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Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Pension Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized $ 113.5 $ 17.3
Pension Benefits [Member] | Other Assets Noncurrent [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized 148.9 53.7
Pension Benefits [Member] | Current Liabilities [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized (2.3) (2.0)
Pension Benefits [Member] | Other Noncurrent Liabilities [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized (33.1) (34.4)
Other Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized (54.8) (63.0)
Other Benefits [Member] | Other Assets Noncurrent [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized      
Other Benefits [Member] | Current Liabilities [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized (4.0) (4.2)
Other Benefits [Member] | Other Noncurrent Liabilities [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized $ (50.8) $ (58.8)