Changes in Equity and Noncontrolling Interests (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	$ 180.6	$ 176.4	362.4	336.2
Other comprehensive income	15.4	17.5	(50.3)	2.5
Distributions to shareholders of noncontrolling interests			(4.4)	(1.7)
Acquisition resulting in noncontrolling interest			8.0
Purchase of treasury stock			(143.6)	(250.2)
Stock options exercised, including tax benefit			50.0	75.3
Dividends declared	(38.6)	(31.4)	(77.4)	(62.8)
Stock-based compensation			20.2	19.2
Balance at end of period	3,102.8	$ 2,998.6	3,102.8	$ 2,998.6
Balance at end of period	$ (256.1)		$ (256.1)
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)			(2.5)	(5.5)
Stock options exercised, including tax benefit (in shares)			1.7	2.9
Balance at end of period (in shares)	309.0	313.8	309.0	313.8
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			50.0	75.3
Stock-based compensation			20.2	19.2
Balance at end of period	729.6	584.3	729.6	584.3
Retained Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,453.5	2,424.4
Net income			358.8	333.4
Retirement of treasury stock			(143.6)	(250.2)
Dividends declared			(77.4)	(62.8)
Balance at end of period	2,591.3	2,444.8	2,591.3	2,444.8
Accumulated Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(205.8)	(55.0)
Other comprehensive income			(50.3)	2.9
Balance at end of period	(256.1)	(52.1)	(256.1)	(52.1)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(143.6)	(250.2)
Retirement of treasury stock			143.6	250.2
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			30.5	20.6
Net income			3.6	2.8
Other comprehensive income				(0.4)
Distributions to shareholders of noncontrolling interests			(4.4)	(1.7)
Acquisition resulting in noncontrolling interest			8.0
Balance at end of period	$ 37.7	$ 21.3	$ 37.7	$ 21.3