Business Segments - Schedule of Segment Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue from contracts with customers	$ 669,600,000	$ 753,200,000	$ 801,000,000.0	$ 794,800,000	$ 842,200,000	$ 953,800,000	$ 812,900,000	$ 840,000,000.0	$ 3,018,598,000	$ 3,448,854,000	$ 4,220,140,000
Gain on sales of assets and other operating income									9,900,000	11,300,000	(287,500,000)
Total revenues and other income									3,028,474,000	3,460,147,000	3,932,662,000
Lease operating expenses and taxes other than income									649,700,000	678,900,000	607,600,000
Repair and maintenance									68,500,000	58,200,000	39,600,000
Workovers									218,800,000	47,300,000	32,100,000
Total lease operating expenses									936,960,000	784,391,000	679,342,000
Severance and ad valorem taxes									39,162,000	42,787,000	57,012,000
Transportation, gathering and processing									210,827,000	232,985,000	212,711,000
Costs of purchased natural gas									3,147,000	51,682,000	171,991,000
Selling and general expenses									112,900,000	118,900,000	133,300,000
Geological and geophysical									27,200,000	26,100,000	10,500,000
Dry holes and previously suspended exploration costs									73,200,000	169,800,000	82,100,000
Other exploratory costs, including undeveloped lease amortization and delay lease rentals									33,100,000	38,900,000	40,600,000
Exploration Expenses									133,538,000	234,776,000	133,197,000
Depreciation, depletion and amortization									865,800,000	861,500,000	776,800,000
Impairment of assets	28,400,000			34,500,000					62,909,000	0	0
Accretion of asset retirement obligations									52,511,000	46,059,000	46,243,000
Other operating expenses									11,000,000.0	39,300,000	59,200,000
Loss on contingent consideration									0	7,113,000	78,285,000
Total other operating expenses										(46,400,000)	(137,500,000)
Interest Income									(34,200,000)	(12,600,000)	(2,800,000)
Interest expense, net of capitalization									105,926,000	112,373,000	150,759,000
Current income tax expense									5,800,000	16,200,000	23,400,000
Deferred income tax expense									72,500,000	179,800,000	286,100,000
Total income tax expense									78,300,000	196,000,000.0	309,500,000
Other segment items									(36,700,000)	21,000,000.0	(11,500,000)
Net income including noncontrolling interest	64,400,000	$ 151,100,000	$ 156,300,000	$ 114,700,000	139,700,000	$ 277,800,000	$ 91,900,000	$ 214,300,000	486,485,000	723,681,000	1,138,719,000
Additions to property, plant, equipment									840,600,000	914,800,000	1,063,300,000
Total assets at year-end	9,667,479,000				9,766,697,000				9,667,479,000	9,766,697,000	10,309,000,000
Revenue from production
Segment Reporting Information [Line Items]
Revenue from contracts with customers									3,014,856,000	3,376,639,000	4,038,451,000
Sales of purchased natural gas
Segment Reporting Information [Line Items]
Revenue from contracts with customers									3,742,000	72,215,000	181,689,000
Operating Segments
Segment Reporting Information [Line Items]
Gain on sales of assets and other operating income									6,000,000.0	8,000,000.0	26,900,000
Total revenues and other income									3,024,600,000	3,456,800,000	4,247,100,000
Lease operating expenses and taxes other than income									649,700,000	678,900,000	607,600,000
Repair and maintenance									68,500,000	58,200,000	39,600,000
Workovers									218,800,000	47,300,000	32,100,000
Total lease operating expenses									937,000,000.0	784,400,000	679,300,000
Severance and ad valorem taxes									39,200,000	42,800,000	57,000,000.0
Transportation, gathering and processing									210,800,000	233,000,000.0	212,700,000
Costs of purchased natural gas									3,100,000	51,700,000	172,000,000.0
Selling and general expenses									23,800,000	37,700,000	44,500,000
Geological and geophysical									27,200,000	26,100,000	10,500,000
Dry holes and previously suspended exploration costs									73,200,000	169,800,000	82,100,000
Other exploratory costs, including undeveloped lease amortization and delay lease rentals									33,100,000	38,900,000	40,600,000
Exploration Expenses									133,500,000	234,800,000	133,200,000
Depreciation, depletion and amortization									856,900,000	850,500,000	763,900,000
Impairment of assets									62,900,000
Accretion of asset retirement obligations									52,400,000	46,000,000.0	46,200,000
Other operating expenses									14,200,000	43,700,000	54,200,000
Loss on contingent consideration										7,100,000	78,300,000
Total other operating expenses										(50,800,000)	(132,500,000)
Interest Income									(22,000,000.0)	(3,300,000)	(300,000)
Interest expense, net of capitalization									800,000	500,000	400,000
Current income tax expense									4,900,000	7,400,000	19,200,000
Deferred income tax expense									101,400,000	230,400,000	398,100,000
Total income tax expense									106,300,000	237,800,000	417,300,000
Other segment items									7,300,000	8,900,000	9,300,000
Net income including noncontrolling interest									598,400,000	881,200,000	1,579,100,000
Additions to property, plant, equipment									811,400,000	890,600,000	1,041,400,000
Total assets at year-end	9,175,600,000				9,400,200,000				9,175,600,000	9,400,200,000	9,273,600,000
Operating Segments | United States
Segment Reporting Information [Line Items]
Gain on sales of assets and other operating income									4,500,000	6,500,000	25,500,000
Total revenues and other income									2,508,300,000	2,928,300,000	3,461,200,000
Lease operating expenses and taxes other than income									471,300,000	532,300,000	458,200,000
Repair and maintenance									63,700,000	53,200,000	34,900,000
Workovers									214,900,000	45,200,000	29,600,000
Total lease operating expenses									749,900,000	630,700,000	522,700,000
Severance and ad valorem taxes									37,800,000	41,400,000	55,700,000
Transportation, gathering and processing									130,900,000	157,000,000.0	142,200,000
Costs of purchased natural gas									0	0	200,000
Selling and general expenses									(3,300,000)	11,800,000	20,400,000
Geological and geophysical									14,400,000	6,600,000	8,300,000
Dry holes and previously suspended exploration costs									70,900,000	153,100,000	23,000,000.0
Other exploratory costs, including undeveloped lease amortization and delay lease rentals									10,900,000	14,900,000	16,200,000
Exploration Expenses									96,200,000	174,600,000	47,500,000
Depreciation, depletion and amortization									709,200,000	706,000,000.0	617,000,000.0
Impairment of assets									62,900,000
Accretion of asset retirement obligations									43,100,000	37,800,000	36,500,000
Other operating expenses									9,300,000	20,100,000	41,300,000
Loss on contingent consideration										7,100,000	78,300,000
Total other operating expenses										(27,200,000)	(119,600,000)
Interest Income									(22,000,000.0)	(3,300,000)	(300,000)
Interest expense, net of capitalization									200,000	100,000	100,000
Current income tax expense									1,500,000	3,100,000	8,100,000
Deferred income tax expense									123,800,000	229,600,000	362,700,000
Total income tax expense									125,300,000	232,700,000	370,800,000
Other segment items									6,900,000	7,200,000	6,900,000
Net income including noncontrolling interest									561,900,000	905,100,000	1,521,900,000
Additions to property, plant, equipment									601,700,000	671,300,000	838,600,000
Total assets at year-end	6,953,800,000				7,107,000,000				6,953,800,000	7,107,000,000	6,930,600,000
Operating Segments | Canada
Segment Reporting Information [Line Items]
Gain on sales of assets and other operating income									1,500,000	1,500,000	1,400,000
Total revenues and other income									509,700,000	517,500,000	762,900,000
Lease operating expenses and taxes other than income									176,800,000	144,700,000	147,900,000
Repair and maintenance									4,800,000	5,000,000.0	4,700,000
Workovers									3,900,000	2,100,000	2,500,000
Total lease operating expenses									185,500,000	151,800,000	155,100,000
Severance and ad valorem taxes									1,400,000	1,400,000	1,300,000
Transportation, gathering and processing									79,900,000	76,000,000.0	70,500,000
Costs of purchased natural gas									3,100,000	51,700,000	171,800,000
Selling and general expenses									20,400,000	16,500,000	21,900,000
Geological and geophysical									200,000	100,000	400,000
Dry holes and previously suspended exploration costs									0	0	0
Other exploratory costs, including undeveloped lease amortization and delay lease rentals									300,000	400,000	700,000
Exploration Expenses									500,000	500,000	1,100,000
Depreciation, depletion and amortization									146,000,000.0	142,200,000	141,500,000
Impairment of assets									0
Accretion of asset retirement obligations									8,600,000	7,800,000	9,600,000
Other operating expenses									2,800,000	15,500,000	10,500,000
Loss on contingent consideration										0	0
Total other operating expenses										(15,500,000)	(10,500,000)
Interest Income									0	0	0
Interest expense, net of capitalization									400,000	200,000	0
Current income tax expense									3,200,000	3,700,000	8,800,000
Deferred income tax expense									8,800,000	7,500,000	34,800,000
Total income tax expense									12,000,000.0	11,200,000	43,600,000
Other segment items									100,000	1,100,000	1,800,000
Net income including noncontrolling interest									49,000,000.0	41,600,000	134,200,000
Additions to property, plant, equipment									137,900,000	206,200,000	208,500,000
Total assets at year-end	1,919,800,000				2,080,000,000				1,919,800,000	2,080,000,000	2,125,600,000
Operating Segments | Other
Segment Reporting Information [Line Items]
Gain on sales of assets and other operating income									0	0	0
Total revenues and other income									6,600,000	11,000,000.0	23,000,000.0
Lease operating expenses and taxes other than income									1,600,000	1,900,000	1,500,000
Repair and maintenance									0	0	0
Workovers									0	0	0
Total lease operating expenses									1,600,000	1,900,000	1,500,000
Severance and ad valorem taxes									0	0	0
Transportation, gathering and processing									0	0	0
Costs of purchased natural gas									0	0	0
Selling and general expenses									6,700,000	9,400,000	2,200,000
Geological and geophysical									12,600,000	19,400,000	1,800,000
Dry holes and previously suspended exploration costs									2,300,000	16,700,000	59,100,000
Other exploratory costs, including undeveloped lease amortization and delay lease rentals									21,900,000	23,600,000	23,700,000
Exploration Expenses									36,800,000	59,700,000	84,600,000
Depreciation, depletion and amortization									1,700,000	2,300,000	5,400,000
Impairment of assets									0
Accretion of asset retirement obligations									700,000	400,000	100,000
Other operating expenses									2,100,000	8,100,000	2,400,000
Loss on contingent consideration										0	0
Total other operating expenses										(8,100,000)	(2,400,000)
Interest Income									0	0	0
Interest expense, net of capitalization									200,000	200,000	300,000
Current income tax expense									200,000	600,000	2,300,000
Deferred income tax expense									(31,200,000)	(6,700,000)	600,000
Total income tax expense									(31,000,000.0)	(6,100,000)	2,900,000
Other segment items									300,000	600,000	600,000
Net income including noncontrolling interest									(12,500,000)	(65,500,000)	(77,000,000.0)
Additions to property, plant, equipment									71,800,000	13,100,000	(5,700,000)
Total assets at year-end	302,000,000.0				213,300,000				302,000,000.0	213,300,000	217,400,000
Operating Segments | Revenue from production
Segment Reporting Information [Line Items]
Revenue from contracts with customers									3,014,900,000	3,376,600,000	4,038,500,000
Operating Segments | Revenue from production | United States
Segment Reporting Information [Line Items]
Revenue from contracts with customers									2,503,800,000	2,921,800,000	3,435,500,000
Operating Segments | Revenue from production | Canada
Segment Reporting Information [Line Items]
Revenue from contracts with customers									504,500,000	443,800,000	580,000,000.0
Operating Segments | Revenue from production | Other
Segment Reporting Information [Line Items]
Revenue from contracts with customers									6,600,000	11,000,000.0	23,000,000.0
Operating Segments | Sales of purchased natural gas
Segment Reporting Information [Line Items]
Revenue from contracts with customers									3,700,000	72,200,000	181,700,000
Operating Segments | Sales of purchased natural gas | United States
Segment Reporting Information [Line Items]
Revenue from contracts with customers									0	0	200,000
Operating Segments | Sales of purchased natural gas | Canada
Segment Reporting Information [Line Items]
Revenue from contracts with customers									3,700,000	72,200,000	181,500,000
Operating Segments | Sales of purchased natural gas | Other
Segment Reporting Information [Line Items]
Revenue from contracts with customers									0	0	0
Corporate and Other
Segment Reporting Information [Line Items]
Gain on sales of assets and other operating income									3,900,000	3,300,000	(314,400,000)
Total revenues and other income									3,900,000	3,300,000	(314,400,000)
Lease operating expenses and taxes other than income									0	0	0
Repair and maintenance									0	0	0
Workovers									0	0	0
Total lease operating expenses									0	0	0
Severance and ad valorem taxes									0	0	0
Transportation, gathering and processing									0	0	0
Costs of purchased natural gas									0	0	0
Selling and general expenses									89,100,000	81,200,000	88,800,000
Geological and geophysical									0	0	0
Dry holes and previously suspended exploration costs									0	0	0
Other exploratory costs, including undeveloped lease amortization and delay lease rentals									0	0	0
Exploration Expenses									0	0	0
Depreciation, depletion and amortization									8,900,000	11,000,000.0	12,900,000
Impairment of assets									0
Accretion of asset retirement obligations									100,000	100,000	0
Other operating expenses									(3,200,000)	(4,400,000)	5,000,000.0
Loss on contingent consideration										0	0
Total other operating expenses										4,400,000	(5,000,000.0)
Interest Income									(12,200,000)	(9,300,000)	(2,500,000)
Interest expense, net of capitalization									105,100,000	111,900,000	150,400,000
Current income tax expense									900,000	8,800,000	4,200,000
Deferred income tax expense									(28,900,000)	(50,600,000)	(112,000,000.0)
Total income tax expense									(28,000,000.0)	(41,800,000)	(107,800,000)
Other segment items									(44,000,000.0)	12,100,000	(20,800,000)
Net income including noncontrolling interest									(111,900,000)	(157,500,000)	(440,400,000)
Additions to property, plant, equipment									29,200,000	24,200,000	21,900,000
Total assets at year-end	$ 491,900,000				$ 366,500,000				491,900,000	366,500,000	1,035,400,000
Corporate and Other | Revenue from production
Segment Reporting Information [Line Items]
Revenue from contracts with customers									0	0	0
Corporate and Other | Sales of purchased natural gas
Segment Reporting Information [Line Items]
Revenue from contracts with customers									$ 0	$ 0	$ 0