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Regulatory Matters - Summary of Utilities Rate Plans (O&R New York-Electric) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Jan. 31, 2024 | Dec. 31, 2028 | Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2027 | Dec. 31, 2024 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred regulatory assets |  |  |  |  | $ 848.0 | $ 722.0 |  |  | $ 848.0 |
Deferred regulatory liabilities |  |  |  |  | $ 0.0 | 0.0 | $ 3.0 |  | $ 0.0 | $ 7.0
O&R | Electric |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred regulatory assets |  |  |  |  |  | 3.4 | 6.9 |  |  |
Deferral of net increase (decrease) to regulatory assets |  |  |  |  |  | 15.4 | 9.4 |  |  |
Authorized return on common equity (percent) | 10.10% |  |  |  |  |  |  |  |  |
Earnings sharing (percent) |  |  |  |  | 9.70% |  |  |  | 9.70% |
Common equity ratio (percent) | 48.00% |  |  |  |  |  |  |  | 48.00% |
Recovery of late payment charges, period (in years) |  |  |  |  | 3 years |  |  |  |  |
Recovery of late payment charges, amount |  |  |  |  | $ 2.2 |  |  |  |  |
Recovery of late payment charges, return on equity threshold rate |  |  |  |  | 500.00% |  |  |  |  |
Regulatory assets usefull life |  |  |  |  | 15 years |  |  |  |  |
Uncollecetible expenses, threshold amount |  |  |  |  | $ 0.9 |  |  |  |  |
Surcharge recovery threshold percentage |  |  |  |  | 50.00% |  |  |  |  |
O&R | Electric | Rate Plan for Year 1 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  | $ 4.9 |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  |  | 11.8 |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  |  | 3.3 |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  | $ 1,021.0 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  | 6.77% |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  | 9.20% |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  | 8.96% |
Cost of long-term debt (percent) |  |  |  |  |  |  |  |  | 4.58% |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 11.7 |
Regulatory assets, amortization period (in years) |  |  |  |  | 5 years |  |  |  | 5 years |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  |  | 1000.00% |
O&R | Electric | Rate Plan for Year 1 | Electric average excluding AMI |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  |  | $ 1,175.0 |
O&R | Electric | Rate Plan for Year 1 | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  | 4.3 |
O&R | Electric | Rate Plan for Year 2 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  | 16.2 |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  |  | 13.5 |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  |  | 2.3 |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  | $ 1,044.0 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  | 6.73% |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  | 8.73% |
Cost of long-term debt (percent) |  |  |  |  |  |  |  |  | 4.51% |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 11.7 |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  |  | 750.00% |
O&R | Electric | Rate Plan for Year 2 | Electric average excluding AMI |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  |  | $ 1,198.0 |
O&R | Electric | Rate Plan for Year 2 | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  | 4.4 |
O&R | Electric | Rate Plan for Year 3 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  | 23.1 |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  |  | 15.2 |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  |  | 4.0 |
Potential incentive if target is met, related to service terminations |  |  |  |  |  | 1.5 | $ 2.7 |  |  |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  | $ 1,144.0 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  | 6.72% |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  | 9.86% |
Cost of long-term debt (percent) |  |  |  |  |  |  |  |  | 4.49% |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 11.7 |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  |  | 500.00% |
O&R | Electric | Rate Plan for Year 3 | Electric average excluding AMI |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  |  | $ 1,304.0 |
O&R | Electric | Rate Plan for Year 3 | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  | 5.1 |
O&R | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Earnings sharing (percent) |  |  | 10.25% |  |  |  |  | 10.25% |  |
Common equity ratio (percent) |  |  |  |  |  |  |  | 48.00% |  |
Requested rate increase (decrease), amount |  | $ 880.0 | $ 932.0 |  |  |  |  |  |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 1 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  | $ (13.1) |  |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  | 4.5 |  |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  | 3.9 |  |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  | $ 1,293.0 |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  | 7.25% |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  | 9.75% |  |
Cost of long-term debt (percent) |  |  |  |  |  |  |  | 4.95% |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 1 | Electric average excluding AMI |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | $ 1,398.0 |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 1 | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  | 7.6 |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 2 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  | 24.8 |  |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  | 5.4 |  |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  | 4.7 |  |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  | $ 1,393.0 |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  | 7.28% |  |
Cost of long-term debt (percent) |  |  |  |  |  |  |  | 5.01% |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 2 | Electric average excluding AMI |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | $ 1,471.0 |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 2 | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  | 8.5 |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 3 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  | 44.1 |  |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  | 6.4 |  |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  | 5.8 |  |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  | $ 1,646.0 |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  | 7.31% |  |
Cost of long-term debt (percent) |  |  |  |  |  |  |  | 5.08% |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 3 | Electric average excluding AMI |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | $ 1,737.0 |  |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 3 | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  | $ 11.5 |  |
O&R | Gas |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred regulatory assets |  |  |  |  | $ 2.0 | $ 7.6 |  |  | $ 2.0 |
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 | 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 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 2 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  | $ 7.4 |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  |  | 0.7 |
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 3 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  | $ 9.9 |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  |  | 0.3 |
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 | 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 | Scenario, Forecast | Rate Plan for Year 1 |  |  |  |  |  |  |  |  |  |
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 | Scenario, Forecast | Rate Plan for Year 2 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  | $ 18.0 |  |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  | 8.2 |  |
O&R | Gas | Scenario, Forecast | Rate Plan for Year 3 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  | 16.5 |  |
Amortization to income of net regulatory assets |  |  |  |  |  |  |  | $ 8.0 |  |

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