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VARIABLE INTEREST ENTITIES - WEPCO ENVIRONMENTAL TRUST (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Nov. 01, 2020
--- | --- | --- | ---
Assets |  |  |
Other current assets (restricted cash) | $ 32.4 | $ 5.3 |
Regulatory assets | 3,217.4 | 3,339.7 |
Other long-term assets (restricted cash) | 34.2 | 27.1 |
Liabilities |  |  |
Current portion of long-term debt | 1,901.4 | 1,729.0 |
Long-term debt | 17,663.3 | 17,178.1 |
WEPCo Environmental Trust Finance I, LLC |  |  |
Variable interest entities |  |  |
Securitization of environmental control costs related to Pleasant Prairie power plant |  |  | $ 100.0
Assets |  |  |
Other current assets (restricted cash) | 4.5 | 1.5 |
Regulatory assets | 69.6 | 76.5 |
Other long-term assets (restricted cash) | 0.6 | 0.6 |
Liabilities |  |  |
Current portion of long-term debt | 9.2 | 9.2 |
Other current liabilities (accrued interest) | 0.4 | 0.1 |
Long-term debt | $ 72.0 | $ 76.4 |

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