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Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized $ 53.0 $ 60.4
Pension Benefits [Member] | Other Long-Term Assets [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized 89.1 102.0
Pension Benefits [Member] | Current Liabilities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized (2.1) (2.0)
Pension Benefits [Member] | Other Long-Term Liabilities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized (34.0) (39.6)
Other Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized (50.9) (59.8)
Other Benefits [Member] | Current Liabilities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized (3.2) (3.7)
Other Benefits [Member] | Other Long-Term Liabilities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized $ (47.7) $ (56.1)