Rates and Other Regulatory Activities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2025 USD ($) Dekatherm	Jun. 30, 2024	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Rates and Other Regulatory Activities [Line Items]
Regulatory Liabilities	$ (84,000,000.0)			$ 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	2,800,000
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