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ACQUISITIONS AND DISPOSITIONS - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) facility | Feb. 29, 2024 USD ($) | Jun. 30, 2025 USD ($) facility | Jun. 30, 2025 USD ($) facility | Jun. 30, 2024 USD ($) | May 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from noncontrolling interests, net |  |  |  | $ 2,782.9 | $ 0.0 |
NMRD | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from divestiture of businesses |  | $ 107.0 |  |  |  |
Ohio Transmission And Indiana Michigan Transmission |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Subsidiary, ownership percentage, parent | 19.90% |  | 19.90% | 19.90% |  |
Proceeds from noncontrolling interests, gross | $ 2,820.0 |  |  |  |  |
Proceeds from noncontrolling interests, net | 2,780.0 |  |  |  |  |
Capital plan, amount | $ 54,000.0 |  | $ 54,000.0 | $ 54,000.0 |  |
VIU | Pixley | PSO |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of shares acquired |  |  |  |  |  | 100.00%
VIU | Flat Ridge IV | PSO |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of shares acquired | 100.00% |  | 100.00% | 100.00% |  |
VIU | Green Country | PSO |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of shares acquired | 100.00% |  | 100.00% | 100.00% |  |
Asset acquisition, property, plant and equipment | $ 819.0 |  | $ 819.0 | $ 819.0 |  |
Asset acquisition, intangible liability | 41.0 |  | 41.0 | 41.0 |  |
Asset acquisition, regulatory liability | $ 50.0 |  | $ 50.0 | $ 50.0 |  |
Three Electric Generation Facilities | VIU | PSO |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of properties | facility | 3 |  | 3 | 3 |  |
Payments to acquire plant |  |  | $ 1,400.0 |  |  |

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