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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets $ 39.5 $ 10.6
Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets 47.6 13.8
Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 69.3 136.8
Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 1.8 7.4
Interest Rate Risk | Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets 0.0 0.0
Interest Rate Risk | Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets 0.0 0.0
Interest Rate Risk | Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 68.1 136.4
Interest Rate Risk | Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 0.0 0.0
Commodity Price Risk Programs | Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets 39.5 10.6
Commodity Price Risk Programs | Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets 47.6 13.8
Commodity Price Risk Programs | Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 1.2 0.4
Commodity Price Risk Programs | Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities $ 1.8 $ 7.4