Statements of Consolidated Shareholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Other Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2019	$ 4,123.3	$ (3.0)	$ 119.4	$ 3,153.0	$ 7,366.9	$ (3.0)	$ (5,836.5)	$ (679.5)
Shareholders' Equity [Roll Forward]
Net income	2,030.4				2,030.4
Other comprehensive (loss) income	(38.8)							(38.8)
Treasury stock purchased	(2,446.3)						(2,446.3)
Treasury stock issued	182.4			61.6			120.8
Treasury stock retired	0.0		(30.6)		(8,061.6)		8,092.2
Stock-based compensation activity	250.8		1.1	276.4			(26.7)
Other adjustments	0.0			0.4	(0.4)
Cash dividends	(488.0)				(488.0)
Ending balance at Dec. 31, 2020	3,610.8		89.9	3,491.4	844.3		(96.5)	(718.3)
Shareholders' Equity [Roll Forward]
Net income	1,864.4				1,864.4
Other comprehensive (loss) income	19.9							19.9
Treasury stock purchased	(2,752.3)						(2,752.3)
Treasury stock issued	11.7			9.3			2.4
Stock-based compensation activity	268.3		0.9	290.9			(23.5)
Other adjustments	1.5			1.4	0.1
Cash dividends	(587.1)				(587.1)
Ending balance at Dec. 31, 2021	2,437.2		90.8	3,793.0	2,121.7		(2,869.9)	(698.4)
Shareholders' Equity [Roll Forward]
Net income	2,020.1				2,020.1
Other comprehensive (loss) income	(2.2)							(2.2)
Treasury stock purchased	(883.2)						(883.2)
Treasury stock issued	22.0			11.0			11.0
Stock-based compensation activity	134.0		0.4	167.1			(33.5)
Other adjustments	(7.3)			(7.2)	(0.1)
Cash dividends	(618.5)				(618.5)
Ending balance at Dec. 31, 2022	$ 3,102.1		$ 91.2	$ 3,963.9	$ 3,523.2		$ (3,775.6)	$ (700.6)