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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Foreign Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 9.9 $ 11.2 $ 9.9
Interest cost 14.7 14.6 21.7
Expected return on plan assets (14.4) (16.6) (20.0)
Settlement gain     (0.3)
Recognized actuarial losses 11.3 13.6 10.0
Amortization of prior service cost 0.2 0.4 0.5
Amortization of net transition obligations     0.1
Total 21.7 23.2 21.9
United States Pension Plans of US Entity, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 0.8 0.8 0.8
Expected return on plan assets (1.0) (1.1) (1.2)
Recognized actuarial losses 0.5 0.5 0.3
Total 0.3 0.2 (0.1)
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.1 0.1 0.1
Interest cost 0.3 0.3 0.4
Recognized actuarial losses 0.2 0.3 0.2
Amortization of prior service cost (0.8) (0.8) (0.9)
Total $ (0.2) $ (0.1) $ (0.2)