Statements of Consolidated Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Other Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning 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 income (loss)	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 income (loss)	(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)
Shareholders' Equity [Roll Forward]
Net income	2,388.8			2,388.8
Other comprehensive income (loss)	76.3					76.3
Treasury stock purchased	(1,432.0)				(1,432.0)
Stock-based compensation activity	203.9	0.6	229.3		(26.0)
Other adjustments	0.4		0.4
Cash dividends	(623.7)			(623.7)
Ending balance at Dec. 31, 2023	$ 3,715.8	$ 91.8	$ 4,193.6	$ 5,288.3	$ (5,233.6)	$ (624.3)