Pensions and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Pension and Other Postretirement Benefits Disclosure [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ 59.8
Pension, Amount that will be recognized from AOCI to Income, after tax	39.1
Pension Contributions	53.0
Pension Benefits, U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Curtailments	0	0
Prior Service Credit - Plan Amendment	0	0
Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.50%	7.50%
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(0.6)	(0.2)
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	50.0
United Kingdom, Pounds
Pension and Other Postretirement Benefits Disclosure [Line Items]
Pension Contributions	2.6	2.9
Other Postretirement Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Curtailments	4.2	0
Prior Service Credit - Plan Amendment	5.0	0
Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.75%	5.75%
Actual Return on Plan Assets	5.77%	6.27%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	8.00%	8.50%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	0.2
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	(0.2)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	3.9
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	(2.9)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	7.3	4.9	4.4
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received	1.3
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	5.0
Pension, Amount that will be recognized from AOCI to Income, after tax	3.2
Pension Benefits, Non U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Curtailments	0	0
Prior Service Credit - Plan Amendment	0	0
Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.80%	6.70%
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(0.2)	(0.2)
Pension Contributions	4.1	4.7
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 2.6
defined benefit plan schedule of contributions	0.40%
Other Investments [Member] | Pension Benefits, Non U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	25.00%
Alternative Investments [Member] | Pension Benefits, U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	10.00%
Equity Securities [Member] | Pension Benefits, U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	60.00%
Equity Securities [Member] | Pension Benefits, Non U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	75.00%
Debt Securities [Member] | Pension Benefits, U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	30.00%
Minimum [Member] | Pension Benefits, Non U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
defined benefit plan schedule of contributions	24.80%
Minimum [Member] | Private Equity Funds [Member] | Pension Benefits, U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Private equity funds, number of years to maturity	5
Maximum [Member] | Private Equity Funds [Member] | Pension Benefits, U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Private equity funds, number of years to maturity	8