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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 27.0 $ 23.3
Derivative Liability 3.5 9.4
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 9.1 1.1
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.3 7.5
Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 17.9 22.2
Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 1.2 1.9
Commodity price risk programs | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 9.1 1.1
Commodity price risk programs | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.3 7.5
Commodity price risk programs | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 17.9 22.2
Commodity price risk programs | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 1.2 $ 1.9