Derivative Instruments - Narrative (Details)	9 Months Ended					12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) Bcf	Sep. 30, 2022 USD ($) MBbls	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) Bcf	Dec. 31, 2021 USD ($) MBbls	Jun. 30, 2020 USD ($)
Derivative Instruments, Gain (Loss)
Maximum additional collateral as percentage of derivative liability				100.00%
Aggregate fair value of derivative instruments with credit-risk related contingencies	$ 679,500,000	$ 679,500,000	$ 679,500,000	$ 679,500,000		$ 594,900,000	$ 594,900,000
Collateral posted	142,700,000	142,700,000	142,700,000	142,700,000		100,000	100,000
Derivative instruments, at fair value	1,466,800,000	1,466,800,000	1,466,800,000	1,466,800,000		543,337,000	543,337,000
Disposal Group, Not Discontinued Operations | 2020 Divestiture
Derivative Instruments, Gain (Loss)
Potential contingent consideration								$ 20,000,000
Derivative instruments, at fair value	2,000,000	2,000,000	2,000,000	2,000,000		8,200,000	8,200,000
Contingent consideration received	6,500,000				$ 5,600,000
OTC Derivative Instrument Contracts
Derivative Instruments, Gain (Loss)
Aggregate fair value of derivative instruments with credit-risk related contingencies	0	0	0	0		0	0
Commodity derivatives
Derivative Instruments, Gain (Loss)
Derivative instruments, at fair value	1,466,800,000	1,466,800,000	1,466,800,000	1,466,800,000		543,337,000	543,337,000
Exchange traded natural gas contracts
Derivative Instruments, Gain (Loss)
Collateral posted	45,200,000	45,200,000	45,200,000	45,200,000		147,700,000	147,700,000
Henry hub cash bonus
Derivative Instruments, Gain (Loss)
Derivative liability	$ 53,000,000	$ 53,000,000	$ 53,000,000	$ 53,000,000		$ 111,000,000	$ 111,000,000
Cash flow hedging | Commodity derivatives
Derivative Instruments, Gain (Loss)
Volume of derivative instruments (in Bcf, Mbbls)		1,587	1,517			2,184	3,055