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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable and unbilled revenues $ 1,399.0   $ 1,832.1      
Allowance for credit losses 129.5 $ 142.2 162.8 $ 155.0 $ 166.9 $ 193.5
Accounts receivable and unbilled revenues, net 1,269.5   1,669.3      
Total accounts receivable, net - past due greater than 90 days $ 112.5   $ 84.4      
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 91.70%   93.20%      
Amount of net accounts receivable with regulatory protections $ 838.9          
Percent of net accounts receivable with regulatory protections 66.10%          
Public Utilities            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable and unbilled revenues $ 1,350.7   $ 1,786.1      
Allowance for credit losses 129.5   162.8      
Accounts receivable and unbilled revenues, net 1,221.2   1,623.3      
Total accounts receivable, net - past due greater than 90 days $ 112.5   $ 84.4      
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 91.70%   93.20%      
Wisconsin | Public Utilities            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable and unbilled revenues $ 893.9   $ 1,149.9      
Allowance for credit losses 48.7 52.3 73.6 63.9 68.7 77.4
Accounts receivable and unbilled revenues, net 845.2   1,076.3      
Total accounts receivable, net - past due greater than 90 days $ 49.6   $ 51.8      
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 93.90%   93.80%      
Illinois | Public Utilities            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable and unbilled revenues $ 402.4   $ 535.6      
Allowance for credit losses 76.6 84.6 83.9 86.9 93.2 109.7
Accounts receivable and unbilled revenues, net 325.8   451.7      
Total accounts receivable, net - past due greater than 90 days $ 56.6   $ 30.1      
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 100.00%   100.00%      
Other States | Public Utilities            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable and unbilled revenues $ 54.4   $ 100.6      
Allowance for credit losses 4.2 $ 5.3 5.3 $ 4.2 $ 5.0 $ 6.4
Accounts receivable and unbilled revenues, net 50.2   95.3      
Total accounts receivable, net - past due greater than 90 days $ 6.3   $ 2.5      
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 0.00%   0.00%      
Non-Utility Energy Infrastructure            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable and unbilled revenues $ 40.8   $ 40.0      
Allowance for credit losses 0.0   0.0      
Accounts receivable and unbilled revenues, net 40.8   40.0      
Total accounts receivable, net - past due greater than 90 days $ 0.0   $ 0.0      
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 0.00%   0.00%      
Corporate and Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable and unbilled revenues $ 7.5   $ 6.0      
Allowance for credit losses 0.0   0.0      
Accounts receivable and unbilled revenues, net 7.5   6.0      
Total accounts receivable, net - past due greater than 90 days $ 0.0   $ 0.0      
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 0.00%   0.00%