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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  | 2 |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | $ 179,600 |  | $ 160,200 |  | $ 671,100 |  | $ 572,200 |  |
Operating Income |  |  |  |  |  |  |  |  |
Total operating income | 45,000 |  | 40,900 |  | 182,100 |  | 161,300 |  |
Other expense, net | 200 |  | 500 |  | 1,200 |  | 1,700 |  |
Interest | 18,200 |  | 17,100 |  | 54,100 |  | 50,900 |  |
Income Before Income Taxes | 27,000 |  | 24,300 |  | 129,200 |  | 112,100 |  |
Income taxes | 7,600 |  | 6,800 |  | 35,000 |  | 30,200 |  |
Net Income | 19,400 |  | 17,500 |  | 94,200 |  | 81,900 |  |
Identifiable Assets |  |  |  |  |  |  |  |  |
Total identifiable assets | 3,861,400 |  |  |  | 3,861,400 |  |  |  | $ 3,577,000
Cost of Sales | 42,400 |  | 38,200 |  | 208,700 |  | 159,100 |  |
Utilities Operating Expense, Maintenance and Operations | 59,700 |  | 54,600 |  | 184,000 |  | 170,000 |  |
Depreciation and amortization | 23,300 |  | 16,800 |  | 67,700 |  | 51,700 |  |
Segment Reporting, Other Segment Item, Amount | 9,200 | [1] | 9,700 | [1] | 28,600 | [2] | 30,100 | [2] |
Regulated natural gas and electric costs | 31,700 |  | 28,400 |  | 137,300 |  | 105,700 |  |
Unregulated Energy Cost of Sales | 18,300 |  | 15,800 |  | 93,400 |  | 70,900 |  |
Other Cost of Sales | (7,600) | [3] | (6,000) | [3] | (22,000) | [4] | (17,500) | [4] |
Payments to Acquire Productive Assets | 122,800 |  | 97,300 |  | 335,600 |  | 256,800 |  |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 0 | [5] | 0 | [5] | 0 | [6] | 0 | [6] |
Operating Revenues, Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 179,600 |  | 160,200 |  | 671,100 |  | 572,200 |  |
Regulated Energy [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 146,400 |  | 130,600 |  | 497,800 |  | 429,700 |  |
Operating Income |  |  |  |  |  |  |  |  |
Total operating income | 48,900 |  | 44,000 |  | 161,200 |  | 142,600 |  |
Identifiable Assets |  |  |  |  |  |  |  |  |
Total identifiable assets | 3,325,000 |  |  |  | 3,325,000 |  |  |  | 3,042,900
Utilities Operating Expense, Maintenance and Operations | 39,700 |  | 37,600 |  | 122,100 |  | 115,900 |  |
Depreciation and amortization | 18,200 |  | 12,300 |  | 52,600 |  | 39,500 |  |
Segment Reporting, Other Segment Item, Amount | 7,900 | [1] | 8,300 | [1] | 24,600 | [2] | 26,000 | [2] |
Payments to Acquire Productive Assets | 108,100 |  | 89,000 |  | 295,700 |  | 230,900 |  |
Regulated Energy [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 600 | [5] | 400 | [5] | 1,400 | [6] | 4,600 | [6] |
Regulated Energy [Member] | Operating Revenues, Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 145,800 |  | 130,200 |  | 496,400 |  | 425,100 |  |
Unregulated Energy [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 40,700 |  | 35,600 |  | 195,300 |  | 160,100 |  |
Operating Income |  |  |  |  |  |  |  |  |
Total operating income | (3,900) |  | (3,100) |  | 20,900 |  | 18,700 |  |
Identifiable Assets |  |  |  |  |  |  |  |  |
Total identifiable assets | 470,200 |  |  |  | 470,200 |  |  |  | 486,400
Utilities Operating Expense, Maintenance and Operations | 19,900 |  | 17,000 |  | 61,900 |  | 54,200 |  |
Depreciation and amortization | 5,100 |  | 4,500 |  | 15,100 |  |  |  |
Segment Reporting, Other Segment Item, Amount | 1,300 | [1] | 1,400 | [1] | 4,000 | [2] | 4,100 | [2] |
Payments to Acquire Productive Assets | 9,600 |  | 8,300 |  | 32,100 |  | 24,600 |  |
Unregulated Energy [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 6,900 | [5] | 5,600 | [5] | 20,600 | [6] | 13,000 | [6] |
Unregulated Energy [Member] | Operating Revenues, Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 33,800 |  | 30,000 |  | 174,700 |  | 147,100 |  |
Other [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | (7,500) | [3] | (6,000) | [3] | (22,000) | [4] | (17,600) | [4] |
Identifiable Assets |  |  |  |  |  |  |  |  |
Total identifiable assets | 66,200 |  |  |  | 66,200 |  |  |  | $ 47,700
Utilities Operating Expense, Maintenance and Operations | 100 | [3] | 0 | [3] | 0 | [4] | (100) | [4] |
Segment Reporting, Other Segment Item, Amount | 0 | [1],[3] | 0 | [1],[3] | 0 | [2],[4] | 0 | [2],[4] |
Other [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | (7,500) | [3],[5] | (6,000) | [3],[5] | (22,000) | [4],[6] | (17,600) | [4],[6] |
Other and eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |
Total operating income | 0 | [3] | 0 | [3] | 0 | [4] | 0 | [4] |
Other [Member] |  |  |  |  |  |  |  |  |
Identifiable Assets |  |  |  |  |  |  |  |  |
Payments to Acquire Productive Assets | 5,100 |  | $ 0 |  | 7,800 |  | 1,300 |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |
Net Income | $ 19,400 |  |  |  | $ 94,200 |  | $ 81,900 |  |
[1] | (3) Other segment items for each reportable segment include: Regulated - Other taxes and transaction and transition costs related to the integration of FCG; Unregulated - Other taxes
[2] | 3) Other segment items for each reportable segment include: Regulated - Other taxes and transaction and transition costs related to the integration of FCG; Unregulated - Other taxes.
[3] | (1) Other revenues and other operating income (loss) amounts are attributable to eliminations and unregulated subsidiaries that own real estate leased to the Company.
[4] | (1) Other revenues and other operating income (loss) amounts are attributable to eliminations and unregulated subsidiaries that own real estate leased to the Company.
[5] | (2) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.
[6] | (2) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.

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