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Pensions - Summary of Components of Net Postretirement Pensions Expense (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
U.S. Benefit Plans
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 1.9 1.9 3.9 3.7
Amortization of actuarial loss 1.3 1.9 2.5 3.7
Expected return on plan assets (2.2) (2.2) (4.5) (4.4)
Net postretirement pension expense 1.0 1.6 1.9 3.0
Non-U.S. Benefit Plan
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.1 0.1 0.2 0.1
Interest cost 0.6 0.6 1.3 1.2
Amortization of actuarial loss 0.1 0.2 0.2 0.4
Expected return on plan assets (0.9) (0.7) (1.8) (1.3)
Net postretirement pension expense $ (0.1) $ 0.2 $ (0.1) $ 0.4