Effective rate, including composite rate, of cost of financing additions to qualifying regulated assets, commonly called allowance for funds used during construction.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478698/980-835-25-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479123/980-835-45-1

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- Definition

Percentage of public utility's approved debt to capital, including debt and equity.

+ References

No definition available.

+ Details

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- Definition

Percentage of public utility's approved equity to capital, including debt and equity.

+ References

No definition available.

+ Details

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- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Percentage of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

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- Definition

Percentage of public utility's approved return on equity.

+ References

No definition available.

+ Details

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- Definition

Percentage of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

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- Definition

Percentage of public utility's requested return on equity.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Regulation and Rates - General Rate Case (Details) - Subsidiaries - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2029	Dec. 31, 2028	Dec. 31, 2027	Dec. 31, 2026	Dec. 31, 2025
General Rate Case \| High
Regulatory Assets [Line Items]
Public Utilities, Approved Debt Capital Structure, Percentage					7.52%
Public Utilities, Approved Equity Capital Structure, Percentage					49.00%
Public Utilities, Approved Return on Equity, Percentage					9.80%
Forecast
Regulatory Assets [Line Items]
Public Utilities, Allowance for Funds Used During Construction, Rate	8.20%	8.20%	8.10%
Forecast \| General Rate Case \| High
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.80%	10.80%	10.80%
Public Utilities, Approved Debt Capital Structure, Percentage				7.64%
Public Utilities, Approved Equity Capital Structure, Percentage				50.00%
Public Utilities, Approved Return on Equity, Percentage				9.90%
Electricity, US Regulated [Member] \| General Rate Case
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 378.2
Public Utilities, Approved Rate Increase (Decrease), Percentage					13.30%
Electricity, US Regulated [Member] \| Forecast \| General Rate Case
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage	8.70%	3.70%	15.20%
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 191.0
Public Utilities, Approved Rate Increase (Decrease), Percentage				5.90%
Natural Gas, US Regulated [Member] \| General Rate Case
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 110.0
Public Utilities, Approved Rate Increase (Decrease), Percentage					10.60%
Natural Gas, US Regulated [Member] \| Forecast \| General Rate Case
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage	3.60%	3.20%	14.20%
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 20.0
Public Utilities, Approved Rate Increase (Decrease), Percentage				1.80%