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Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The Company’s total indebtedness as of December 31, 2023 and 2022 consisted of the following:

			December 31,
Debt Instrument (defined below, as applicable)			2023						2022
			(Dollars in millions)
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)			$	320.0					$	320.0
Finance lease obligations			22.3						23.6
Less: Debt issuance costs			(8.1)						(9.8)
			334.2						333.8
Less: Current portion of long-term debt			13.5						13.2
Long-term debt			$	320.7					$	320.6

Interest Income and Interest Expense Disclosure

Additionally, the table sets forth the amount of cash paid for interest and the amount of non-cash interest expense primarily related to the amortization of debt issuance costs.

			Year Ended December 31,
			2023						2022						2021
			(Dollars in millions)
Indebtedness			$	21.6					$	87.0					$	132.3
Financial assurance instruments			38.2						53.3						51.1
Interest expense			$	59.8					$	140.3					$	183.4
Cash paid for interest			$	61.9					$	118.5					$	174.9
Non-cash interest expense			$	4.6					$	17.7					$	21.3

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Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities.

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Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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