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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability $ (216.2) $ (218.4)
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current benefit payment liability (1.0) (1.1)
Accrued benefit liability (213.0) (204.7)
Net amount recognized (214.0) (205.8)
Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current benefit payment liability (0.4) (2.0)
Accrued benefit liability (3.2) (13.6)
Net amount recognized $ (3.6) $ (15.6)