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Rates and Other Regulatory Activities - Additional Information (Detail) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) Dekatherm | Sep. 30, 2024 | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Regulatory Liabilities | $ (83,700,000) |  |  | $ 84,600,000
Gas Utility Access and Replacement Directive Related Capital Expenditures | 205,000,000 |  |  |
RSAM |  |  | $ 25,000,000 |
Safety, Access, and Facility Enhancement Capital Expenditures | 50,000,000.0 |  |  |
Total Projected Capital Expenditures | 255,000,000 |  |  |
Safety, Access, and Facility Enhancement Capital Expenditures | $ 205,000,000 |  |  |
Number of Miles of Distribution Mains | 150 | 160 |  |
Environmental liabilities | $ 2,800,000 |  |  | 2,200,000
Depreciation Study Impact | 1,200,000 |  |  |
Eastern Shore Gas Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Number of Miles of Distribution Mains |  | 5.5 |  |
Maryland Natural Gas [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Permanent Rates | 6,900,000 |  |  |
Annual Rate Case Recovery | $ 2,600,000 |  |  |
Rate Case ROE | 11.50% |  |  |
Total Rate Case Recovery | $ 3,500,000 |  |  |
Incremental Rate Case Recovery | 900,000 |  |  |
Florida City Gas |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Total Base Rate Increase |  |  | 23,300,000 |
Base Rate Increase - liquefied natural gas facility |  |  | 3,800,000 |
Base Rate Increase Base - SAFE investments transfer to base rates |  |  | 5,300,000 |
Base Rate Increase |  |  | 14,100,000 |
Florida City Gas | Storm Reserve |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Regulatory Liabilities |  |  | 800,000 |
Florida Electric Distribution |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Permanent Rates | 8,600,000 |  |  |
Annual Rate Case Recovery | $ 1,800,000 |  |  |
Cost Recovery Storm Protection Plan |  |  | $ 20,400,000 |
Rate Case ROE | 11.30% |  |  |
Proprosed Rates | $ 12,600,000 |  |  |
Deferred Annual Rate Case Recovery | 1,000,000.0 |  |  |
Step Up Rate Case Recovery | 700,000 |  |  |
West Palm Beach Florida [Member] | Minimum [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Estimated costs of remediation range, minimum | 2,500,000 |  |  |
West Palm Beach Florida [Member] | Maximum [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Estimated costs of remediation range, minimum | 5,200,000 |  |  |
Delaware natural gas division [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Interim Rates | 2,500,000 |  |  |
Permanent Rates | 12,100,000 |  |  |
Annual Rate Case Recovery | $ 6,100,000 |  |  |
Rate Case ROE | 11.50% |  |  |
Florida Public Utilities Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Environmental liabilities | $ 3,100,000 |  |  | $ 3,200,000
Eastern Shore Gas Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Regulatory Liabilities | $ 34,200,000 |  |  |
Newberry Expansion | Peninsula Pipeline Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Additional Firm Natural Gas Transportation Deliverability | Dekatherm | 8,000 |  |  |
East Coast Reinforcement Projects: Boynton Beach | Peninsula Pipeline Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Additional Firm Natural Gas Transportation Deliverability | Dekatherm | 15,000 |  |  |
East Coast Reinforcement Projects: New Smyrna Beach | Peninsula Pipeline Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Additional Firm Natural Gas Transportation Deliverability | Dekatherm | 3,400 |  |  |
Central Florida Reinforcement Projects | Peninsula Pipeline Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Additional Firm Natural Gas Transportation Deliverability | Dekatherm | 8,700 |  |  |
Central Florida Reinforcement Projects: Plant City | Peninsula Pipeline Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Additional Firm Natural Gas Transportation Deliverability | Dekatherm | 5,000 |  |  |
St. Cloud Project Amendment | Peninsula Pipeline Company [Member] |  |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |  |
Additional Firm Natural Gas Transportation Deliverability | Dekatherm | 10,000 |  |  |

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