Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Total
Balance at beginning of period at Dec. 31, 2016	$ 0.3	$ 0.0	$ 1,020.9	$ 3,122.7	$ (469.0)	$ 48.2	$ 3,723.1
Balance (in shares) at Dec. 31, 2016	308.0
Balance (in shares) at Dec. 31, 2016		0.0
Increase (Decrease) In Shareholders' Equity
Net income				650.5		10.2	660.7
Other comprehensive income (loss)					268.0	3.0	271.0
Acquisitions resulting in noncontrolling interest						11.1	11.1
Purchase of noncontrolling interest			(5.5)			(10.3)	(15.8)
Distributions to shareholders of noncontrolling interests						(8.6)	(8.6)
Purchase of treasury stock		$ (618.0)					(618.0)
Purchase of treasury stock (in shares)		(8.0)
Retirement of treasury stock	$ 0.0	$ 618.0		(618.0)			0.0
Retirement of treasury stock (in shares)	(8.0)	8.0
Stock options exercised	$ 0.0		183.9				183.9
Stock options exercised (in shares)	6.0
Dividends declared				(213.7)			(213.7)
Stock-based compensation expense			49.7				49.7
Balance at end of period at Dec. 31, 2017	$ 0.3	$ 0.0	1,249.0	2,941.5	(201.0)	53.6	4,043.4
Balance (in shares) at Dec. 31, 2017	306.0
Balance (in shares) at Dec. 31, 2017		0.0
Increase (Decrease) In Shareholders' Equity
Cumulative effect of adoption of revenue recognition standard | Impact of ASU 2014-09				3.2			3.2
Reclassification of income tax effects resulting from the Tax Act (ASU 2018-02) (Note 1)				23.5	(23.5)		0.0
Net income				1,205.0		11.9	1,216.9
Other comprehensive income (loss)					(165.7)	(2.7)	(168.4)
Acquisitions resulting in noncontrolling interest						0.3	0.3
Purchase of noncontrolling interest			(2.3)			(5.4)	(7.7)
Distributions to shareholders of noncontrolling interests						(10.5)	(10.5)
Purchase of treasury stock		$ (935.2)					(935.2)
Purchase of treasury stock (in shares)		(11.0)
Retirement of treasury stock	$ 0.0	$ 880.2		(880.2)			0.0
Retirement of treasury stock (in shares)	(10.0)	10.0
Stock options exercised	$ 0.0		130.9				130.9
Stock options exercised (in shares)	3.0
Dividends declared				(264.3)			(264.3)
Stock-based compensation expense			55.6				55.6
Balance at end of period at Dec. 31, 2018	$ 0.3	$ (55.0)	1,433.2	3,028.7	(390.2)	47.2	$ 4,064.2
Balance (in shares) at Dec. 31, 2018	299.0						298.5
Balance (in shares) at Dec. 31, 2018		(1.0)
Increase (Decrease) In Shareholders' Equity
Net income				1,155.0		9.0	$ 1,164.0
Other comprehensive income (loss)					(40.7)	(0.4)	(41.1)
Acquisitions resulting in noncontrolling interest						30.0	30.0
Purchase of noncontrolling interest			(23.4)			(14.6)	(38.0)
Distributions to shareholders of noncontrolling interests						(5.3)	(5.3)
Purchase of treasury stock		$ (601.7)					(601.7)
Purchase of treasury stock (in shares)		(7.0)
Retirement of treasury stock	$ 0.0	$ 514.1		(514.1)			0.0
Retirement of treasury stock (in shares)	(6.0)	6.0
Stock options exercised	$ 0.0	$ 71.8	210.5	(35.9)			246.4
Stock options exercised (in shares)	6.0	1.0
Dividends declared				(285.3)			(285.3)
Stock-based compensation expense			63.0				63.0
Balance at end of period at Dec. 31, 2019	$ 0.3	$ (70.8)	$ 1,683.3	$ 3,348.4	$ (430.9)	$ 65.9	$ 4,596.2
Balance (in shares) at Dec. 31, 2019	299.0						297.9
Balance (in shares) at Dec. 31, 2019		(1.0)