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, 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, 2023	3,715.8	91.8	4,193.6	5,288.3	(5,233.6)	(624.3)
Shareholders' Equity [Roll Forward]
Net income	505.2			505.2
Other comprehensive income (loss)	(80.7)					(80.7)
Treasury stock purchased	(545.5)				(545.5)
Stock-based compensation activity	90.5	0.2	104.3		(14.0)
Other adjustments	0.9		0.9
Cash dividends	(182.5)			(182.5)
Ending balance at Mar. 31, 2024	$ 3,503.7	$ 92.0	$ 4,298.8	$ 5,611.0	$ (5,793.1)	$ (705.0)