Debt - Mountaineer Credit Agreement (Details) - Mountaineer - USD ($)	Oct. 20, 2022	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Borrowings (up to)		$ 100,000,000	$ 100,000,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Borrowings (up to)		$ 20,000,000
Mountaineer Credit Agreement | Line of Credit | Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Borrowings (up to)	$ 150,000,000
Option to increase capacity	250,000,000
Mountaineer Credit Agreement | Line of Credit | Letter of Credit | Subsequent Event
Debt Instrument [Line Items]
Borrowings (up to)	$ 20,000,000