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Regulatory Environment - PGL and NSG 2023 Rate Order (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 16, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures |  |  |  |
Impairment related to ICC disallowances |  | $ 178.9 | $ 0.0 | $ 0.0
Illinois Commerce Commission (ICC) | 2023 Rate Order |  |  |  |
Public Utilities, General Disclosures |  |  |  |
Impairment related to ICC disallowances |  | 178.9 |  |
Illinois Commerce Commission (ICC) | 2023 Rate Order | PGL |  |  |  |
Public Utilities, General Disclosures |  |  |  |
Approved rate increase | $ 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 |  |  |
Impairment related to ICC disallowances |  | 177.2 |  |
Illinois Commerce Commission (ICC) | 2023 Rate Order | 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 |  |

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