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Pension and Other Postretirement Benefit Plans - Pretax Amounts Recorded in Accumulated Other Comprehensive Loss That Are Expected To Be Recognized As Components of Net Periodic Benefit Cost in Next Fiscal Year (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
United States | Pension  
Defined Benefit Plan Disclosure [Line Items]  
Net unrecognized actuarial gain (loss) $ (2.1)
Prior service credit 0.0
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year (2.1)
United States | Other Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
Net unrecognized actuarial gain (loss) 2.2
Prior service credit 0.2
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year 2.4
Foreign | Pension  
Defined Benefit Plan Disclosure [Line Items]  
Net unrecognized actuarial gain (loss) (6.0)
Prior service credit 0.0
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year (6.0)
Foreign | Other Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
Net unrecognized actuarial gain (loss) (0.1)
Prior service credit 0.3
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year $ 0.2