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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Risk management assets $ 24.4 $ 13.2
Available-for-sale debt securities 171.8 170.9
Total 196.2 184.1
Risk management liabilities 144.2 222.8
Total 144.2 222.8
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 13.2
Available-for-sale debt securities 171.8 170.9
Total 196.2 184.1
Risk management liabilities 144.2 222.8
Total 144.2 222.8
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