Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests	Total
Balance at beginning of period at Dec. 31, 2014	$ 0.3	$ 659.4	$ 2,453.5	$ (205.8)		$ 30.5	$ 2,937.9
Balance (in shares) at Dec. 31, 2014	310.0
Increase (Decrease) In Shareholders' Equity
Net income			763.5			8.8	772.3
Other comprehensive income (loss)				(143.7)		(1.2)	(144.9)
Acquisition resulting in noncontrolling interest						7.9	7.9
Distributions to shareholders of noncontrolling interests						(6.1)	(6.1)
Purchase of treasury stock					$ (248.9)		(248.9)
Retirement of treasury stock			(248.9)		248.9
Retirement of treasury stock (in shares)	(5.0)
Stock options exercised, including tax benefit		79.7					79.7
Stock options exercised, including tax benefit (in shares)	3.0
Dividends declared			(163.7)				(163.7)
Stock-based compensation expense		44.2					44.2
Balance at end of period at Dec. 31, 2015	$ 0.3	783.3	2,804.4	(349.5)		39.9	3,278.4
Balance (in shares) at Dec. 31, 2015	308.0
Increase (Decrease) In Shareholders' Equity
Net income			822.9			9.7	832.6
Other comprehensive income (loss)				(119.5)		(2.1)	(121.6)
Acquisition resulting in noncontrolling interest						7.5	7.5
Distributions to shareholders of noncontrolling interests						(6.8)	(6.8)
Purchase of treasury stock					(325.8)		(325.8)
Retirement of treasury stock			(325.8)		325.8
Retirement of treasury stock (in shares)	(6.0)
Stock options exercised, including tax benefit		190.0					190.0
Stock options exercised, including tax benefit (in shares)	6.0
Dividends declared			(178.8)				(178.8)
Stock-based compensation expense		47.6					47.6
Balance at end of period at Dec. 31, 2016	$ 0.3	1,020.9	3,122.7	(469.0)		48.2	$ 3,723.1
Balance (in shares) at Dec. 31, 2016	308.0						308.3
Increase (Decrease) In Shareholders' Equity
Net income			650.5			10.2	$ 660.7
Other comprehensive income (loss)				268.0		3.0	271.0
Acquisition 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)
Retirement of treasury stock			(618.0)		$ 618.0
Retirement of treasury stock (in shares)	(8.0)
Stock options exercised		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	$ 1,249.0	$ 2,941.5	$ (201.0)		$ 53.6	$ 4,043.4
Balance (in shares) at Dec. 31, 2017	306.0						305.7