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Variable Interest Entities - WEPCo Environmental Trust (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Nov. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Variable interest entities |  |  |  |
Other current assets (restricted cash) |  | $ 19.6 | $ 0.0 | $ 0.0
Regulatory assets |  | 3,264.8 | 3,524.1 |
Other long-term assets (restricted cash) |  | 51.6 | 47.8 | $ 44.8
Current portion of long-term debt |  | 91.0 | 777.7 |
Long-term debt |  | 13,472.4 | $ 11,672.8 |
WEPCo Environmental Trust |  |  |  |
Variable interest entities |  |  |  |
Securitized Regulatory Asset | $ 100.0 |  |  |
Other current assets (restricted cash) |  | 2.4 |  |
Regulatory assets |  | 100.7 |  |
Other long-term assets (restricted cash) |  | 0.6 |  |
Current portion of long-term debt |  | 8.8 |  |
Other current liabilities (accrued interest) |  | 0.1 |  |
Long-term debt |  | $ 102.7 |  |

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