Schedule of Non-Controlling Interest (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Noncontrolling Interest [Line Items]
Balance at beginning of period	$ 3,823.0	$ 3,437.3	$ 3,776.1	$ 3,349.0
Total Comprehensive Income:
Net income	139.4	126.2	264.5	227.6
Foreign currency translation	(18.7)	(48.4)	(54.6)	(21.2)
Defined benefit pension plan	1.6	1.0	3.2	2.3
Comprehensive income	122.3	78.8	213.1	208.7
Common Stock incentives	8.8	4.4	12.7	8.9
Cash dividends declared	(47.9)	(45.0)	(95.7)	(89.7)
Common stock issuance, net		106.2		104.8
Dividends paid to non-controlling interests on subsidiary shares	(0.4)	(0.8)	(0.4)	(0.8)
Balance at end of period	3,905.8	3,580.9	3,905.8	3,580.9
Parent
Noncontrolling Interest [Line Items]
Balance at beginning of period	3,803.9	3,420.7	3,758.6	3,333.4
Total Comprehensive Income:
Net income	138.7	126.4	262.2	226.9
Foreign currency translation	(19.0)	(48.1)	(54.9)	(21.0)
Defined benefit pension plan	1.6	1.0	3.2	2.3
Comprehensive income	121.3	79.3	210.5	208.2
Common Stock incentives	8.8	4.4	12.7	8.9
Cash dividends declared	(47.9)	(45.0)	(95.7)	(89.7)
Common stock issuance, net		106.2		104.8
Balance at end of period	3,886.1	3,565.6	3,886.1	3,565.6
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Balance at beginning of period	19.1	16.6	17.5	15.6
Total Comprehensive Income:
Net income	0.7	(0.2)	2.3	0.7
Foreign currency translation	0.3	(0.3)	0.3	(0.2)
Comprehensive income	1.0	(0.5)	2.6	0.5
Dividends paid to non-controlling interests on subsidiary shares	(0.4)	(0.8)	(0.4)	(0.8)
Balance at end of period	$ 19.7	$ 15.3	$ 19.7	$ 15.3