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REGULATORY ENVIRONMENT - PGL AND NSG UEA RIDER (Details) - Illinois Commerce Commission (ICC) - Uncollectible Expense Adjustment Rider Reconciliation $ in Millions | 1 Months Ended |
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May 31, 2023 USD ($) | Mar. 31, 2024 USD ($) Assurance
Public Utilities, General Disclosures [Line Items] |  |
Amount of assurance that PGL's QIP rider costs will be recoverable | Assurance |  | 0
Minimum annual costs included in UEA rider during open reconciliation years |  | $ 10.0
Maximum annual costs included in UEA rider during open reconciliation years |  | $ 40.0
PGL |  |
Public Utilities, General Disclosures [Line Items] |  |
Refunds required to customers | $ 15.4 |
Refund period | 9 months |
NSG |  |
Public Utilities, General Disclosures [Line Items] |  |
Refunds required to customers | $ 0.7 |
Refund period | 9 months |

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