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Regulatory Matters - Regulatory Proceedings (Details) - USD ($) $ in Thousands | Oct. 31, 2024 | Oct. 22, 2024 | Aug. 15, 2024 | Jul. 25, 2024 | Jul. 18, 2024 | Jun. 20, 2024 | May 30, 2024 | May 16, 2024 | Apr. 24, 2024 | Feb. 09, 2024 | Dec. 20, 2023 | Dec. 07, 2023 | Oct. 17, 2023 | May 04, 2023 | Feb. 14, 2023 | Mar. 18, 2022 | Sep. 30, 2021
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BELCO | General Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue increase, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,800 |
Rate of return (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.16% |
Equity interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62.00% |
Return on equity (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.92% |
BELCO | General Rate Case | Revenue Allowance Application, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,800
Revenue allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 224,100 |
BELCO | General Rate Case | Revenue Allowance Application, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,100
Revenue allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 226,200 |
BELCO | General Rate Review |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 59,100 |  |  |  |
Requested weighted average cost of capital (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 10.13% |  |  |  |
BELCO | General Rate Review | Revenue Allowance Application, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue increase, amount |  |  |  |  |  |  | $ 33,600 |  |  |  |  |  |  |  |  |  |
BELCO | General Rate Review | Revenue Allowance Application, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved weighted average cost of capital (percent) |  |  |  |  |  |  | 7.79% |  |  |  |  |  |  |  |  |  |
Empire District Electric - Arkansas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue increase, amount |  |  |  |  |  |  |  |  |  |  |  | $ 5,300 |  |  |  |  |
Equity interest (percent) |  |  |  |  |  |  |  |  |  |  |  | 44.00% |  |  | 56.00% |  |
Return on equity (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.25% |  |
Securitization of qualified extraordinary costs affirmed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,300 |  |
New York Water |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue increase, amount |  |  | $ 38,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Return on equity (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Securitization of qualified extraordinary costs affirmed |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,700 |  |  |
Approved revenue increase, year one amount |  |  | 26,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue increase, year two amount |  |  | 6,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue increase, year three amount |  |  | $ 6,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Midstates Gas - Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of return (percent) | 7.54% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (percent) |  |  |  |  |  |  |  |  |  |  | 54.00% |  |  |  |  |  |
Return on equity (percent) | 9.90% |  |  |  |  |  |  |  |  |  | 10.80% |  |  |  |  |  |
Securitization of qualified extraordinary costs affirmed |  |  |  |  |  |  |  |  |  |  | $ 5,300 |  |  |  |  |  |
Approved long term debt (percent) | 5.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Midstates Gas - Illinois | Illinois Commerce Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  | $ 4,600 | $ 600 |  |  |  |  |  |  |  |
Midstates Gas - Illinois | ICC Staff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 3,100 |  | $ 4,100 |  |  |  |  |  |  |  |  |  |  |
Approved revenue increase, amount | $ 3,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of return (percent) | 22.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Midstates Gas - Illinois | ICC Staff | Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 2,100 |  |  |  |  |  |  |  |  |  |  |
Midstates Gas - Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue increase, amount |  | $ 9,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (percent) |  |  |  |  |  |  |  |  |  | 52.92% |  |  |  |  |  |  |
Return on equity (percent) |  |  |  |  |  |  |  |  |  | 10.80% |  |  |  |  |  |  |
Securitization of qualified extraordinary costs affirmed |  |  |  |  |  |  |  |  |  | $ 13,200 |  |  |  |  |  |  |
Midstates Gas - Missouri | Missouri Public Service Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 4,400 |  |  |  |  |  |  |  |  |  |  |  |
Requested on equity interest (percent) |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity (percent) |  |  |  |  | 9.45% |  |  |  |  |  |  |  |  |  |  |  |
Midstates Gas - Missouri | Office Of The Public Counsel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested on equity interest (percent) |  |  |  |  | 47.50% |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity (percent) |  |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |

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