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Condensed Debtor-in-Possession Financial Information Components of Liabilities Subject to Compromise (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Liabilities Subject to Compromise [Line Items]    
Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities $ 1.5  
Liabilities Subject to Compromise, 3% Convertible Senior Notes and Accrued Interest 538.2  
Liabilities Subject to Compromise, Convertible Preferred Stock and Paid-in-Kind Dividends Payable 113.9  
Liabilities Subject to Compromise 653.6 0
Parent [Member]
    
Liabilities Subject to Compromise [Line Items]    
Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities 1.5  
Liabilities Subject to Compromise, 3% Convertible Senior Notes and Accrued Interest 538.2  
Liabilities Subject to Compromise, Convertible Preferred Stock and Paid-in-Kind Dividends Payable 113.9  
Intercompany Services Payable 203.1  
Intercompany Loan Payable 144.1  
Liabilities Subject to Compromise $ 1,000.8