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Fair Value of Debt (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Revolving Credit Facility [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Line of Credit Facility, Amount Outstanding $ 0.0 $ 0.0
Revolving Credit Facility [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Line of Credit Facility, Amount Outstanding 0.0 0.0
7.75% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 200.0 200.0
7.75% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 218.0 218.5
6.625% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 550.0 550.0
6.625% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 569.3 574.8
6.25% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 400.0 400.0
6.25% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 412.0 415.0
5.125% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 200.0 200.0
5.125% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable $ 201.5 $ 202.0