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Fair Value Measurements (Reconciliation of Fair Value Using Significant Unobservable Inputs ) (Details) (Convertible Preferred Stock [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Convertible Preferred Stock [Member]
    
Beginning balance $ 78.2  
Issuances   75.0
Paid-in-kind dividends issued 10.1 0.8
Less: paid-in-kind dividends payable, beginning balance (2.4)  
Paid-in-kind dividends payable 2.7 2.4
Transfer out of Level 3 (88.6)  
Ending balance   $ 78.2