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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Components of Long-Term Debt Long-term debt is comprised of the following:
As of December 31,20202019
6.875% senior secured notes due November 1, 2027 (Face value of $485.0 million less unamortized issuance costs of $8.1 million at December 31, 2020)
$476.9 $— 
5.50% convertible senior notes due March 1, 2021 (Face value of $84.2 million less unamortized discount and issuance costs of $0.6 million and $4.2 million at December 31, 2020 and 2019, respectively)
83.6 80.0 
10.75% senior secured notes ($440.0 million face value less unamortized issuance costs of $5.5 million at December 31, 2019)
— 434.5 
Finance leases5.5 5.3 
Other debt63.9 59.6 
Total629.9 579.4 
Less – current maturities102.8 13.5 
Total long-term debt$527.1 $565.9 
Estimated Fair Values of Long-term Debt Presented below are the estimated fair values of long-term debt.
As of December 31,20202019
6.875% senior secured notes due November 1, 2027
$532.3 $— 
5.50% convertible senior notes due March 1, 2021
169.8 115.8 
10.75% senior secured notes
— 474.2 
Schedule of Maturities of Long-term Debt, Including Finance Leases Maturities of long-term debt, including finance leases, in each of the next five years and thereafter are as follows:
YearTotalLong-Term DebtFinance Leases
2021$102.8 $100.4 $2.4 
202218.2 16.2 2.0 
202316.5 15.8 0.7 
20249.8 9.4 0.4 
20252.8 2.8 — 
Thereafter479.8 479.8 — 
Total$629.9 $624.4 $5.5 
Schedule of Cash Paid for Interest, Capitalized Interest, and Interest Expense Cash paid for interest and capitalized interest expense was as follows:
Year ended December 31,202020192018
Cash paid for interest$32.9 $61.5 $59.5 
Capitalized interest expense$4.6 $6.6 $6.0 
Interest expense related to the 2027 Notes is comprised of the following:
Year ended December 31,2020
Contractual interest coupon$5.7 
Amortization of issuance costs0.2 
Total$5.9 
Interest expense related to the 2022 Notes is comprised of the following:
Year ended December 31,202020192018
Contractual interest coupon$13.8 $47.3 $47.3 
Amortization of issuance costs0.7 2.4 2.4 
Total$14.5 $49.7 $49.7 
Interest expense related to the 2021 Notes is comprised of the following:
Year ended December 31,202020192018
Contractual interest coupon$4.6 $8.9 $11.8 
Amortization of debt discount3.1 5.5 6.6 
Amortization of debt issuance costs0.5 0.9 1.2 
Total$8.2 $15.3 $19.6