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VARIABLE INTEREST ENTITIES - WEPCO ENVIRONMENTAL TRUST (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2020 | Mar. 31, 2022 | Dec. 31, 2021
Assets |  |  |
Other current assets (restricted cash) |  | $ 31.8 | $ 19.6
Regulatory assets |  | 3,163.6 | 3,264.8
Other long-term assets (restricted cash) |  | 54.0 | 51.6
Liabilities |  |  |
Accounts payable |  | 693.7 | 1,005.7
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) |  | 5.6 | 2.4
Regulatory assets |  | 98.2 | 100.7
Other long-term assets (restricted cash) |  | 0.6 | 0.6
Liabilities |  |  |
Current portion of long-term debt |  | 8.8 | 8.8
Accounts payable |  | 0.1 | 0.0
Other current liabilities (accrued interest) |  | 0.5 | 0.1
Long-term debt |  | $ 102.8 | $ 102.7

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