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Postretirement Benefit Plans - Summary of Funded Status of Postretirement Benefit Plans and Presentation of Such Balances within Consolidated Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 257.0 $ 191.8  
Projected benefit obligation 600.0 521.9  
Funded status (343.0) (330.1)  
Amounts reported within:      
Accrued liabilities (12.7) (14.7)  
Non-current liabilities (330.3) (315.4)  
Pension [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 249.1 184.3 186.7
Projected benefit obligation 387.0 330.1 298.6
Funded status (137.9) (145.8)  
Amounts reported within:      
Accrued liabilities (4.2) (3.6)  
Non-current liabilities (133.7) (142.2)  
Others Benefits [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.9 7.5 7.8
Projected benefit obligation 213.0 191.8 175.5
Funded status (205.1) (184.3)  
Amounts reported within:      
Accrued liabilities (8.5) (11.1)  
Non-current liabilities $ (196.6) $ (173.2)