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Fair Value Measurements Unobservable Inputs Rollforward (Details) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2010
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2011
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2011
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Long-lived assets held and used  $ 82.6$ 0$ 0 $ 0$ 0 $ 0
Long-lived assets held for sale  52.757.900  00
Total  135.357.90052.757.982.60
The amount of total losses for the period included in net loss attributable to the fair value of changes in assets still held00        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance11.626.3        
Total realized/unrealized gains (losses) Included in other comprehensive income(7.2)10.3        
Sale of ARS(15.0)         
Investment income11.1         
Ending balance$ 0.5$ 36.6