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Pension and Other Postretirement Benefit Plans - Amounts Recorded in Accumulated Other Comprehensive Loss Not Yet Recognized in Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
United States | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Net unrecognized actuarial gain (loss) $ (95.9) $ (110.1)
Prior service credit 0.0 0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total (95.9) (110.1)
United States | Other Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Net unrecognized actuarial gain (loss) 27.0 25.1
Prior service credit 2.1 0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total 29.1 25.1
Foreign | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Net unrecognized actuarial gain (loss) (109.2) (100.9)
Prior service credit 0.0 0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total (109.2) (100.9)
Foreign | Other Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Net unrecognized actuarial gain (loss) (5.4) (6.1)
Prior service credit 0.6 0.9
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total $ (4.8) $ (5.2)