Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2022

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,
2023	$	6.1
2024		5.8
2025		5.8
2026		5.8
2027		5.8
Thereafter		40.3
Total future minimum financing obligation payments		69.6
Less imputed interest		(19.5	)
Total	$	50.1

Schedule of Change in Asset Retirement Obligation

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

	Successor			Successor			Predecessor
	Year Ended			September 8, 2021 to			January 1, 2021 to
(dollars in millions)	December 31, 2022			December 31, 2021			September 7, 2021
Balance, beginning of period	$	7.3		$	7.3		$	6.7
Liabilities incurred		—			—			0.4
Liabilities settled		(0.4	)		(0.1	)		—
Accretion expense		0.3			0.1			0.2
Balance, end of period	$	7.2		$	7.3		$	7.3