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Employee Benefit and Retirement Plans - Summary of Components of Pension and Postretirement Benefit Expense (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
U.S. [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.7 $ 0.7 $ 1.4 $ 1.4
Interest cost 12.6 12.5 25.3 20.1
Expected return on plan assets (18.3) (19.2) (36.7) (30.6)
Amortization, net 5.9 5.4 11.8 10.8
Net periodic cost 0.9 (0.6) 1.8 1.7
International [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1.9 1.8 3.7 3.1
Interest cost 3.4 4.9 6.7 9.5
Expected return on plan assets (4.7) (5.8) (9.2) (11.3)
Amortization, net 0.6 0.7 1.2 1.4
Net periodic cost 1.2 1.6 2.4 2.7
Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.1   0.1  
Interest cost 0.5 0.5 1.1 1.0
Amortization, net (2.3) (2.6) (4.6) (5.2)
Net periodic cost $ (1.7) $ (2.1) $ (3.4) $ (4.2)