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REGULATORY ENVIRONMENT - PGL QIP RIDER (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2026 | Jun. 30, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Aug. 31, 2024
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Pre-tax charge to income |  | $ (328.0) |  | $ (262.5) | $ (1,187.2) | $ (1,048.7) |
Reduction in revenues |  | (2,062.1) |  | $ (2,009.5) | (5,496.3) | $ (5,159.0) |
PGL |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Impairments related to Illinois segment |  |  | $ 130.0 |  |  |  |
Illinois Commerce Commission (ICC) | PGL | 2016 Annual QIP Rider Reconciliation |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Disallowed capital costs |  |  |  |  |  |  | $ 14.8
Illinois Commerce Commission (ICC) | PGL | QIP Settlement |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Qualified infrastructure investment costs to be removed from rate base | $ 130.0 |  |  |  |  |  |
Refunds required to customers | $ 75.0 |  |  |  |  |  |
Refund period | 3 years |  |  |  |  |  |
Pre-tax charge to income |  |  | 155.0 |  |  |  |
Impairments related to Illinois segment |  |  | 130.0 |  |  |  |
Reduction in revenues |  |  | $ 25.0 |  |  |  |
Total balance sheet impact recorded |  | 205.0 |  |  | 205.0 |  |
Charge to income recorded in prior years |  | $ 50.0 |  |  | $ 50.0 |  |
Illinois Commerce Commission (ICC) | PGL | QIP Settlement | 2026 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amount to be refunded to customers each year | $ 25.0 |  |  |  |  |  |
Illinois Commerce Commission (ICC) | PGL | QIP Settlement | 2027 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amount to be refunded to customers each year | 25.0 |  |  |  |  |  |
Illinois Commerce Commission (ICC) | PGL | QIP Settlement | 2028 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amount to be refunded to customers each year | $ 25.0 |  |  |  |  |  |

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