Unaudited Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss, Net of Tax	Non-controlling Interests In Consolidated Subsidiary
Balance (in shares) at Dec. 31, 2021		319.6
Balance (in shares) at Dec. 31, 2021					(2.4)
Balance at beginning of period at Dec. 31, 2021	$ 8,979.7	$ 3.2	$ 2,789.5	$ 6,475.6	$ (274.8)	$ (14.6)	$ 0.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	351.9			352.0			(0.1)
Other comprehensive income	1.1					1.1
Cash dividends declared	(145.3)			(145.3)
Issuances of common stock (in shares)		0.3			0.1
Issuances of common stock	(11.5)		2.6		$ (14.1)
Stock-based compensation	12.3		13.2	(0.9)
Purchase of common stock for treasury (in shares)					(1.6)
Purchase of common stock for treasury	(203.5)				$ (203.5)
Balance (in shares) at Mar. 31, 2022		319.9
Balance (in shares) at Mar. 31, 2022					(4.1)
Balance at end of period at Mar. 31, 2022	$ 8,984.7	$ 3.2	2,805.3	6,681.4	$ (492.4)	(13.5)	0.7
Balance (in shares) at Dec. 31, 2022		320.3
Balance (in shares) at Dec. 31, 2022	(4.2)				(4.2)
Balance at beginning of period at Dec. 31, 2022	$ 9,686.8	$ 3.2	2,843.2	7,356.3	$ (504.6)	(12.1)	0.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	383.9			383.9
Other comprehensive income	2.8					2.8
Cash dividends declared	(156.5)			(156.5)
Issuances of common stock (in shares)		0.3			0.1
Issuances of common stock	(11.0)		2.9		$ (13.9)
Stock-based compensation	$ 11.3		12.3	(1.0)
Balance (in shares) at Mar. 31, 2023		320.6
Balance (in shares) at Mar. 31, 2023	(4.3)				(4.3)
Balance at end of period at Mar. 31, 2023	$ 9,917.3	$ 3.2	$ 2,858.4	$ 7,582.7	$ (518.5)	$ (9.3)	$ 0.8