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Acquisitions (Details) - USD ($) $ in Millions				6 Months Ended
Acquisitions (Details) - USD ($) $ in Millions	Apr. 01, 2022	Jan. 14, 2022	May 07, 2021	Dec. 31, 2021
Barnett Shale
Acquisitions
Asset acquisition, consideration transferred			$ 17.4
Liabilities acquired			$ 2.8
Downward purchase adjustment				$ 0.9
Jonah Field In Wyoming From Exaro Energy III, LLC
Acquisitions
Asset acquisition of transaction cost	$ 0.2
Asset acquisition, consideration transferred related to deposits transferred	1.6
Liabilities acquired	3.0
Jonah Field In Wyoming From Exaro Energy III, LLC \| Oil and natural gas properties
Acquisitions
Asset acquisition, consideration transferred	26.4
Jonah Field In Wyoming From Exaro Energy III, LLC \| Other assets, net
Acquisitions
Asset acquisition for deposits	1.2
Williston Basin Acquisition
Acquisitions
Asset acquisition, consideration transferred		$ 25.2
Asset acquisition of transaction cost		0.3
Liabilities acquired		2.4
Senior Secured Reserve-Based Credit Facility \| Jonah Field In Wyoming From Exaro Energy III, LLC
Acquisitions
Borrowings under credit facility	$ 17.0
Senior Secured Reserve-Based Credit Facility \| Williston Basin Acquisition
Acquisitions
Borrowings under credit facility		$ 16.0