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Components of Provision (Benefit) for Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ (1.8) $ (3.8) $ (3.0)
Foreign 3.2 2.1 5.3
State and local 0.1 0.3 0.3
Current, Total 1.5 (1.4) 2.6
Deferred:      
Federal 2.1 4.7 70.8
Foreign 0.3 0.2 (0.9)
State and local     2.6
Deferred, Total 2.4 4.9 72.5
Total income tax provision $ 3.9 $ 3.5 $ 75.1