General Rate Case Filing (Details) - Subsidiaries [Member] - USD ($) $ in Millions									12 Months Ended
	Oct. 01, 2021	Sep. 28, 2021	Oct. 15, 2020	Sep. 30, 2020	Jul. 31, 2020	Jul. 08, 2020	Jun. 20, 2019	Dec. 19, 2017	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2021
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Debt Capital Structure, Percentage								7.60%
General Rate Case [Member]
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 18.9
Annual Revenue Requirement				$ 25.6
Regulatory assets and additional revenues												$ 24.5
Revenue Not from Contract with Customer, Other												$ 5.6
General Rate Case [Member] | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Debt Capital Structure, Net of Tax, Percentage						6.80%
Public Utilities, Approved Equity Capital Structure, Percentage						48.50%
Public Utilities, Approved Return on Equity, Percentage						9.40%
Forecast | General Rate Case [Member]
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulated Utility, Allowed Rate of Return on Net Regulatory Assets and Liabilities									7.49%	7.44%	7.39%
Forecast | General Rate Case [Member] | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Return on Equity, Percentage									9.90%	9.90%	9.90%
Electricity, US Regulated [Member]
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Debt Capital Structure, Percentage			7.39%
Electricity, US Regulated [Member] | General Rate Case [Member]
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage							6.90%
Public Utilities, Interim Rate Increase (Decrease), Amount		$ 48.3			$ 59.6	$ 29.5
Public Utilities, Interim Rate Increase (Decrease), Percentage		2.30%				1.60%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 15.8					$ 0.9
Public Utilities, Approved Rate Increase (Decrease), Percentage	0.70%					0.05%
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount		$ 77.1
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage		3.70%
PublicUtilitiesIncremenalRateIncreaseDecreaseAmount		$ 17.5
Electricity, US Regulated [Member] | Forecast | General Rate Case [Member]
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage									1.20%	2.50%	13.60%
Natural Gas, US Regulated [Member] | General Rate Case [Member]
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage							7.90%
Public Utilities, Interim Rate Increase (Decrease), Amount		$ 4.9			$ 42.9	$ 36.5
Public Utilities, Interim Rate Increase (Decrease), Percentage		0.60%				4.00%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 3.1					$ 1.3
Public Utilities, Approved Rate Increase (Decrease), Percentage	0.30%					0.15%
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount		$ 45.3
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage		5.90%
PublicUtilitiesIncremenalRateIncreaseDecreaseAmount		$ 2.4
Natural Gas, US Regulated [Member] | Forecast | General Rate Case [Member]
Schedule of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage									1.80%	2.30%	13.00%