Consolidated Statements of Shareholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2018			255.2
Beginning balance at Dec. 31, 2018	$ 4,435.2	$ (40.3)	$ 2.5	$ 7,421.5	$ 0.7	$ (2,989.5)	$ (40.3)
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), net of tax	(2.7)				(2.7)
Net income	1,176.8					1,176.8
Repurchases of common stock (in shares)			(1.0)
Repurchases of common stock	(186.0)			(186.0)
Common stock withheld for employee tax obligations	(6.0)			(6.0)
Issuance of common stock under benefit plans (in shares)			4.8
Issuance of common stock under benefit plans	346.0		$ 0.1	345.9
Stock-based compensation expense	362.2			362.2
Ending balance (in shares) at Dec. 31, 2019			259.0
Ending balance at Dec. 31, 2019	6,085.2		$ 2.6	7,937.6	(2.0)	(1,853.0)
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), net of tax	(66.5)				(66.5)
Net income	2,711.7					2,711.7
Repurchases of common stock (in shares)			(2.4)
Repurchases of common stock	(539.1)			(539.1)
Common stock withheld for employee tax obligations (in shares)			(0.8)
Common stock withheld for employee tax obligations	(200.3)			(200.3)
Issuance of common stock under benefit plans (in shares)			4.1
Issuance of common stock under benefit plans	262.7			262.7
Stock-based compensation expense	433.1			433.1
Ending balance (in shares) at Dec. 31, 2020			259.9
Ending 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	84.4				84.4
Net income	2,342.1					2,342.1
Repurchases of common stock (in shares)			(7.3)
Repurchases of common stock	(1,425.4)		$ (0.1)	(1,425.3)
Common stock withheld for employee tax obligations (in shares)			(0.6)
Common stock withheld for employee tax obligations	(135.9)			(135.9)
Issuance of common stock under benefit plans (in shares)			2.5
Issuance of common stock under benefit plans	102.5			102.5
Stock-based compensation expense	445.5			445.5
Ending balance (in shares) at Dec. 31, 2021			254.5
Ending balance at Dec. 31, 2021	$ 10,100.0		$ 2.5	$ 6,880.8	$ 15.9	$ 3,200.8