XML 66 R55.htm IDEA: XBRL DOCUMENT v3.24.2.u1
Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets $ 5.2 $ 1.1
Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets 21.3 22.2
Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 5.1 7.5
Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 2.9 1.9
Commodity Price Risk Programs | Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets 5.2 1.1
Commodity Price Risk Programs | Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets 21.3 22.2
Commodity Price Risk Programs | Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 5.1 7.5
Commodity Price Risk Programs | Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities $ 2.9 $ 1.9