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ACQUISITIONS AND DISPOSITIONS - Impact of Asset Acquisitions (Details) MW in Millions, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 USD ($) MW | Dec. 31, 2024 USD ($)
Asset Acquisition, Contingent Consideration [Line Items] |  |
Property, Plant and Equipment, Net | $ 88,017.7 | $ 82,415.6
Operating Lease Assets | 578.2 | 580.1
Asset Retirement Obligations | 3,647.1 | 3,530.6
Regulatory Liabilities and Deferred Investment Tax Credits | 8,320.0 | 8,344.0
Other Current Liabilities | 1,551.4 | 1,490.9
Deferred credits and other noncurrent liabilities | 844.6 | 800.6
PSO |  |
Asset Acquisition, Contingent Consideration [Line Items] |  |
Property, Plant and Equipment, Net | 8,635.9 | 6,532.3
Operating Lease Assets | 126.1 | 106.2
Asset Retirement Obligations | 139.1 | 118.8
Regulatory Liabilities and Deferred Investment Tax Credits | 722.0 | 689.7
Other Current Liabilities | 88.0 | 78.6
Deferred credits and other noncurrent liabilities | $ 35.4 | $ 34.3
PSO | VIU |  |
Asset Acquisition, Contingent Consideration [Line Items] |  |
Generation Capacity (MWs) | MW | 1,272 |
Property, Plant and Equipment, Net | $ 1,822.9 |
Operating Lease Assets | 25.1 |
Asset Retirement Obligations | 19.3 |
Other Liabilities | $ 91.4 |
Green Country | PSO |  |
Asset Acquisition, Contingent Consideration [Line Items] |  |
Generation Capacity (MWs) | MW | 795 |
Property, Plant and Equipment, Net | $ 818.9 |
Operating Lease Assets | 0.0 |
Asset Retirement Obligations | 0.0 |
Other Liabilities | 91.4 |
Green Country | PSO | VIU |  |
Asset Acquisition, Contingent Consideration [Line Items] |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 50.0 |
Other Current Liabilities | 21.0 |
Deferred credits and other noncurrent liabilities | $ 20.0 |
Pixley | PSO |  |
Asset Acquisition, Contingent Consideration [Line Items] |  |
Generation Capacity (MWs) | MW | 189 |
Property, Plant and Equipment, Net | $ 379.6 |
Operating Lease Assets | 8.9 |
Asset Retirement Obligations | 12.4 |
Other Liabilities | $ 0.0 |
Flat Ridge IV | PSO |  |
Asset Acquisition, Contingent Consideration [Line Items] |  |
Generation Capacity (MWs) | MW | 135 |
Property, Plant and Equipment, Net | $ 305.3 |
Operating Lease Assets | 7.4 |
Asset Retirement Obligations | 3.1 |
Other Liabilities | $ 0.0 |
Flat Ridge V | PSO |  |
Asset Acquisition, Contingent Consideration [Line Items] |  |
Generation Capacity (MWs) | MW | 153 |
Property, Plant and Equipment, Net | $ 319.1 |
Operating Lease Assets | 8.8 |
Asset Retirement Obligations | 3.8 |
Other Liabilities | $ 0.0 |

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