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v3.25.0.1

Variable Interest Entities - WEPCo Environmental Trust (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Nov. 30, 2020 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Assets |  |  |  |
Other current assets (restricted cash) |  | $ 5.3 | $ 70.1 | $ 25.6
Regulatory assets |  | 3,339.7 | 3,249.8 |
Other long-term assets (restricted cash) |  | 27.1 | 52.2 | $ 127.7
Liabilities |  |  |  |
Current portion of long-term debt |  | 1,729.0 | 1,264.2 |
Long-term debt |  | 17,178.1 | 15,366.9 |
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 | 0.8 |
Regulatory assets |  | 76.5 | 85.9 |
Other long-term assets (restricted cash) |  | 0.6 | 0.6 |
Liabilities |  |  |  |
Current portion of long-term debt |  | 9.2 | 9.0 |
Other current liabilities (accrued interest) |  | 0.1 | 0.1 |
Long-term debt |  | $ 76.4 | $ 85.3 |

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