v3.25.4
Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 18.8  
Derivative Liability 5.9 $ 3.5
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 9.7 9.1
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.1 2.3
Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 9.1 17.9
Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 3.8 1.2
Commodity price risk programs | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 9.7 9.1
Commodity price risk programs | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.1 2.3
Commodity price risk programs | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 9.1 17.9
Commodity price risk programs | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 3.8 $ 1.2