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Fair Value Fair Value of Debt (Details) (Fair Value, Inputs, Level 2 [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Reported Value Measurement [Member] | Line of Credit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt $ 0 $ 0
Reported Value Measurement [Member] | Loans Payable [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 150.0 0
Reported Value Measurement [Member] | 9.25% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 337.5
Reported Value Measurement [Member] | 7.875% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 300.0
Reported Value Measurement [Member] | 7.75% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 200.0 200.0
Reported Value Measurement [Member] | 6.625% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 550.0 550.0
Reported Value Measurement [Member] | 6.25% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 400.0 0
Reported Value Measurement [Member] | 5.125% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 200.0 0
Estimate of Fair Value Measurement [Member] | Line of Credit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 0
Estimate of Fair Value Measurement [Member] | Loans Payable [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 147.8 0
Estimate of Fair Value Measurement [Member] | 9.25% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 377.4
Estimate of Fair Value Measurement [Member] | 7.875% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 310.1
Estimate of Fair Value Measurement [Member] | 7.75% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 227.5 216.5
Estimate of Fair Value Measurement [Member] | 6.625% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 578.9 555.5
Estimate of Fair Value Measurement [Member] | 6.25% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 423.0 0
Estimate of Fair Value Measurement [Member] | 5.125% Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt $ 206.0 $ 0