Schedule of Non-Controlling Interest (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Noncontrolling Interest [Line Items]
Balance at beginning of period	$ 3,776.1	$ 3,349.0
Total Comprehensive Income:
Net income	125.1	101.4
Foreign currency translation	(35.9)	27.3
Defined benefit pension plan	1.6	1.3
Comprehensive income	90.8	130.0
Common Stock incentives	3.9	4.4
Cash dividends declared	(47.8)	(44.7)
Common stock issuance, net		(1.4)
Dividends paid to non-controlling interests on subsidiary shares
Balance at end of period	3,823.0	3,437.3
Parent
Noncontrolling Interest [Line Items]
Balance at beginning of period	3,758.6	3,333.4
Total Comprehensive Income:
Net income	123.5	100.5
Foreign currency translation	(35.9)	27.2
Defined benefit pension plan	1.6	1.3
Comprehensive income	89.2	129.0
Common Stock incentives	3.9	4.4
Cash dividends declared	(47.8)	(44.7)
Common stock issuance, net		(1.4)
Dividends paid to non-controlling interests on subsidiary shares
Balance at end of period	3,803.9	3,420.7
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Balance at beginning of period	17.5	15.6
Total Comprehensive Income:
Net income	1.6	0.9
Foreign currency translation	0	0.1
Comprehensive income	1.6	1.0
Dividends paid to non-controlling interests on subsidiary shares
Balance at end of period	$ 19.1	$ 16.6