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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2021
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Determination Methodology and Factors [Abstract]  
Schedule of balance sheet impact of WEPCo Environmental Trust
The following table summarizes the impact of WEPCo Environmental Trust on our balance sheet.
(in millions)December 31, 2021
Assets
Other current assets (restricted cash)$2.4 
Regulatory assets100.7 
Other long-term assets (restricted cash)0.6 
Liabilities
Current portion of long-term debt8.8 
Other current liabilities (accrued interest)0.1 
Long-term debt102.7