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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Risk management assets $ 27.0 $ 23.3
Available-for-sale debt securities 86.7 159.1
Total 193.8 182.4
Risk management liabilities 3.5 9.4
Total 3.5 9.4
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 80.1  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Risk management assets 0.0 0.0
Available-for-sale debt securities 0.0 0.0
Total 80.1 0.0
Risk management liabilities 0.0 0.0
Total 0.0 0.0
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 80.1  
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Risk management assets   23.3
Available-for-sale debt securities 86.7 159.1
Total 113.7 182.4
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag   9.4
Risk management liabilities 3.5  
Total 3.5 9.4
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag 27.0  
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 0.0  
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Risk management assets 0.0 0.0
Available-for-sale debt securities 0.0 0.0
Total 0.0 0.0
Risk management liabilities 0.0 0.0
Total 0.0 $ 0.0
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value $ 0.0