v3.26.1
Risk Management Activities (Schedule of Gains (Losses) on Commodity Price Risk Programs) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Deferred Derivative Gain (Loss)    
Derivative Instruments, Gain (Loss) [Line Items]    
Regulatory Liabilities $ 12.2 $ 19.2
Deferred Derivative Gain (Loss)    
Derivative Instruments, Gain (Loss) [Line Items]    
Regulatory Assets $ 20.3 $ 10.1