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Components of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
U.S. Benefit Plans
   
Amounts recognized in Accumulated Other Comprehensive Income consist of    
Net actuarial loss $ 91.5 $ 79.3
Prior service cost      
Net amount recognized, pre-tax 91.5 79.3
Non-U.S. Benefit Plan
   
Amounts recognized in Accumulated Other Comprehensive Income consist of    
Net actuarial loss 26.8 23.2
Prior service cost      
Net amount recognized, pre-tax $ 26.8 $ 23.2