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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability $ (163.3) $ (175.9)
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current benefit payment liability (1.5) (1.1)
Accrued benefit liability (162.1) (174.7)
Net amount recognized (163.6) (175.8)
Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current benefit payment liability (0.2) (0.2)
Accrued benefit liability (1.2) (1.4)
Net amount recognized $ (1.4) $ (1.6)