Schedule of Non-Controlling Interest (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Noncontrolling Interest [Line Items]
Balance at beginning of period	$ 3,905.8	$ 3,580.9	$ 3,776.1	$ 3,349.0
Total Comprehensive Income:
Net income	124.9	118.0	389.4	345.6
Foreign currency translation	39.0	45.5	(15.6)	24.3
Defined benefit pension plan	1.8	1.3	5.1	3.6
Comprehensive income	165.7	164.8	378.9	373.5
Common Stock incentives	8.8	3.6	21.4	12.5
Cash dividends declared	(48.0)	(47.7)	(143.7)	(137.4)
Common stock issuance, net				104.8
Dividends paid to non-controlling interests on subsidiary shares	0		(0.4)	(0.8)
Balance at end of period	4,032.3	3,701.6	4,032.3	3,701.6
Parent
Noncontrolling Interest [Line Items]
Balance at beginning of period	3,886.1	3,565.6	3,758.6	3,333.4
Total Comprehensive Income:
Net income	123.9	117.5	386.1	344.4
Foreign currency translation	39.0	45.2	(15.9)	24.2
Defined benefit pension plan	1.8	1.3	5.1	3.6
Comprehensive income	164.7	164.0	375.3	372.2
Common Stock incentives	8.8	3.6	21.4	12.5
Cash dividends declared	(48.0)	(47.7)	(143.7)	(137.4)
Common stock issuance, net				104.8
Balance at end of period	4,011.6	3,685.5	4,011.6	3,685.5
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Balance at beginning of period	19.7	15.3	17.5	15.6
Total Comprehensive Income:
Net income	1.0	0.5	3.3	1.2
Foreign currency translation	0	0.3	0.3	0.1
Comprehensive income	1.0	0.8	3.6	1.3
Dividends paid to non-controlling interests on subsidiary shares	0		(0.4)	(0.8)
Balance at end of period	$ 20.7	$ 16.1	$ 20.7	$ 16.1