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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable and unbilled revenues $ 1,085.1    
Allowance for credit losses 173.3 $ 164.7 $ 140.0
Accounts receivable and unbilled revenues, net 911.8    
Total accounts receivable, net - past due greater than 90 days $ 132.2    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 93.00%    
Amount of net accounts receivable with regulatory protections $ 498.3    
Percent of net accounts receivable with regulatory protections 54.70%    
Utility Operations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable and unbilled revenues $ 1,074.4    
Allowance for credit losses 173.1 164.6 139.9
Accounts receivable and unbilled revenues, net 901.3    
Total accounts receivable, net - past due greater than 90 days $ 132.2    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 93.00%    
Wisconsin | Utility Operations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable and unbilled revenues $ 766.8    
Allowance for credit losses 88.5 77.9 59.9
Accounts receivable and unbilled revenues, net 678.3    
Total accounts receivable, net - past due greater than 90 days $ 71.5    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 97.00%    
Illinois | Utility Operations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable and unbilled revenues $ 272.8    
Allowance for credit losses 80.2 82.7 75.9
Accounts receivable and unbilled revenues, net 192.6    
Total accounts receivable, net - past due greater than 90 days $ 53.6    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 100.00%    
Other States | Utility Operations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable and unbilled revenues $ 34.8    
Allowance for credit losses 4.4 4.0 4.1
Accounts receivable and unbilled revenues, net 30.4    
Total accounts receivable, net - past due greater than 90 days $ 7.1    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 0.00%    
Non-Utility Energy Infrastructure      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable and unbilled revenues $ 6.5    
Allowance for credit losses 0.0    
Accounts receivable and unbilled revenues, net 6.5    
Total accounts receivable, net - past due greater than 90 days $ 0.0    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 0.00%    
Corporate and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable and unbilled revenues $ 4.2    
Allowance for credit losses 0.2 $ 0.1 $ 0.1
Accounts receivable and unbilled revenues, net 4.0    
Total accounts receivable, net - past due greater than 90 days $ 0.0    
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 0.00%    
COVID-19      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for credit losses $ 2.9