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, 2020	$ 3,610.8	$ 89.9	$ 3,491.4	$ 844.3	$ (96.5)	$ (718.3)
Shareholders' Equity [Roll Forward]
Net income	409.6			409.6
Other comprehensive loss	(45.5)					(45.5)
Treasury stock purchased	(775.4)				(775.4)
Stock-based compensation activity	30.3	0.3	51.5		(21.5)
Other adjustments	0.7		0.7
Cash dividends	(151.8)			(151.8)
Ending balance at Mar. 31, 2021	3,078.7	90.2	3,543.6	1,102.1	(893.4)	(763.8)
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	1,058.2
Other comprehensive loss	17.1
Ending balance at Jun. 30, 2021	2,840.4	90.6	3,608.1	1,604.8	(1,761.9)	(701.2)
Beginning balance at Mar. 31, 2021	3,078.7	90.2	3,543.6	1,102.1	(893.4)	(763.8)
Shareholders' Equity [Roll Forward]
Net income	648.6			648.6
Other comprehensive loss	62.6					62.6
Treasury stock purchased	(870.1)				(870.1)
Treasury stock issued	11.7		9.3		2.4
Stock-based compensation activity	54.2	0.4	54.6		(0.8)
Other adjustments	0.6		0.6
Cash dividends	(145.9)			(145.9)
Ending balance at Jun. 30, 2021	2,840.4	90.6	3,608.1	1,604.8	(1,761.9)	(701.2)
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 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	948.7
Other comprehensive loss	(216.2)
Ending balance at Jun. 30, 2022	2,224.6	91.0	3,880.3	2,763.3	(3,595.4)	(914.6)
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 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)