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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Credit) (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
United States | Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost   $ 5.0 $ 5.6 $ 4.7
Interest cost   21.8 29.8 28.7
Expected return on plan assets   (28.9) (38.1) (39.4)
Amortization of actuarial loss   2.6 2.7 2.6
Curtailment gain (loss)   0.0 0.0 0.0
Settlement loss $ 34.2 0.2 34.4 0.2
Net periodic benefit cost (credit)   0.7 34.4 (3.2)
United States | Other Postretirement        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost   0.1 0.2 0.2
Interest cost   2.4 3.2 3.1
Amortization of actuarial loss   (2.6) (1.3) (1.2)
Amortization of prior service cost (credit)   0.0 0.0 0.0
Special termination benefits   0.0 0.0 0.0
Net periodic benefit cost (credit)   (0.1) 2.1 2.1
Foreign | Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost   7.3 6.5 8.4
Interest cost   15.0 15.8 16.2
Expected return on plan assets   (22.9) (23.2) (25.7)
Amortization of actuarial loss   5.1 3.1 4.1
Curtailment gain (loss)   (0.9) 0.0 (7.7)
Settlement loss   0.8 0.4 0.0
Net periodic benefit cost (credit)   6.2 2.6 10.7
Foreign | Other Postretirement        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost   0.5 0.5 0.7
Interest cost   1.5 1.6 1.7
Amortization of actuarial loss   0.3 0.2 0.5
Amortization of prior service cost (credit)   (0.4) (0.3) (0.4)
Special termination benefits   0.1 0.3 0.8
Net periodic benefit cost (credit)   $ 2.0 $ 2.3 $ 3.3