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Company Transformation - Roll Forward of Transformational Accrual (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Components Of Transformation Costs [Line Items]    
Charges for actions during the period $ 20.8 $ 636.2
Transformation Costs [Member]
   
Components Of Transformation Costs [Line Items]    
Transformation accrual - January 1 33.9 2.0
Charges for actions during the period 20.8 636.2
Cash payments (47.3) (559.9)
Asset impairment and other non-cash charges, net (0.5) (44.4)
Transformation accrual - December 31 6.9 33.9
Continuing Operations [Member]
   
Components Of Transformation Costs [Line Items]    
Charges for actions during the period 13.0 396.1
Continuing Operations [Member] | Transformation Costs [Member]
   
Components Of Transformation Costs [Line Items]    
Charges for actions during the period 13.0 396.1
Discontinued Operations [Member]
   
Components Of Transformation Costs [Line Items]    
Charges for actions during the period 7.8 240.1
Discontinued Operations [Member] | Transformation Costs [Member]
   
Components Of Transformation Costs [Line Items]    
Charges for actions during the period $ 7.8 $ 240.1