Pensions and Other Postretirement Benefits Expected Benefit Payments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	$ 33.3
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	37.2
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	41.8
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	46.4
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	52.5
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	366.7
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	4.6
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	5.1
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	5.3
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	5.8
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	5.9
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	37.1
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	16.0
Prescription Drug Subsidy Receipts, Year One	1.6
Defined Benefit Plan, Net Expected Future Benefit Payments in Year One	14.4
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	16.4
Prescription Drug Subsidy Receipts, Year Two	1.8
Defined Benefit Plan, Net Expected Future Benefit Payments in Year Two	14.6
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	16.6
Prescription Drug Subsidy Receipts, Year Three	1.9
Defined Benefit Plan, Net Expected Future Benefit Payments in Year Three	14.7
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	16.7
Prescription Drug Subsidy Receipts, Year Four	2.1
Defined Benefit Plan, Net Expected Future Benefit Payments in Year Four	14.6
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	16.6
Prescription Drug Subsidy Receipts, Year Five	2.2
Defined Benefit Plan, Net Expected Future Benefit Payments in Year Five	14.4
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	79.1
Prescription Drug Subsidy Receipts, Five Fiscal Years Thereafter	12.7
Defined Benefit Plan, Net Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 66.4