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VARIABLE INTEREST ENTITIES - WEPCO ENVIRONMENTAL TRUST (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025 | Nov. 01, 2020
--- | --- | --- | ---
Assets |  |  |
Other current assets (restricted cash) | $ 17.7 | $ 9.1 |
Regulatory assets | 3,130.4 | 3,156.3 |
Other long-term assets (restricted cash) | 28.2 | 34.2 |
Liabilities |  |  |
Current portion of long-term debt | 1,413.5 | 1,519.4 |
Accounts payable | 1,018.6 | 1,140.1 |
Long-term debt | 19,216.3 | 18,498.1 |
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) | 1.5 | 2.0 |
Regulatory assets | 63.6 | 67.5 |
Other long-term assets (restricted cash) | 0.6 | 0.6 |
Liabilities |  |  |
Current portion of long-term debt | 9.4 | 9.3 |
Accounts payable | 0.0 | 0.1 |
Other current liabilities (accrued interest) | 0.1 | 0.1 |
Long-term debt | $ 62.8 | $ 67.4 |

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