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, 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)