XML 66 R53.htm IDEA: XBRL DOCUMENT v3.25.3
Risk Management Activities (Schedule of Gains (Losses) on Commodity Price Risk Programs) (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]    
Regulatory Assets $ 5.7  
Regulatory Liabilities 23.3  
Deferred Derivative Gain (Loss)    
Derivative Instruments, Gain (Loss) [Line Items]    
Regulatory Liabilities 23,800,000 $ 28,700,000
Deferred Derivative Gain (Loss)    
Derivative Instruments, Gain (Loss) [Line Items]    
Regulatory Assets $ 10,900,000 $ 6,500,000