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VARIABLE INTEREST ENTITIES - WEPCO ENVIRONMENTAL TRUST (Details) - USD ($)
$ in Millions
 1 Months Ended
Nov. 30, 2020
Jun. 30, 2023
Dec. 31, 2022
Assets      
Other current assets (restricted cash)   $ 32.7 $ 25.6
Regulatory assets   3,238.9 3,264.6
Other long-term assets (restricted cash)   52.7 127.7
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)   1.5 3.0
Regulatory assets   89.5 92.4
Other long-term assets (restricted cash)   0.6 0.6
Liabilities      
Current portion of long-term debt   9.0 8.9
Other current liabilities (accrued interest)   0.1 0.1
Long-term debt   $ 89.7 $ 94.1