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Long-term Debt (Tables)
 6 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company’s total indebtedness as of June 30, 2024 and December 31, 2023 consisted of the following:
Debt Instrument (defined below, as applicable)June 30, 2024December 31, 2023
(Dollars in millions)
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
$320.0 $320.0 
Finance lease obligations24.5 22.3 
Less: Debt issuance costs(7.2)(8.1)
337.3 334.2 
Less: Current portion of long-term debt14.1 13.5 
Long-term debt$323.2 $320.7 
Schedule of Interest Charges Additionally, the table sets forth the amount of cash paid for interest, net of capitalized interest and the amount of non-cash interest expense primarily related to the amortization of debt issuance costs.
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
 (Dollars in millions)
2028 Convertible Notes$2.6 $2.6 $5.2 $5.2 
Finance lease obligations0.5 0.4 0.9 0.9 
Financial assurance instruments6.1 8.0 14.9 20.0 
Amortization of debt issuance costs2.0 0.7 3.2 2.3 
Capitalized interest(1.7)— (1.7)— 
Other1.2 1.6 2.9 3.3 
Interest expense, net of capitalized interest$10.7 $13.3 $25.4 $31.7 
Cash paid for interest, net of capitalized interest$12.6 $22.9 $24.1 $41.9 
Non-cash interest expense$1.9 $1.7 $3.2 $3.3