Narrative (Details) - USD ($)						12 Months Ended
	Oct. 15, 2021	Oct. 01, 2021	Jul. 08, 2020	Apr. 06, 2020	Apr. 10, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Apr. 12, 2021	Jan. 01, 2018
Regulatory Assets [Line Items]
Depreciation and amortization						$ 663,232,000	$ 704,783,000	$ 647,755,000
Accrual for Environmental Loss Contingencies						$ 61,500,000
Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag						Environmental Remediation
Environmental Remediation Expense, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag						Environmental Remediation
Natural Gas, US Regulated [Member]
Regulatory Assets [Line Items]
Environmental Remediation Expense						$ 84,400,000
Environmental Expense and Liabilities						90,400,000	75,800,000
Electricity, US Regulated [Member]
Regulatory Assets [Line Items]
Environmental Remediation Expense						48,300,000
Environmental Expense and Liabilities						51,500,000	52,200,000
Subsidiaries [Member]
Regulatory Assets [Line Items]
Depreciation and amortization						657,349,000	704,372,000	647,546,000
Customer Bill Assistance	$ 2,500			$ 1,000
Liabilities, Other than Long-term Debt, Noncurrent	34,500,000			11,000,000
Storm Damage Costs Incurred During Period						32,200,000	51,400,000
Public Utilities, Rate Case, Deferred Storm Costs Threshold										$ 10,000,000
Public Utilities, Rate Case, Deferred Storm Qualifying Costs										$ 500,000
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 0
Subsidiaries [Member] | Natural Gas [Member]
Regulatory Assets [Line Items]
Liabilities, Other than Long-term Debt, Noncurrent	10,800,000								$ 7,700,000
Subsidiaries [Member] | Electricity [Member]
Regulatory Assets [Line Items]
Liabilities, Other than Long-term Debt, Noncurrent	$ 23,700,000								$ 20,000,000
Subsidiaries [Member] | Storm that occurred in 2020
Regulatory Assets [Line Items]
Storm Damage Costs Deferred During Period								$ 200,000
Subsidiaries [Member] | Storm that occurred in 2021
Regulatory Assets [Line Items]
Storm Damage Costs Deferred During Period						200,000	40,900,000
Subsidiaries [Member] | Storm that occurred in 2022
Regulatory Assets [Line Items]
Storm Damage Costs Deferred During Period						21,400,000
Subsidiaries [Member] | Get to Zero Deferral Filing [Member]
Regulatory Assets [Line Items]
Public Utilities, Property, Plant and Equipment, Equipment, Useful Life					10 years
Depreciation and amortization						$ 11,800,000	$ 6,600,000
Subsidiaries [Member] | General Rate Case [Member]
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 18,900,000
Subsidiaries [Member] | General Rate Case [Member] | Natural Gas, US Regulated [Member]
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		3,100,000	$ 1,300,000
Subsidiaries [Member] | General Rate Case [Member] | Electricity, US Regulated [Member]
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 15,800,000	$ 900,000