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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Credit) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
U.S. Pension      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service cost $ 4.7 $ 3.7 $ 2.9
Interest cost 28.7 28.5 26.2
Expected return on plan assets (39.4) (38.1) (32.4)
Amortization of actuarial (gain) loss 2.6 (0.3) 4.1
Curtailment loss 0.0 0.0 0.0
Settlement loss (gain) 0.2 0.1 0.0
Net periodic benefit cost (credit) (3.2) (6.1) 0.8
Foreign Pension      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service cost 8.4 8.8 10.2
Interest cost 16.2 20.4 20.7
Expected return on plan assets (25.7) (27.0) (25.1)
Amortization of actuarial (gain) loss 4.1 1.3 6.4
Curtailment loss 7.7 0.0 0.0
Settlement loss (gain) 0.0 0.0 2.5
Net periodic benefit cost (credit) 10.7 3.5 14.7
U.S. Other Postretirement      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service cost 0.2 0.2 0.1
Interest cost 3.1 4.0 3.6
Amortization of actuarial (gain) loss (1.2) (0.7) (0.1)
Amortization of prior service credit 0.0 0.0 0.0
Special termination benefits 0.0 0.0 0.0
Settlement loss (gain) 0.0 0.0 0.0
Net periodic benefit cost (credit) 2.1 3.5 3.6
Foreign Other Postretirement      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service cost 0.7 0.9 1.1
Interest cost 1.7 2.0 2.0
Amortization of actuarial (gain) loss 0.5 0.1 0.3
Amortization of prior service credit (0.4) (0.4) (0.4)
Special termination benefits 0.8 0.8 0.7
Settlement loss (gain) 0.0 0.0 (5.9)
Net periodic benefit cost (credit) $ 3.3 $ 3.4 $ (2.2)