Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment by Classification (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) mi	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Contributions in Aid of Construction	$ 7,600	$ 6,300
Public Utilities, Allowance for Funds Used During Construction, Description	$ 100	400	$ 700
Number of Months to Establish ROU Asset and Liability	12 months
Property, plant and equipment
Total property, plant and equipment	$ 2,226,104	2,112,964
Less: Accumulated depreciation and amortization	(462,926)	(417,479)
Net property, plant and equipment	1,810,473	1,744,878
Construction Work in Progress	47,295	49,393
Jointly Owned Pipeline [Member]
Property, plant and equipment
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment	1,500	900
Natural Gas Distribution [Member] | Delmarva and Florida [Member]
Property, plant and equipment
Total property, plant and equipment	925,501	859,627
Natural Gas Transmission [Member] | Delmarva Peninsula, Pennsylvania and Florida [Member]
Property, plant and equipment
Total property, plant and equipment	741,865	727,277
Natural Gas Transmission [Member] | OHIO
Property, plant and equipment
Total property, plant and equipment	128,620	112,050
Electric distribution | Florida
Property, plant and equipment
Total property, plant and equipment	135,633	133,383
Propane Operations [Member] | Mid-Atlantic and Florida [Member]
Property, plant and equipment
Total property, plant and equipment	185,090	176,095
Electricity and Steam Generation [Member] | Florida
Property, plant and equipment
Total property, plant and equipment	36,886	36,740
Mobile CNG Utility and Pipeline Solutions [Member] | Florida
Property, plant and equipment
Total property, plant and equipment	38,543	32,374
Other
Property, plant and equipment
Total property, plant and equipment	29,890	35,418
Other unregulated energy | Other [Member]
Property, plant and equipment
Total property, plant and equipment	$ 4,076	$ 0
Natural Gas Operations
Property, plant and equipment
Miles Of Natural Gas Pipeline | mi	26
Jointly Owned Pipeline [Member]
Property, plant and equipment
Net property, plant and equipment	$ 28,300