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VARIABLE INTEREST ENTITIES - WEPCO ENVIRONMENTAL TRUST (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Assets |  |  |
Other current assets (restricted cash) |  | $ 36.4 | $ 0.0
Regulatory assets |  | 3,488.7 | 3,524.1
Other long-term assets (restricted cash) |  | 46.8 | $ 47.8
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) |  | 4.6 |
Regulatory assets |  | 102.9 |
Other long-term assets (restricted cash) |  | 0.6 |
Liabilities |  |  |
Current portion of long-term debt |  | 8.5 |
Other current liabilities (accrued interest) |  | 0.7 |
Long-term debt |  | $ 107.0 |

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