Schedule of Controlling and Non-Controlling Interest (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Noncontrolling Interest [Line Items]
Balance at beginning of period	$ 3,865.2	$ 3,225.6	$ 3,468.1	$ 3,442.1
Total Comprehensive Income:
Net income	148.4	136.8	281.9	172.5
Foreign currency translation	(21.2)	20.1	38.6	(90.7)
Net change in cash flow hedges	3.9	(0.4)	2.7	(0.4)
Defined benefit pension plan	0.6	1.5	1.4	3.0
Comprehensive income	131.7	158.0	324.6	84.4
Common Stock incentives	5.6	6.5	8.9	17.4
Cash dividends declared	(51.2)	(49.1)	(102.3)	(98.5)
Repurchased shares				(104.4)
Dividends paid to non-controlling interest on subsidiary shares	0.0		(1.7)
Investment in subsidiary by non-controlling interest	1.1		254.8
Balance at end of period	3,952.4	3,341.0	3,952.4	3,341.0
Controlling
Noncontrolling Interest [Line Items]
Balance at beginning of period	3,600.2	3,210.6	3,455.6	3,427.1
Total Comprehensive Income:
Net income	148.4	136.7	281.5	172.4
Foreign currency translation	(30.7)	20.1	29.0	(90.7)
Net change in cash flow hedges	3.9	(0.4)	2.7	(0.4)
Defined benefit pension plan	0.6	1.5	1.4	3.0
Comprehensive income	122.2	157.9	314.6	84.3
Common Stock incentives	5.6	6.5	8.9	17.4
Cash dividends declared	(51.2)	(49.1)	(102.3)	(98.5)
Repurchased shares				(104.4)
Balance at end of period	3,676.8	3,325.9	3,676.8	3,325.9
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Balance at beginning of period	265.0	15.0	12.5	15.0
Total Comprehensive Income:
Net income	0.0	0.1	0.4	0.1
Foreign currency translation	9.5	0.0	9.6	0.0
Comprehensive income	9.5	0.1	10.0	0.1
Dividends paid to non-controlling interest on subsidiary shares	0.0		(1.7)
Investment in subsidiary by non-controlling interest	1.1		254.8
Balance at end of period	$ 275.6	$ 15.1	$ 275.6	$ 15.1