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Company Transformation - Components of Transformation Costs (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Components Of Transformation Costs [Line Items]    
Transformation costs before income tax expense $ 20.8 $ 636.2
Transformation Costs [Member]
    
Components Of Transformation Costs [Line Items]    
Loss on extinguishment of debt 1.0 296.8
Advisory fees 10.8 139.4
Asset impairment   64.5
Information technology costs 2.6 46.3
Employee retention and other compensation costs 2.3 56.9
Lease termination and other real estate costs 1.9 14.1
Other costs 2.2 18.2
Transformation costs before income tax expense 20.8 636.2
Tax-related separation costs   10.8
Tax benefit (5.3) (217.0)
Total transformation costs, net of tax benefit 15.5 430.0
Continuing Operations [Member]
    
Components Of Transformation Costs [Line Items]    
Transformation costs before income tax expense 13.0 396.1
Continuing Operations [Member] | Transformation Costs [Member]
    
Components Of Transformation Costs [Line Items]    
Loss on extinguishment of debt 1.0 296.8
Advisory fees 4.4  
Asset impairment   56.3
Information technology costs 1.7  
Employee retention and other compensation costs 2.3 36.8
Lease termination and other real estate costs 1.9 4.3
Other costs 1.7 1.9
Transformation costs before income tax expense 13.0 396.1
Tax-related separation costs   3.5
Tax benefit (4.4) (143.0)
Total transformation costs, net of tax benefit 8.6 256.6
Discontinued Operations [Member]
    
Components Of Transformation Costs [Line Items]    
Transformation costs before income tax expense 7.8 240.1
Discontinued Operations [Member] | Transformation Costs [Member]
    
Components Of Transformation Costs [Line Items]    
Advisory fees 6.4 139.4
Asset impairment   8.2
Information technology costs 0.9 46.3
Employee retention and other compensation costs   20.1
Lease termination and other real estate costs   9.8
Other costs 0.5 16.3
Transformation costs before income tax expense 7.8 240.1
Tax-related separation costs   7.3
Tax benefit (0.9) (74.0)
Total transformation costs, net of tax benefit $ 6.9 $ 173.4