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Regulatory Matters - Summary of Utilities Rate Plans (RECO) (Details) - RECO - USD ($) $ in Thousands |  | 1 Months Ended | 23 Months Ended
--- | --- | --- | ---
Jan. 01, 2022 | Jan. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory liabilities, amortization period | 3 years |  |
Amortization to income of net regulatory assets | $ 9,200 |  | $ 4,800
Regulatory assets, amortization period (in years) | 3 years |  | 4 years
Weighted average cost of capital (after-tax) | $ 262,800 |  | $ 229,900
Weighted average cost of capital (after-tax) (percent) |  | 7.08% | 7.11%
Authorized return on common equity (percent) |  | 9.60% | 9.50%
Cost of long-term debt (percent) |  | 4.74% | 4.88%
Common equity ratio (percent) |  | 48.51% | 48.32%
Tropical Storm Henri |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization to income of net regulatory assets | $ 2,400 |  |
Regulatory assets, amortization period (in years) | 3 years |  |
Rate Plan for Year 1 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Base rate changes |  | $ 9,650 | $ 12,000
Actual return on common equity (percent) | 9.60% |  | 5.40%
Rate Plan for Year 2 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Actual return on common equity (percent) | 9.70% |  | 2.30%
Period 1 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortizations to income of net regulatory (assets) and liabilities | $ 200 |  |
Regulatory liabilities, amortization period | 3 years |  |
Period 2 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortizations to income of net regulatory (assets) and liabilities | $ 10,000 |  |

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