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Long-Term Debt (Summary of Long Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of Long-term debt    
Other Long-term Debt $ 3.8 $ 5.2
Finance lease obligation, at a fixed interest rate, interest and principal payments monthly through January 2027 2.7 42.4
Less unamortized debt issuance costs [1] (18.4) (15.8)
Less unamortized discounts (2.9) (3.9)
Total long-term debt 1,211.3 1,604.5
Less current portion of long-term debt 1.8 3.8
Long-term Debt, Excluding Current Maturities 1,209.5 1,600.7
Senior Notes [Abstract]    
Accumulated amortization, deferred debt issuance costs 15.7 23.5
Fair Value Hedging | Interest Expense    
Senior Notes [Abstract]    
Liabilities, Fair Value Adjustment $ 1.1 $ 1.6
Revolving Credit Facility    
Senior Notes [Abstract]    
Effective Interest Rate Percentage 4.30% 6.00%
6.50% Notes    
Summary of Long-term debt    
Borrowings under Senior Notes $ 0.0 $ 900.0
Senior Notes [Abstract]    
Stated Interest Rate Percentage   6.50%
Effective Interest Rate Percentage   6.80%
7.625% Notes    
Summary of Long-term debt    
Borrowings under Senior Notes [2] $ 351.1 $ 351.6
Senior Notes [Abstract]    
Stated Interest Rate Percentage 7.625% 7.625%
Effective Interest Rate Percentage 8.11% 8.00%
7.75% Notes    
Summary of Long-term debt    
Borrowings under Senior Notes $ 325.0 $ 325.0
Senior Notes [Abstract]    
Stated Interest Rate Percentage 7.75% 7.75%
Effective Interest Rate Percentage 8.00% 8.00%
11.00% Notes    
Summary of Long-term debt    
Borrowings under Senior Notes $ 550.0 $ 0.0
Senior Notes [Abstract]    
Stated Interest Rate Percentage 11.00%  
Effective Interest Rate Percentage 11.20%  
[1] Deferred debt issuance costs are being amortized by the effective interest rate method over the lives of the related debt instruments. These amounts are net of accumulated amortization of $15.7 million and $23.5 million at December 31, 2019 and 2018, respectively.
[2] The balance includes a fair value interest rate hedge adjustment, which increased the debt balance by $1.1 million and $1.6 million as of December 31, 2019 and 2018, respectively.