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REGULATORY ENVIRONMENT - COVID-19 (Details) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 order | Sep. 30, 2021 USD ($) | Apr. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory assets |  |  |  | $ 3,628.1 |  | $ 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 |  |  |  | $ 25.3 |  |
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 |  |  |  |  |

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