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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable and unbilled revenues $ 1,341.7  
Allowance for credit losses 164.8 $ 140.0
Accounts receivable and unbilled revenues, net 1,176.9  
Total accounts receivable, net - past due greater than 90 days $ 97.5  
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 93.40%  
Amount of net accounts receivable with regulatory protections $ 684.6  
Percent of net accounts receivable with regulatory protections 58.20%  
Wisconsin    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable and unbilled revenues $ 849.1  
Allowance for credit losses 67.7 59.9
Accounts receivable and unbilled revenues, net 781.4  
Total accounts receivable, net - past due greater than 90 days $ 57.7  
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 95.70%  
Illinois    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable and unbilled revenues $ 404.7  
Allowance for credit losses 93.1 75.9
Accounts receivable and unbilled revenues, net 311.6  
Total accounts receivable, net - past due greater than 90 days $ 35.9  
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 100.00%  
Other States    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable and unbilled revenues $ 79.2  
Allowance for credit losses 3.9 4.1
Accounts receivable and unbilled revenues, net 75.3  
Total accounts receivable, net - past due greater than 90 days $ 3.9  
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 0.00%  
Total Utility Operations    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable and unbilled revenues $ 1,333.0  
Allowance for credit losses 164.7 139.9
Accounts receivable and unbilled revenues, net 1,168.3  
Total accounts receivable, net - past due greater than 90 days $ 97.5  
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms 93.40%  
Non-Utility Energy Infrastructure    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable and unbilled revenues $ 5.8  
Allowance for credit losses 0.0  
Accounts receivable and unbilled revenues, net 5.8  
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 $ 2.9  
Allowance for credit losses 0.1 $ 0.1
Accounts receivable and unbilled revenues, net 2.8  
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]    
Increase in allowance for credit loss $ 2.7