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REGULATORY ENVIRONMENT - COVID-19 (Details)
$ in Millions
1 Months Ended
Mar. 31, 2021
USD ($)
Aug. 31, 2020
Jun. 30, 2020
USD ($)
Mar. 31, 2020
order
Jun. 30, 2021
USD ($)
Apr. 30, 2021
USD ($)
Mar. 01, 2021
Dec. 31, 2020
USD ($)
Public Utilities, General Disclosures [Line Items]                
Regulatory assets         $ 3,623.5     $ 3,544.1
Public Service Commission of Wisconsin (PSCW)                
Public Utilities, General Disclosures [Line Items]                
Number of orders issued in response to COVID-19 | order       2        
Illinois Commerce Commission (ICC)                
Public Utilities, General Disclosures [Line Items]                
Additional period of time deposit requirements will be waived     4 months          
Percentage below federal poverty level for which customer disconnection is disallowed             300.00%  
Illinois Commerce Commission (ICC) | COVID-19                
Public Utilities, General Disclosures [Line Items]                
Recovery period of regulatory asset     36 months          
Regulatory assets         $ 26.9      
Illinois Commerce Commission (ICC) | PGL                
Public Utilities, General Disclosures [Line Items]                
Amount available through bill payment assistance program     $ 12.0          
Additional amount available through bill payment assistance program $ 6.0              
Amount of funds provided through bill payment assistance program           $ 18.0    
Illinois Commerce Commission (ICC) | NSG                
Public Utilities, General Disclosures [Line Items]                
Amount available through bill payment assistance program     $ 1.2          
Minnesota Public Utilities Commission (MPUC)                
Public Utilities, General Disclosures [Line Items]                
Period of time after peacetime emergency that order will be effective 90 days 60 days