Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Net of Tax	Accumulated Other Comprehensive Income (Loss), Net of Tax Cumulative Effect, Period of Adoption, Adjustment	Non-controlling Interests In Consolidated Subsidiary
Balance (in shares) at Dec. 31, 2018			351.9				29.4
Balance at Dec. 31, 2018	$ 7,929.5	$ 0.0	$ 3.5	$ 4,924.9	$ 4,750.5	$ (3.1)	$ (1,782.6)	$ 30.8	$ 3.1	$ 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,073.8				1,073.3					0.5
Change in the value of derivative instruments, net of tax	(29.2)							(29.2)
Employee benefit plan liability adjustments, net of tax	(2.5)							(2.5)
Cash dividends declared	(499.4)				(499.4)
Issuances of common stock (in shares)			1.4				0.2
Issuances of common stock	9.3			26.9			$ (17.6)
Stock-based compensation	39.0			43.0	(4.0)
Purchase of common stock for treasury (in shares)							(4.9)
Purchase of common stock for treasury	(399.4)						$ (399.4)
Distributions paid	(0.2)									(0.2)
Balance (in shares) at Dec. 31, 2019			353.3				34.5
Balance at Dec. 31, 2019	8,120.9		$ 3.5	4,994.8	5,317.3		$ (2,199.6)	2.2	$ 3.1	2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	969.6				967.2					2.4
Change in the value of derivative instruments, net of tax	(16.7)							(16.7)
Employee benefit plan liability adjustments, net of tax	2.1							2.1
Cash dividends declared	(528.8)				(528.8)
Issuances of common stock (in shares)			1.3				0.1
Issuances of common stock	3.9			21.6			$ (17.7)
Stock-based compensation	36.8			40.7	(3.9)
Purchase of common stock for treasury (in shares)							(1.2)
Purchase of common stock for treasury	(98.8)						$ (98.8)
Shares returned to unissued status (in shares)			(35.8)				35.8
Shares returned to unissued status	0.0		$ (0.3)	(2,315.7)			$ 2,316.0
Distributions paid	(0.2)									(0.2)
Balance (in shares) at Dec. 31, 2020			318.8				0.0
Balance at Dec. 31, 2020	8,488.8		$ 3.2	2,741.4	5,751.8		$ (0.1)	(12.4)		4.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,292.3				1,290.4					1.9
Change in the value of derivative instruments, net of tax	4.6							4.6
Employee benefit plan liability adjustments, net of tax	(6.8)							(6.8)
Cash dividends declared	(563.0)				(563.0)
Issuances of common stock (in shares)			0.8				0.2
Issuances of common stock	(12.0)			10.5			$ (22.5)
Stock-based compensation	56.7			60.3	(3.6)
Purchase of common stock for treasury (in shares)							(2.2)
Purchase of common stock for treasury	(252.2)						$ (252.2)
Purchase of minority interest	(27.5)			(22.7)						(4.8)
Distributions paid	(1.2)									(1.2)
Balance (in shares) at Dec. 31, 2021			319.6				2.4
Balance at Dec. 31, 2021	$ 8,979.7		$ 3.2	$ 2,789.5	$ 6,475.6		$ (274.8)	$ (14.6)		$ 0.8