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Pensions - Summary of Components of Net Postretirement Pensions Expense (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
U.S. Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.0 $ 0.0 $ 0.0 $ 0.0
Interest cost 1.9 2.0 5.7 5.9
Amortization of actuarial loss 1.7 1.3 5.1 3.8
Expected return on plan assets (2.6) (2.3) (7.7) (6.8)
Net postretirement pension expense (benefit) 1.0 1.0 3.1 2.9
Non-U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.1 0.2 0.3
Interest cost 0.6 0.7 1.6 2.0
Amortization of actuarial loss 0.2 0.1 0.6 0.3
Expected return on plan assets (0.6) (0.9) (2.0) (2.7)
Net postretirement pension expense (benefit) $ 0.2 $ 0.0 $ 0.4 $ (0.1)