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VARIABLE INTEREST ENTITIES - WEPCO ENVIRONMENTAL TRUST (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2020 | Sep. 30, 2023 | Dec. 31, 2022
Assets |  |  |
Other current assets (restricted cash) |  | $ 43.6 | $ 25.6
Regulatory assets |  | 3,197.1 | 3,264.6
Other long-term assets (restricted cash) |  | 51.9 | 127.7
WEPCo Environmental Trust |  |  |
Variable interest entities |  |  |
Securitization of environmental control costs related to Pleasant Prairie power plant | $ 100.0 |  |
Assets |  |  |
Other current assets (restricted cash) |  | 3.9 | 3.0
Regulatory assets |  | 87.5 | 92.4
Other long-term assets (restricted cash) |  | 0.6 | 0.6
Liabilities |  |  |
Current portion of long-term debt |  | 9.0 | 8.9
Other current liabilities (accrued interest) |  | 0.5 | 0.1
Long-term debt |  | $ 89.8 | $ 94.1

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