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Business Segments - Schedule of Segment Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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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

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