v3.26.1
Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsCurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets $ 2.9 $ 9.7
Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsNoncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets 8.7 9.1
Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesCurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 3.5 2.1
Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesNoncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 10.8 3.8
Commodity Price Risk Programs | Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsCurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets 2.9 9.7
Commodity Price Risk Programs | Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsNoncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets 8.7 9.1
Commodity Price Risk Programs | Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesCurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 3.5 2.1
Commodity Price Risk Programs | Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesNoncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities $ 10.8 $ 3.8