Components of Net Periodic Benefit Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.2	$ 2.4	$ 4.2	$ 6.1
Interest cost	91.4	98.1	181.4	196.0
Expected return on plan assets	(105.3)	(118.3)	(210.6)	(237.1)
Amortization of prior service cost			0.3	0.2
Recognized net actuarial loss	38.5	26.5	77.2	52.5
Curtailment gain	(5.7)		(5.7)
Net periodic pension and postretirement expense	21.1	8.7	46.8	17.7
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	62.7	65.5	124.4	132.0
Expected return on plan assets	(71.3)	(83.5)	(142.9)	(168.7)
Amortization of prior service cost	0.2	0.2	0.4	0.4
Recognized net actuarial loss	30.1	19.8	59.9	39.2
Net periodic pension and postretirement expense	21.7	2.0	41.8	2.9
International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.2	2.4	4.2	6.1
Interest cost	28.7	32.6	57.0	64.0
Expected return on plan assets	(34.0)	(34.8)	(67.7)	(68.4)
Amortization of prior service cost	(0.2)	(0.2)	(0.1)	(0.2)
Recognized net actuarial loss	8.4	6.7	17.3	13.3
Curtailment gain	(5.7)		(5.7)
Net periodic pension and postretirement expense	(0.6)	6.7	5.0	14.8
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1	0.2	0.2
Interest cost	2.3	2.5	4.5	4.9
Expected return on plan assets	(0.2)	(0.2)	(0.3)	(0.3)
Amortization of prior service cost	0.4	0.5	0.9	0.9
Recognized net actuarial loss	1.1	1.0	2.2	2.0
Net periodic pension and postretirement expense	$ 3.7	$ 3.9	$ 7.5	$ 7.7