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Regulatory Environment - PGL QIP Rider (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) Assurance | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 31, 2024 USD ($)
Public Utilities, General Disclosures |  |  |  |  |
Pre-tax charge to income |  | $ (1,746.3) | $ (1,536.3) | $ (1,732.6) |
Reduction in revenues |  | (8,599.9) | (8,893.0) | (9,597.4) |
Other operation and maintenance |  | 2,158.0 | 2,100.5 | 1,938.0 |
Interest expense |  | 815.3 | $ 727.4 | $ 515.1 |
PGL |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |
Other operation and maintenance | $ 12.1 |  |  |  |
Illinois Commerce Commission (ICC) | PGL | 2016 Annual QIP Rider Reconciliation |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |
Disallowed capital costs |  |  |  |  | $ 14.8
Pre-tax charge to income | 25.3 |  |  |  |
Reduction in revenues | 12.9 |  |  |  |
Other operation and maintenance | 12.1 |  |  |  |
Interest expense | $ 0.3 |  |  |  |
Illinois Commerce Commission (ICC) | PGL | Open Rider QIP Reconciliations |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |
Aggregate capital costs during open reconciliation years |  | $ 2,800.0 |  |  |
Amount of assurance that PGL's QIP rider costs will be recoverable | Assurance |  | 0 |  |  |

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