Schedule of Non-Controlling Interest (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Noncontrolling Interest [Line Items]
Balance at beginning of period	$ 3,225.6	$ 3,999.9	$ 3,442.1	$ 4,000.4
Total Comprehensive Income:
Net income	136.8	83.2	172.5	214.3
Foreign currency translation	20.1	(0.7)	(90.7)	(2.3)
Net change in cash flow hedges	(0.4)		(0.4)
Defined benefit pension plan	1.5	0.3	3.0	0.2
Comprehensive income	158.0	82.8	84.4	212.2
Common Stock incentives	6.5	7.7	17.4	24.0
Cash dividends declared	(49.1)	(49.5)	(98.5)	(98.3)
Repurchased shares		(97.2)	(104.4)	(191.5)
Dividends paid to non-controlling interests on subsidiary shares		(0.3)		(3.4)
Balance at end of period	3,341.0	3,943.4	3,341.0	3,943.4
Controlling
Noncontrolling Interest [Line Items]
Balance at beginning of period	3,210.6	3,983.5	3,427.1	3,981.3
Total Comprehensive Income:
Net income	136.7	82.8	172.4	213.1
Foreign currency translation	20.1	(0.7)	(90.7)	(1.9)
Net change in cash flow hedges	(0.4)		(0.4)
Defined benefit pension plan	1.5	0.3	3.0	0.2
Comprehensive income	157.9	82.4	84.3	211.4
Common Stock incentives	6.5	7.7	17.4	24.0
Cash dividends declared	(49.1)	(49.5)	(98.5)	(98.3)
Repurchased shares		(97.2)	(104.4)	(191.5)
Balance at end of period	3,325.9	3,926.9	3,325.9	3,926.9
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Balance at beginning of period	15.0	16.4	15.0	19.1
Total Comprehensive Income:
Net income	0.1	0.4	0.1	1.2
Foreign currency translation	0.0	0.0	0.0	(0.4)
Comprehensive income	0.1	0.4	0.1	0.8
Dividends paid to non-controlling interests on subsidiary shares		(0.3)		(3.4)
Balance at end of period	$ 15.1	$ 16.5	$ 15.1	$ 16.5