Changes in Equity and Noncontrolling Interests (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			$ 3,278.4	$ 2,937.9
Net income	$ 208.7	$ 180.6	367.2	362.4
Other comprehensive income (loss)	(32.2)	15.4	20.2	(50.3)
Acquisition resulting in noncontrolling interest				8.0
Distributions to shareholders of noncontrolling interests			(4.1)	(4.4)
Purchase of treasury stock			(108.4)	(143.6)
Stock options exercised, including tax benefit			83.7	50.0
Dividends declared	(43.2)	(38.6)	(86.3)	(77.4)
Stock-based compensation expense			23.2	20.2
Balance at end of period	$ 3,573.9	$ 3,102.8	$ 3,573.9	$ 3,102.8
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance (in shares)			308.0	309.9
Balance at beginning of period			$ 0.3	$ 0.3
Retirement of treasury stock (in shares)			(2.0)	(2.5)
Stock options exercised, including tax benefit (in shares)			2.6	1.6
Balance (in shares)	308.6	309.0	308.6	309.0
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			783.3	659.4
Stock options exercised, including tax benefit			83.7	50.0
Stock-based compensation expense			23.2	20.2
Balance at end of period	890.2	729.6	890.2	729.6
Retained Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,804.4	2,453.5
Net income			363.2	358.8
Retirement of treasury stock			(108.4)	(143.6)
Dividends declared			(86.3)	(77.4)
Balance at end of period	2,972.9	2,591.3	2,972.9	2,591.3
Accumulated Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(349.5)	(205.8)
Other comprehensive income (loss)			20.7	(50.3)
Balance at end of period	(328.8)	(256.1)	(328.8)	(256.1)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(108.4)	(143.6)
Retirement of treasury stock			108.4	143.6
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			39.9	30.5
Net income			4.0	3.6
Other comprehensive income (loss)			(0.5)
Acquisition resulting in noncontrolling interest				8.0
Distributions to shareholders of noncontrolling interests			(4.1)	(4.4)
Balance at end of period	$ 39.3	$ 37.7	$ 39.3	$ 37.7