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VARIABLE INTEREST ENTITIES (Tables)
9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of balance sheet impact of WEPCo Environmental Trust Finance I, LLC
The following table summarizes the impact of WEPCo Environmental Trust on our balance sheets:
(in millions)September 30, 2025December 31, 2024
Assets
Other current assets (restricted cash)$4.5 $1.5 
Regulatory assets69.6 76.5 
Other long-term assets (restricted cash)0.6 0.6 
Liabilities
Current portion of long-term debt9.2 9.2 
Other current liabilities (accrued interest)0.4 0.1 
Long-term debt72.0 76.4