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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Risk management assets $ 84.8 $ 24.4
Available-for-sale debt securities 151.6 171.8
Total 236.4 196.2
Risk management liabilities 3.0 144.2
Total 3.0 144.2
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 0.0 0.0
Risk management liabilities 0.0 0.0
Total 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Risk management assets   24.4
Available-for-sale debt securities 151.6 171.8
Total 236.4 196.2
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag   144.2
Risk management liabilities 3.0  
Total 3.0 144.2
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag 84.8  
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