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Regulatory Matters - Summary of Utilities Rate Plans (RECO) (Details) - RECO - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended | 23 Months Ended | 35 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2022 | Jan. 31, 2022 | Dec. 31, 2016 | Dec. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2016
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  | $ 200 |
Regulatory liabilities, amortization period | 3 years |  |  |  | 3 years |
Amortization to income of net regulatory assets | $ 9,200 |  |  | $ 4,800 | $ 25,600 |
Regulatory assets, amortization period (in years) | 3 years |  |  | 4 years | 4 years |
Average rate base | $ 262,800 |  |  | $ 229,900 | $ 178,700 |
Weighted average cost of capital (after-tax) (percent) |  | 7.08% |  | 7.11% | 7.47% |
Authorized return on common equity (percent) |  | 9.60% |  | 9.50% | 9.60% |
Cost of long-term debt (percent) |  | 4.74% |  | 4.88% | 5.37% |
Common equity ratio (percent) |  | 48.51% |  | 48.32% | 49.70% |
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 |  |  |  |  |
Electric |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Plan electric system storm hardening amount |  |  |  |  |  | $ 15,700
Plan period (years) |  |  | 3 years |  |  |
Rate Plan for Year 1 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Base rate changes |  | $ 9,650 |  | $ 12,000 | $ 1,700 |
Actual return on common equity (percent) | 9.60% |  |  | 5.40% | 7.50% |
Rate Plan for Year 2 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Actual return on common equity (percent) |  |  |  | 2.30% | 5.70% |
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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