Changes in Equity and Noncontrolling Interests (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			$ 3,723.1	$ 3,278.4
Net income	$ 253.6	$ 208.7	480.9	367.2
Other comprehensive income (loss)	62.1	(32.2)	129.2	20.2
Acquisition resulting in noncontrolling interest			0.8
Purchase of noncontrolling interest			(15.0)
Distributions to shareholders of noncontrolling interests			(4.2)	(4.1)
Purchase of treasury stock			(399.9)	(108.4)
Stock options exercised			74.4	83.7
Dividends declared	(48.8)	(43.2)	(97.8)	(86.3)
Stock-based compensation expense			24.4	23.2
Balance at end of period	$ 3,915.9	$ 3,573.9	$ 3,915.9	$ 3,573.9
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance (in shares)			308.3	308.0
Balance at beginning of period			$ 0.3	$ 0.3
Retirement of treasury stock (in shares)			(5.7)	(2.0)
Stock options exercised (in shares)			2.6	2.6
Balance (in shares)	305.2	308.6	305.2	308.6
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			1,020.9	783.3
Purchase of noncontrolling interest			(5.5)
Stock options exercised			74.4	83.7
Stock-based compensation expense			24.4	23.2
Balance at end of period	1,114.2	890.2	1,114.2	890.2
Retained Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			3,122.7	2,804.4
Net income			476.4	363.2
Retirement of treasury stock			(399.9)	(108.4)
Dividends declared			(97.8)	(86.3)
Balance at end of period	3,101.4	2,972.9	3,101.4	2,972.9
Accumulated Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(469.0)	(349.5)
Other comprehensive income (loss)			128.0	20.7
Balance at end of period	(341.0)	(328.8)	(341.0)	(328.8)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(399.9)	(108.4)
Retirement of treasury stock			399.9	108.4
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			48.2	39.9
Net income			4.5	4.0
Other comprehensive income (loss)			1.2	(0.5)
Acquisition resulting in noncontrolling interest			0.8
Purchase of noncontrolling interest			(9.5)
Distributions to shareholders of noncontrolling interests			(4.2)	(4.1)
Balance at end of period	$ 41.0	$ 39.3	$ 41.0	$ 39.3