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 (loss) income	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	1,271.1
Other comprehensive (loss) income	49.3
Ending balance at Jun. 30, 2023	3,631.1	91.4	4,044.6	4,481.5	(4,335.1)	(651.3)
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 (loss) income	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)
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 (loss) income	(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)
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	1,395.1
Other comprehensive (loss) income	(152.6)
Ending balance at Jun. 30, 2024	3,751.8	92.1	4,342.0	6,322.3	(6,227.7)	(776.9)
Beginning balance at Mar. 31, 2024	3,503.7	92.0	4,298.8	5,611.0	(5,793.1)	(705.0)
Shareholders' Equity [Roll Forward]
Net income	889.9			889.9
Other comprehensive (loss) income	(71.9)					(71.9)
Treasury stock purchased	(434.4)				(434.4)
Stock-based compensation activity	44.3	0.1	44.4		(0.2)
Other adjustments	(1.2)		(1.2)
Cash dividends	(178.6)			(178.6)
Ending balance at Jun. 30, 2024	$ 3,751.8	$ 92.1	$ 4,342.0	$ 6,322.3	$ (6,227.7)	$ (776.9)