Accounting for Derivative Instruments and Hedging Activities - Narrative (Details) $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2026
USD ($)
| |
| Electricity, US Regulated [Member] | |
| Derivative [Line Items] | |
| Posted Collateral | $ 52.3 |
| Natural gas derivative instruments | |
| Derivative [Line Items] | |
| Posted Collateral | 0.0 |
| Natural gas derivative instruments | Credit rating2 | Standby Letters of Credit | |
| Derivative [Line Items] | |
| Posted Collateral | $ 8.0 |
| External Credit Rating, Investment Grade | |
| Derivative [Line Items] | |
| Derivative, Credit Risk Exposure, Percentage | 99.30% |
| External Credit Rating, Non Investment Grade | |
| Derivative [Line Items] | |
| Derivative, Credit Risk Exposure, Percentage | 0.70% |
| Subsidiaries | |
| Derivative [Line Items] | |
| Hedging strategy number of years extended | 3 years |