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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 1,994.4 $ 2,017.7    
Allowance for credit losses 213.8 199.3 $ 200.6 $ 198.3
Accounts receivable and unbilled revenues, net 1,780.6 1,818.4    
Total accounts receivable, net - past due greater than 90 days $ 131.2 $ 106.7    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 97.40% 96.80%    
Amount of net accounts receivable with regulatory protections $ 1,119.8      
Percent of net accounts receivable with regulatory protections 62.90%      
Utility Operations        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 1,936.7 $ 1,988.0    
Allowance for credit losses 213.8 199.3    
Accounts receivable and unbilled revenues, net 1,722.9 1,788.7    
Total accounts receivable, net - past due greater than 90 days $ 131.2 $ 106.7    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 97.40% 96.80%    
Wisconsin | Utility Operations        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 1,232.2 $ 1,199.4    
Allowance for credit losses 90.9 82.0 85.7 84.0
Accounts receivable and unbilled revenues, net 1,141.3 1,117.4    
Total accounts receivable, net - past due greater than 90 days $ 67.9 $ 51.9    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 97.50% 97.00%    
Illinois | Utility Operations        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 561.0 $ 624.2    
Allowance for credit losses 116.5 111.0 107.0 105.5
Accounts receivable and unbilled revenues, net 444.5 513.2    
Total accounts receivable, net - past due greater than 90 days $ 61.6 $ 52.9    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 100.00% 100.00%    
Other States | Utility Operations        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable and unbilled revenues $ 143.5 $ 164.4    
Allowance for credit losses 6.4 6.3 $ 7.9 $ 8.8
Accounts receivable and unbilled revenues, net 137.1 158.1    
Total accounts receivable, net - past due greater than 90 days $ 1.7 $ 1.9    
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 $ 50.0 $ 25.4    
Allowance for credit losses 0.0 0.0    
Accounts receivable and unbilled revenues, net 50.0 25.4    
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 $ 7.7 $ 4.3    
Allowance for credit losses 0.0 0.0    
Accounts receivable and unbilled revenues, net 7.7 4.3    
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%