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Long-Term Debt (Summary of Long Term Debt) (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Summary of long-term debt
Long-term debt consisted of the following (in millions):
 
December 31,
2019
 
December 31,
2018
Borrowings under amended and restated senior secured revolving credit agreement with third-party lenders, interest payments quarterly, borrowings due February 2023, weighted average interest rates of 4.3% and 6.0% at December 31, 2019 and 2018, respectively
$
—

 
$
—

Borrowings under 2021 Notes, interest at a fixed rate of 6.5%, interest payments semiannually, borrowings due April 2021, effective interest rate of 6.8% for each year ended December 31, 2019 and 2018
—

 
900.0

Borrowings under 2022 Notes, interest at a fixed rate of 7.625%, interest payments semiannually, borrowings due January 2022, effective interest rate of 8.1% and 8.0% for the year ended December 31, 2019 and December 31, 2018, respectively (1)
351.1

 
351.6

Borrowings under 2023 Notes, interest at a fixed rate of 7.75%, interest payments semiannually, borrowings due April 2023, effective interest rate of 8.1% and 8.0% for the year ended December 31, 2019 and December 31, 2018, respectively
325.0

 
325.0

Borrowings under 2025 Notes, interest at a fixed rate of 11.0%, interest payments semiannually, borrowings due April 2025, effective interest rate of 11.2% for the year ended December 31, 2019
550.0

 
—

Other
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 (2)
(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

 
$
1,209.5

 
$
1,600.7


 
(1) 
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.
(2) 
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.