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Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Components of Long-term Debt Long-term debt is comprised of the following:
As of December 31,20212020
6.875% senior secured notes due November 1, 2027 (Face value of $485.0 million less unamortized issuance costs of $6.9 million and $8.1 million at December 31, 2021 and 2020, respectively)
$478.1 $476.9 
5.50% convertible senior notes (Face value of $84.2 million less unamortized discount and issuance costs of $0.6 million at December 31, 2020)
— 83.6 
Finance leases2.7 5.5 
Other debt48.6 63.9 
Total529.4 629.9 
Less – current maturities18.2 102.8 
Total long-term debt$511.2 $527.1 
Schedule of Estimated Fair Values of Long-term Debt Presented below are the estimated fair values of long-term debt.
As of December 31,20212020
6.875% senior secured notes due November 1, 2027
$527.0 $532.3 
5.50% convertible senior notes due March 1, 2021
— 169.8 
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
2022$18.2 $16.6 $1.6 
202317.0 16.3 0.7 
202410.3 9.9 0.4 
20253.0 3.0 — 
20261.9 1.9 — 
Thereafter479.0 479.0 — 
Total$529.4 $526.7 $2.7 
Schedule of Interest Expense Cash paid for interest and capitalized interest expense was as follows:
Year ended December 31,202120202019
Cash paid for interest$40.1 $32.9 $61.5 
Capitalized interest expense$4.5 $4.6 $6.6 
Interest expense related to the 2027 Notes is comprised of the following:
Year ended December 31,20212020
Contractual interest coupon$33.3 $5.7 
Amortization of issuance costs1.2 0.2 
Total$34.5 $5.9 
Interest expense related to the 2022 Notes is comprised of the following:
Year ended December 31,20202019
Contractual interest coupon$13.8 $47.3 
Amortization of issuance costs0.7 2.4 
Total$14.5 $49.7 
Interest expense related to the 2021 Notes is comprised of the following:
Year ended December 31,202120202019
Contractual interest coupon$0.8 $4.6 $8.9 
Amortization of debt discount0.5 3.1 5.5 
Amortization of debt issuance costs0.1 0.5 0.9 
Total$1.4 $8.2 $15.3