Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2020		259.9
Beginning balance at Dec. 31, 2020	$ 8,686.8	$ 2.6	$ 7,894.0	$ (68.5)	$ 858.7
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), net of tax	35.2			35.2
Net income	653.1				653.1
Repurchase of common stock (in shares)		(2.0)
Repurchase of common stock	(424.9)	$ 0.0	(424.9)
Common stock withheld for employee tax obligations (in shares)		(0.5)
Common stock withheld for employee tax obligations	(102.1)	$ 0.0	(102.1)
Issuance of common stock under benefit plans (in shares)		1.4
Issuance of common stock under benefit plans	15.2	$ 0.0	15.2
Stock-based compensation expense	117.0		117.0
Ending balance (in shares) at Mar. 31, 2021		258.8
Ending balance at Mar. 31, 2021	8,980.3	$ 2.6	7,499.2	(33.3)	1,511.8
Beginning balance (in shares) at Dec. 31, 2021		254.5
Beginning balance at Dec. 31, 2021	10,100.0	$ 2.5	6,880.8	15.9	3,200.8
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), net of tax	(4.6)			(4.6)
Net income	762.1				762.1
Common stock withheld for employee tax obligations (in shares)		(0.5)
Common stock withheld for employee tax obligations	(117.5)	$ 0.0	(117.5)
Issuance of common stock under benefit plans (in shares)		1.6
Issuance of common stock under benefit plans	36.5	$ 0.1	36.4
Stock-based compensation expense	130.5		130.5
Ending balance (in shares) at Mar. 31, 2022		255.6
Ending balance at Mar. 31, 2022	$ 10,907.0	$ 2.6	$ 6,930.2	$ 11.3	$ 3,962.9