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Regulatory Matters - Summary of Utilities Rate Plans (O&R New York-Gas) (Details) - USD ($) $ in Millions | 12 Months Ended | 36 Months Ended |
--- | --- | --- | ---
Dec. 31, 2028 | Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2024 | Dec. 31, 2027 | Dec. 31, 2024 | Dec. 31, 2021 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Deferred regulatory assets |  |  |  | $ 848.0 |  | $ 848.0 |  | $ 722.0
O&R | Gas |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Deferred regulatory assets |  |  |  | 2.0 |  | $ 2.0 |  | $ 7.6
Deferrals for property taxes limitation from rates (percent) |  |  |  |  |  | 90.00% |  |
Recovery of late payment charges, amount |  |  |  | $ 0.6 |  |  |  |
Regulatory assets usefull life |  |  |  | 15 years |  |  |  |
Uncollecetible expenses, threshold amount |  |  |  | $ 0.5 |  |  |  |
Surcharge recovery threshold percentage |  |  |  | 50.00% |  |  |  |
O&R | Gas | Scenario, Forecast |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Authorized return on common equity (percent) |  | 10.10% | 10.10% |  |  |  |  |
Common equity ratio (percent) | 48.00% | 48.00% | 48.00% |  | 48.00% |  |  |
Requested rate increase (decrease), amount | $ 166.0 | $ 266.0 | $ 441.0 |  |  |  |  |
O&R | Gas | Rate Plan for Year 1 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | $ 0.7 |  |
Amortization to income of net regulatory assets |  |  |  |  |  | 0.8 |  |
Potential positive rate adjustment for gas safety and performance |  |  |  |  |  | 1.2 |  |
Potential earnings adjustment mechanism incentives |  |  |  |  |  | $ 0.2 |  |
Authorized return on common equity (percent) |  |  |  | 9.20% |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  | $ 4.4 |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  | 0.10% |  |
O&R | Gas | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  | $ 3.6 |  |  |
Amortization to income of net regulatory assets |  |  |  |  | $ 8.4 |  |  |
Authorized return on common equity (percent) |  |  |  |  | 9.75% |  |  |
O&R | Gas | Rate Plan for Year 2 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | $ 7.4 |  |
Amortization to income of net regulatory assets |  |  |  |  |  | 0.7 |  |
Potential positive rate adjustment for gas safety and performance |  |  |  |  |  | 1.3 |  |
Potential earnings adjustment mechanism incentives |  |  |  |  |  | $ 0.2 |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  | 4.4 |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  | 0.075% |  |
O&R | Gas | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  | $ 18.0 |  |  |
Amortization to income of net regulatory assets |  |  |  |  | 8.2 |  |  |
O&R | Gas | Rate Plan for Year 3 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | $ 9.9 |  |
Amortization to income of net regulatory assets |  |  |  |  |  | 0.3 |  |
Potential positive rate adjustment for gas safety and performance |  |  |  |  |  | 1.4 |  |
Potential earnings adjustment mechanism incentives |  |  |  |  |  | $ 0.4 |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  | $ 4.4 |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  | 0.05% |  |
O&R | Gas | Rate Plan for Year 3 | Scenario, Forecast |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  | 16.5 |  |  |
Amortization to income of net regulatory assets |  |  |  |  | $ 8.0 |  |  |
Energy Efficiency | O&R | Gas |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Actual earnings adjustment mechanism incentives |  |  |  |  |  | $ 0.2 |  |

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