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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 23.3 $ 84.8
Derivative Liability 9.4 3.0
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 1.1 18.8
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 7.5 1.1
Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 22.2 66.0
Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 1.9 1.9
Commodity price risk programs | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 1.1 18.8
Commodity price risk programs | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 7.5 1.1
Commodity price risk programs | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 22.2 66.0
Commodity price risk programs | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 1.9 $ 1.9