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Components of Amounts Recognized in Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
U.S. Benefit Plans
   
Amounts recognized in the Balance Sheet consist of    
Long term pension liabilities $ (67.5) $ (59.6)
Accumulated other comprehensive loss, pre-tax 91.5 79.3
Net amount recognized 24.0 19.7
Non-U.S. Benefit Plan
   
Amounts recognized in the Balance Sheet consist of    
Long term pension liabilities (10.8) (9.2)
Accumulated other comprehensive loss, pre-tax 26.8 23.2
Net amount recognized $ 16.0 $ 14.0