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REGULATORY ENVIRONMENT - PGL AND NSG 2023 RATE ORDER (Details) - Illinois Commerce Commission (ICC) - 2023 Rate Order - USD ($) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
May 30, 2024 | Nov. 16, 2023 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |
Impairment of property, plant, and equipment |  |  | $ 178.9
PGL |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
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 spend approved | $ 28.5 |  |
Impairment of property, plant, and equipment |  |  | 177.2
NSG |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
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 of property, plant, and equipment |  |  | $ 1.7

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