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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following tables depict the disaggregation of revenue, including intercompany revenue, from contracts with customers by customer type and timing of revenue recognition for each of the reportable segments for the three and nine months ended September 30, 2025, and 2024. Sales tax and other similar taxes are excluded from revenues.
Three Months Ended September 30, 2025 | Electric Utilities |  | Gas Utilities |  | Inter-segment Eliminations |  | Total |
Customer types: | (in millions) |
Retail | $ | 201.3 |  | $ | 128.6 |  | $ | — |  | $ | 329.9 |
Transportation |  | — |  |  | 43.6 |  |  | (0.1 | ) |  | 43.5 |
Wholesale |  | 5.5 |  |  | — |  |  | — |  |  | 5.5 |
Market - off-system sales |  | 16.3 |  |  | — |  |  | — |  |  | 16.3 |
Transmission |  | 11.1 |  |  | 0.1 |  |  | — |  |  | 11.2 |
Other revenues |  | 14.6 |  |  | 10.2 |  |  | (3.8 | ) |  | 21.0 |
Revenue from contracts with customers | $ | 248.8 |  | $ | 182.5 |  | $ | (3.9 | ) | $ | 427.4 |
Alternative revenue and other |  | 0.9 |  |  | 1.9 |  |  | — |  |  | 2.8 |
Total revenues | $ | 249.7 |  | $ | 184.4 |  | $ | (3.9 | ) | $ | 430.2 |
Timing of revenue recognition: |  |  |  |  |  |  |  |
Services transferred at a point in time | $ | 8.8 |  | $ | — |  | $ | — |  | $ | 8.8 |
Services transferred over time |  | 240.0 |  |  | 182.5 |  |  | (3.9 | ) |  | 418.6 |
Revenue from contracts with customers | $ | 248.8 |  | $ | 182.5 |  | $ | (3.9 | ) | $ | 427.4 |
Three Months Ended September 30, 2024 | Electric Utilities |  | Gas Utilities |  | Inter-segment Eliminations |  | Total |
Customer types: | (in millions) |
Retail | $ | 186.3 |  | $ | 117.5 |  | $ | — |  | $ | 303.8 |
Transportation |  | — |  |  | 43.2 |  |  | — |  |  | 43.2 |
Wholesale |  | 6.1 |  |  | — |  |  | — |  |  | 6.1 |
Market - off-system sales |  | 10.7 |  |  | — |  |  | — |  |  | 10.7 |
Transmission |  | 13.6 |  |  | — |  |  | — |  |  | 13.6 |
Other revenues |  | 14.9 |  |  | 10.8 |  |  | (4.5 | ) |  | 21.2 |
Revenue from contracts with customers | $ | 231.6 |  | $ | 171.5 |  | $ | (4.5 | ) | $ | 398.6 |
Alternative revenue and other |  | 0.9 |  |  | 2.1 |  |  | — |  |  | 3.0 |
Total revenues | $ | 232.5 |  | $ | 173.6 |  | $ | (4.5 | ) | $ | 401.6 |
Timing of revenue recognition: |  |  |  |  |  |  |  |
Services transferred at a point in time | $ | 9.3 |  | $ | — |  | $ | — |  | $ | 9.3 |
Services transferred over time |  | 222.3 |  |  | 171.5 |  |  | (4.5 | ) |  | 389.3 |
Revenue from contracts with customers | $ | 231.6 |  | $ | 171.5 |  | $ | (4.5 | ) | $ | 398.6 |
Nine Months Ended September 30, 2025 | Electric Utilities |  | Gas Utilities |  | Inter-segment Eliminations |  | Total |
Customer types: | (in millions) |
Retail | $ | 570.6 |  | $ | 797.0 |  | $ | — |  | $ | 1,367.6 |
Transportation |  | — |  |  | 143.4 |  |  | (0.3 | ) |  | 143.1 |
Wholesale |  | 16.9 |  |  | — |  |  | — |  |  | 16.9 |
Market - off-system sales |  | 38.3 |  |  | 0.1 |  |  | — |  |  | 38.4 |
Transmission |  | 33.3 |  |  | 0.3 |  |  | — |  |  | 33.6 |
Other revenues |  | 43.9 |  |  | 31.5 |  |  | (11.4 | ) |  | 64.0 |
Revenue from contracts with customers | $ | 703.0 |  | $ | 972.3 |  | $ | (11.7 | ) | $ | 1,663.6 |
Alternative revenue and other |  | 3.3 |  |  | 7.6 |  |  | — |  |  | 10.9 |
Total revenues | $ | 706.3 |  | $ | 979.9 |  | $ | (11.7 | ) | $ | 1,674.5 |
Timing of revenue recognition: |  |  |  |  |  |  |  |
Services transferred at a point in time | $ | 25.9 |  | $ | — |  | $ | — |  | $ | 25.9 |
Services transferred over time |  | 677.1 |  |  | 972.3 |  |  | (11.7 | ) |  | 1,637.7 |
Revenue from contracts with customers | $ | 703.0 |  | $ | 972.3 |  | $ | (11.7 | ) | $ | 1,663.6 |
Nine Months Ended September 30, 2024 | Electric Utilities |  | Gas Utilities |  | Inter-segment Eliminations |  | Total |
Customer types: | (in millions) |
Retail | $ | 529.4 |  | $ | 707.8 |  | $ | — |  | $ | 1,237.2 |
Transportation |  | — |  |  | 130.9 |  |  | — |  |  | 130.9 |
Wholesale |  | 21.1 |  |  | — |  |  | — |  |  | 21.1 |
Market - off-system sales |  | 22.8 |  |  | — |  |  | — |  |  | 22.8 |
Transmission |  | 39.1 |  |  | 0.4 |  |  | — |  |  | 39.5 |
Other revenues |  | 43.3 |  |  | 31.6 |  |  | (13.4 | ) |  | 61.5 |
Revenue from contracts with customers | $ | 655.7 |  | $ | 870.7 |  | $ | (13.4 | ) | $ | 1,513.0 |
Alternative revenue and other |  | 4.1 |  |  | 13.5 |  |  | — |  |  | 17.6 |
Total revenues | $ | 659.8 |  | $ | 884.2 |  | $ | (13.4 | ) | $ | 1,530.6 |
Timing of revenue recognition: |  |  |  |  |  |  |  |
Services transferred at a point in time | $ | 25.9 |  | $ | — |  | $ | — |  | $ | 25.9 |
Services transferred over time |  | 629.8 |  |  | 870.7 |  |  | (13.4 | ) |  | 1,487.1 |
Revenue from contracts with customers | $ | 655.7 |  | $ | 870.7 |  | $ | (13.4 | ) | $ | 1,513.0 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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