Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Payments Under Base Arrangements and Renewal Options

The future minimum payments under the base agreements, as well as the renewal options for each arrangement which the Company expects to exercise, are as follows:

(dollars in millions)
Year ended December 31,
2024	$	5.8
2025		5.8
2026		5.8
2027		5.8
2028		4.3
Thereafter		36.0
Total future minimum financing obligation payments		63.5
Less imputed interest		(16.9	)
Total	$	46.6

Schedule of Change in Asset Retirement Obligation

The following table presents the activity for the Company’s asset retirement obligations:

	Year Ended			Year Ended
(dollars in millions)	December 31, 2023			December 31, 2022
Balance, beginning of period	$	7.2		$	7.3
Liabilities incurred		—			—
Liabilities settled		(0.2	)		(0.4	)
Accretion expense		0.3			0.3
Balance, end of period	$	7.3		$	7.2