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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [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, 2023December 31, 2022
Assets
Other current assets (restricted cash)$0.8 $3.0 
Regulatory assets85.9 92.4 
Other long-term assets (restricted cash)0.6 0.6 
Liabilities
Current portion of long-term debt9.0 8.9 
Other current liabilities (accrued interest)0.1 0.1 
Long-term debt85.3 94.1