, 2021			136,200,000
Ending balance at Sep. 30, 2021	837.0		$ 1.4	3,335.7	(2,402.6)		(97.5)
Beginning balance (in shares) at Jun. 30, 2021			138,300,000
Beginning balance at Jun. 30, 2021	1,048.8		$ 1.4	3,294.1	(2,163.5)		(83.2)
Shareholders' Equity (Deficit) [Roll Forward]
Net income	266.6				266.6
Equity-based compensation expense	16.9			16.9
Stock option exercises (in shares)			300,000
Stock option exercises	18.9			18.9
Coworker Stock Purchase Plan (in shares)			0
Coworker Stock Purchase Plan	5.5			5.5
Repurchases of common stock (in shares)			(2,400,000)
Repurchases of common stock	(450.0)		$ 0.0		(450.0)
Dividends paid	(54.8)			0.3	(55.1)
Incentive compensation plan stock withheld for taxes	(0.6)				(0.6)
Unrealized gain from cash flow hedge, net of tax	0.0
Reclassification of cash flow hedge loss to net income	0.7						0.7
Foreign currency translation	(15.0)						(15.0)
Ending balance (in shares) at Sep. 30, 2021			136,200,000
Ending balance at Sep. 30, 2021	837.0		$ 1.4	3,335.7	(2,402.6)		(97.5)
Beginning balance (in shares) at Dec. 31, 2021			134,800,000
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	827.3				827.3
Equity-based compensation expense	71.4			71.4
Stock option exercises (in shares)			400,000
Stock option exercises	20.7		$ 0.1	20.6
Coworker Stock Purchase Plan (in shares)			100,000
Coworker Stock Purchase Plan	18.7			18.7
Dividends paid	(202.7)			1.3	(204.0)
Incentive compensation plan stock withheld for taxes	(21.9)				(21.9)
Unrealized gain from cash flow hedge, net of tax	2.1						2.1
Reclassification of cash flow hedge loss to net income	2.6						2.6
Foreign currency translation	(97.9)						(97.9)
Ending balance (in shares) at Sep. 30, 2022			135,300,000
Ending balance at Sep. 30, 2022	1,326.0		$ 1.4	3,481.5	(1,969.3)		(187.6)
Beginning balance (in shares) at Jun. 30, 2022			135,200,000
Beginning balance at Jun. 30, 2022	1,106.2		$ 1.4	3,441.8	(2,197.7)		(139.3)
Shareholders' Equity (Deficit) [Roll Forward]
Net income	297.8				297.8
Equity-based compensation expense	26.8			26.8
Stock option exercises (in shares)			100,000
Stock option exercises	5.6			5.6
Coworker Stock Purchase Plan (in shares)			0
Coworker Stock Purchase Plan	6.9			6.9
Dividends paid	(67.7)			0.4	(68.1)
Incentive compensation plan stock withheld for taxes	(1.3)				(1.3)
Unrealized gain from cash flow hedge, net of tax	0.7						0.7
Reclassification of cash flow hedge loss to net income	1.0						1.0
Foreign currency translation	(50.0)						(50.0)
Ending balance (in shares) at Sep. 30, 2022			135,300,000
Ending balance at Sep. 30, 2022	$ 1,326.0		$ 1.4	$ 3,481.5	$ (1,969.3)		$ (187.6)