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Regulatory Environment - PGL and NSG 2023 Rate Order (Details) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 30, 2024 USD ($) | Nov. 16, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Feb. 20, 2025 in | Jun. 07, 2024 USD ($)
Public Utilities, General Disclosures |  |  |  |  |  |  |  |
Impairment related to ICC disallowances |  |  |  | $ 12.1 | $ 178.9 | $ 0.0 |  |
2023 Rate Order | Illinois Commerce Commission (ICC) |  |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |  |
Impairment related to ICC disallowances |  |  | $ 178.9 |  |  |  |  |
2023 Rate Order | Illinois Commerce Commission (ICC) | PGL |  |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |  |
Approved rate increase | $ 1.6 | $ 304.6 |  |  |  |  |  |
Approved rate increase (as a percent) |  | 43.50% |  |  |  |  |  |
Approved return on equity (as a percent) |  | 9.38% |  |  |  |  |  |
Approved common equity component average (as a percent) |  | 50.79% |  |  |  |  |  |
Disallowed capital costs |  | $ 236.2 |  |  |  |  |  |
Additional capital spending approved | $ 28.5 |  |  |  |  |  |  |
Impairment related to ICC disallowances |  |  | 177.2 |  |  |  |  |
2023 Rate Order | Illinois Commerce Commission (ICC) | NSG |  |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |  |
Approved rate increase |  | $ 11.0 |  |  |  |  |  |
Approved rate increase (as a percent) |  | 11.60% |  |  |  |  |  |
Approved return on equity (as a percent) |  | 9.38% |  |  |  |  |  |
Approved common equity component average (as a percent) |  | 52.58% |  |  |  |  |  |
Disallowed capital costs |  | $ 1.7 |  |  |  |  |  |
Impairment related to ICC disallowances |  |  | $ 1.7 |  |  |  |  |
2023 Rate Order | Illinois Appellate Court |  |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |  |
Disallowed capital costs |  |  |  |  |  |  |  | $ 237.9
2023 Rate Order | Illinois Appellate Court | PGL |  |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |  |
Disallowance of future SMP capital investments |  |  |  |  |  |  |  | $ 116.0
SMP Proceedings | Illinois Commerce Commission (ICC) | PGL | Subsequent event |  |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |  |
Minimum diameter of pipe that does not require replacement | in |  |  |  |  |  |  | 36 |

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