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Company Transformation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Transformation costs before income tax expense $ 20.8 $ 636.2
Continuing Operations [Member]
   
Transformation costs before income tax expense 13.0 396.1
Discontinued Operations [Member]
   
Transformation costs before income tax expense $ 7.8 $ 240.1