Changes in Equity and Noncontrolling Interests (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			$ 2,937.9	$ 2,880.1
Balance at beginning of period			(205.8)
Net income	$ 207.3	$ 184.2	569.7	520.4
Other comprehensive income (loss)	(48.1)	(44.9)	(98.4)	(42.4)
Distributions to shareholders of noncontrolling interests			(6.1)	(3.6)
Acquisition resulting in noncontrolling interest			7.9
Purchase of treasury stock			(195.6)	(400.8)
Stock options exercised, including tax benefit			54.4	116.5
Dividends declared	(43.2)	(39.1)	(120.5)	(101.9)
Stock-based compensation expense			32.1	29.4
Balance at end of period	3,181.4	$ 2,997.7	3,181.4	$ 2,997.7
Balance at end of period	$ (303.6)		$ (303.6)
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period (in shares)			309.8	316.4
Balance at beginning of period			$ 0.3	$ 0.3
Retirement of treasury stock (in shares)			(3.5)	(8.5)
Stock options exercised, including tax benefit (in shares)			1.9	4.4
Balance at end of period (in shares)	308.2	312.3	308.2	312.3
Balance at end of period	$ 0.3	$ 0.3	$ 0.3	$ 0.3
Additional Paid in Capital
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			659.4	489.8
Stock options exercised, including tax benefit			54.4	116.5
Stock-based compensation expense			32.1	29.4
Balance at end of period	745.9	635.7	745.9	635.7
Retained Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,453.5	2,424.4
Net income			563.3	515.6
Retirement of treasury stock			(195.6)	(400.8)
Dividends declared			(120.5)	(101.9)
Balance at end of period	2,700.7	2,437.3	2,700.7	2,437.3
Accumulated Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(205.8)	(55.0)
Other comprehensive income (loss)			(97.8)	(42.1)
Balance at end of period	(303.6)	(97.1)	(303.6)	(97.1)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(195.6)	(400.8)
Retirement of treasury stock			195.6	400.8
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			30.5	20.6
Net income			6.4	4.8
Other comprehensive income (loss)			(0.6)	(0.3)
Distributions to shareholders of noncontrolling interests			(6.1)	(3.6)
Acquisition resulting in noncontrolling interest			7.9
Balance at end of period	$ 38.1	$ 21.5	$ 38.1	$ 21.5