Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Other, Net	$ 6,645,873	$ 6,135,212
Property, plant and equipment	9,124,134	8,468,967
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	$ (2,478,261)	(2,333,755)
Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	2.70%
Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	3.20%
Regulated Operation
Property, Plant and Equipment [Abstract]
Interest Costs Capitalized	$ 8,200	5,700	$ 4,500
Property, Plant and Equipment [Line Items]
Interest Costs Capitalized	8,200	5,700	4,500
Construction in Progress Expenditures Incurred but Not yet Paid	33,700	36,200	$ 28,600
Property, plant and equipment		8,468,967
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(2,478,261)	(2,333,755)
Regulated Operation | Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,278,542	6,716,074
Regulated Operation | Gas Transmission Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	736,229	713,505
Regulated Operation | Land, Buildings and Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	942,677	907,946
Regulated Operation | Construction in Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 166,686	$ 131,442