STATEMENTS OF CONSOLIDATED SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common Stock	Other Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning 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	370.8			370.8
Other comprehensive income (loss)	(43.6)					(43.6)
Treasury stock purchased	(407.1)				(407.1)
Treasury stock issued	22.0		11.0		11.0
Stock-based compensation activity	5.6	0.2	38.3		(32.9)
Other adjustments	0.3		0.4	(0.1)
Cash dividends	(150.9)			(150.9)
Ending balance at Mar. 31, 2022	2,234.3	91.0	3,842.7	2,341.5	(3,298.9)	(742.0)
Beginning 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	1,633.8
Other comprehensive income (loss)	(364.1)
Ending balance at Sep. 30, 2022	2,597.8	91.1	3,919.6	3,292.6	(3,643.0)	(1,062.5)
Beginning balance at Mar. 31, 2022	2,234.3	91.0	3,842.7	2,341.5	(3,298.9)	(742.0)
Shareholders' Equity [Roll Forward]
Net income	577.9			577.9
Other comprehensive income (loss)	(172.6)					(172.6)
Treasury stock purchased	(296.4)				(296.4)
Stock-based compensation activity	41.5		41.5
Other adjustments	(3.9)		(3.9)	0.1	(0.1)
Cash dividends	(156.2)			(156.2)
Ending balance at Jun. 30, 2022	2,224.6	91.0	3,880.3	2,763.3	(3,595.4)	(914.6)
Shareholders' Equity [Roll Forward]
Net income	685.1			685.1
Other comprehensive income (loss)	(147.9)					(147.9)
Treasury stock purchased	(47.6)				(47.6)
Stock-based compensation activity	39.0	0.1	39.0		(0.1)
Other adjustments	0.4		0.3		0.1
Cash dividends	(155.8)			(155.8)
Ending balance at Sep. 30, 2022	2,597.8	91.1	3,919.6	3,292.6	(3,643.0)	(1,062.5)
Beginning 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	477.4			477.4
Other comprehensive income (loss)	34.8					34.8
Treasury stock purchased	(301.7)				(301.7)
Stock-based compensation activity	10.4	0.1	33.8		(23.5)
Other adjustments	0.3		0.3
Cash dividends	(156.5)			(156.5)
Ending balance at Mar. 31, 2023	3,166.8	91.3	3,998.0	3,844.1	(4,100.8)	(665.8)
Beginning 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	2,032.6
Other comprehensive income (loss)	(55.8)
Ending balance at Sep. 30, 2023	3,780.0	91.7	4,103.9	5,087.4	(4,746.6)	(756.4)
Beginning balance at Mar. 31, 2023	3,166.8	91.3	3,998.0	3,844.1	(4,100.8)	(665.8)
Shareholders' Equity [Roll Forward]
Net income	793.7			793.7
Other comprehensive income (loss)	14.5					14.5
Treasury stock purchased	(234.2)				(234.2)
Stock-based compensation activity	47.5	0.1	47.5		(0.1)
Other adjustments	(0.9)		(0.9)
Cash dividends	(156.3)			(156.3)
Ending balance at Jun. 30, 2023	3,631.1	91.4	4,044.6	4,481.5	(4,335.1)	(651.3)
Shareholders' Equity [Roll Forward]
Net income	761.5			761.5
Other comprehensive income (loss)	(105.1)					(105.1)
Treasury stock purchased	(410.1)				(410.1)
Stock-based compensation activity	57.6	0.3	58.7		(1.4)
Other adjustments	0.6		0.6
Cash dividends	(155.6)			(155.6)
Ending balance at Sep. 30, 2023	$ 3,780.0	$ 91.7	$ 4,103.9	$ 5,087.4	$ (4,746.6)	$ (756.4)