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Pensions - Summary of Components of Net Postretirement Pensions Expense (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
U.S. Benefit Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 2.0 1.8
Amortization of actuarial loss 1.2 1.8
Expected return on plan assets (2.3) (2.2)
Net postretirement pension expense 0.9 1.4
Non-U.S. Benefit Plan
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.1 0
Interest cost 0.7 0.6
Amortization of actuarial loss 0.1 0.2
Expected return on plan assets (0.9) (0.6)
Net postretirement pension expense $ 0 $ 0.2