Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2022		257,000,000.0
Beginning balance at Dec. 31, 2022	$ 13,912.7	$ 2.6	$ 7,386.5	$ 0.8	$ 6,522.8
Increase (Decrease) in Stockholders' Equity
Other comprehensive (loss) income, net of tax	(13.9)			(13.9)
Net income	$ 699.8				699.8
Repurchase of common stock (in shares)	(459,017)	(500,000)
Repurchases of common stock	$ (135.6)	$ (0.0)	(135.6)
Common stock withheld for employee tax obligations (in shares)		(600,000)
Common stock withheld for employee tax obligations	(166.6)	$ (0.0)	(166.6)
Issuance of common stock under benefit plans (in shares)		1,600,000
Issuance of common stock under benefit plans	13.1	$ 0.0	13.1
Stock-based compensation expense	122.8		122.8
Ending balance (in shares) at Mar. 31, 2023		257,500,000
Ending balance at Mar. 31, 2023	$ 14,432.3	$ 2.6	7,220.2	(13.1)	7,222.6
Beginning balance (in shares) at Dec. 31, 2023	257,695,221	257,700,000
Beginning balance at Dec. 31, 2023	$ 17,580.4	$ 2.6	7,449.7	(14.3)	10,142.4
Increase (Decrease) in Stockholders' Equity
Other comprehensive (loss) income, net of tax	31.6			31.6
Net income	$ 1,099.6				1,099.6
Repurchase of common stock (in shares)	(335,773)	(300,000)
Repurchases of common stock	$ (140.4)	$ (0.0)	(140.4)
Common stock withheld for employee tax obligations (in shares)		(600,000)
Common stock withheld for employee tax obligations	(233.5)	$ (0.0)	(233.5)
Issuance of common stock under benefit plans (in shares)		1,500,000
Issuance of common stock under benefit plans	15.9	$ 0.0	15.9
Stock-based compensation expense	$ 193.0		193.0
Ending balance (in shares) at Mar. 31, 2024	258,296,249	258,300,000
Ending balance at Mar. 31, 2024	$ 18,546.6	$ 2.6	$ 7,284.7	$ 17.3	$ 11,242.0