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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 1,971.8 $ 1,832.1    
Allowance for credit losses 159.4 162.8 $ 190.7 $ 193.5
Accounts receivable and unbilled revenues, net 1,812.4 1,669.3    
Total accounts receivable, net - past due greater than 90 days $ 78.9 $ 84.4    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 96.70% 93.20%    
Amount of net accounts receivable with regulatory protections $ 1,134.0      
Percent of net accounts receivable with regulatory protections 62.60%      
Public Utilities        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 1,900.9 $ 1,786.1    
Allowance for credit losses 159.4 162.8    
Accounts receivable and unbilled revenues, net 1,741.5 1,623.3    
Total accounts receivable, net - past due greater than 90 days $ 78.9 $ 84.4    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 96.70% 93.20%    
Wisconsin | Public Utilities        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 1,183.3 $ 1,149.9    
Allowance for credit losses 60.9 73.6 83.0 77.4
Accounts receivable and unbilled revenues, net 1,122.4 1,076.3    
Total accounts receivable, net - past due greater than 90 days $ 43.3 $ 51.8    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 96.00% 93.80%    
Illinois | Public Utilities        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 605.9 $ 535.6    
Allowance for credit losses 93.2 83.9 104.6 109.7
Accounts receivable and unbilled revenues, net 512.7 451.7    
Total accounts receivable, net - past due greater than 90 days $ 34.7 $ 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 $ 111.7 $ 100.6    
Allowance for credit losses 5.3 5.3 $ 3.1 $ 6.4
Accounts receivable and unbilled revenues, net 106.4 95.3    
Total accounts receivable, net - past due greater than 90 days $ 0.9 $ 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 $ 64.5 $ 40.0    
Allowance for credit losses 0.0 0.0    
Accounts receivable and unbilled revenues, net 64.5 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 $ 6.4 $ 6.0    
Allowance for credit losses 0.0 0.0    
Accounts receivable and unbilled revenues, net 6.4 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%