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REGULATORY ENVIRONMENT - PGL AND NSG 2023 RATE ORDER (Details) - Illinois Commerce Commission (ICC) $ in Millions |  | 1 Months Ended |
--- | --- | --- | ---
May 30, 2024 USD ($) | Nov. 30, 2023 USD ($) | Feb. 28, 2025 in
PGL | 2023 Rate Order |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
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 |
PGL | May 2024 Rehearing Order |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved rate increase | $ 1.6 |  |
Additional capital spend approved | $ 28.5 |  |
PGL | SMP Proceedings |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Minimum diameter of pipe that does not require replacement | in |  |  | 36
NSG | 2023 Rate Order |  |  |
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 |

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- Definition Amount of disallowed costs for rate making purposes for recently completed plants in regulated industries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 10.E) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section 35 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478654/980-360-35-12 + Details
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