Components of Net Periodic Benefit Expense (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
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.6	$ 2.3	$ 7.8	$ 6.5
Interest cost	82.0	91.3	244.3	272.7
Expected return on assets	(108.5)	(105.3)	(323.9)	(315.9)
Amortization of prior service cost	(0.8)	(0.1)	(1.2)	0.2
Recognized net actuarial loss	48.1	41.7	142.4	118.9
Curtailment gain				(5.7)
Net periodic benefit expense	23.4	29.9	69.4	76.7
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	55.3	63.8	165.1	188.2
Expected return on assets	(73.0)	(71.4)	(218.7)	(214.3)
Amortization of prior service cost	0.2	0.1	0.5	0.5
Recognized net actuarial loss	35.1	31.9	104.1	91.8
Net periodic benefit expense	17.6	24.4	51.0	66.2
International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.6	2.3	7.8	6.5
Interest cost	26.7	27.5	79.2	84.5
Expected return on assets	(35.5)	(33.9)	(105.2)	(101.6)
Amortization of prior service cost	(1.0)	(0.2)	(1.7)	(0.3)
Recognized net actuarial loss	13.0	9.8	38.3	27.1
Curtailment gain				(5.7)
Net periodic benefit expense	5.8	5.5	18.4	10.5
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	0.2	0.5	0.4
Interest cost	2.0	2.2	6.0	6.7
Expected return on assets	(0.2)	(0.1)	(0.4)	(0.4)
Amortization of prior service cost	0.5	0.4	1.4	1.3
Recognized net actuarial loss	1.4	1.1	4.1	3.3
Net periodic benefit expense	$ 3.9	$ 3.8	$ 11.6	$ 11.3