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Postretirement Benefit Plans - Amount Recognized in Accumulated Other Comprehensive Income Loss (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss $ 250.7 $ 204.5
Prior service cost (benefit) 1.1 5.0
Total 251.8 209.5
Pension [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss 175.7 147.0
Prior service cost (benefit) 4.8 5.7
Total 180.5 152.7
Others Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss 75.0 57.5
Prior service cost (benefit) (3.7) (0.7)
Total $ 71.3 $ 56.8