Regulation and Rates - Climate Commitment Act Deferral and Natural Gas (Details) - Subsidiaries - USD ($) $ in Millions |
Jan. 01, 2026 |
Jun. 30, 2026 |
|---|---|---|
| Electricity, US Regulated [Member] | ||
| Regulatory Assets [Line Items] | ||
| Purchased allowances net obligation costs collected in rates, Regulatory Asset | $ 14.4 | |
| Value no cost allowances passed back to customers that exceeded usage, Regulatory Asset | 98.2 | |
| Electricity, US Regulated [Member] | Climate Commitment Act | ||
| Regulatory Assets [Line Items] | ||
| Public Utilities, Approved Rate Increase (Decrease), Amount | $ (259.0) | |
| Public Utilities, Approved Rate Increase (Decrease), Percentage | (7.20%) | |
| Natural Gas, US Regulated [Member] | ||
| Regulatory Assets [Line Items] | ||
| Deferred Emission Compliance Costs, Regulatory Liability | 15.2 | |
| Deferred Emission Compliance Auction Proceeds, Regulatory Liability | $ 76.2 |