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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Assets    
Total $ 178.7 $ 184.1
Liabilities    
Total 148.6 222.8
Fair Value, Inputs, Level 1    
Assets    
Risk management assets 0.0 0.0
Available-for-sale securities 0.0 0.0
Total 0.0 0.0
Liabilities    
Risk management liabilities 0.0 0.0
Total 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Assets    
Risk management assets 12.4 13.2
Available-for-sale securities 166.3 170.9
Total 178.7 184.1
Liabilities    
Risk management liabilities 148.6 222.8
Total 148.6 222.8
Significant Unobservable Inputs (Level 3)    
Assets    
Risk management assets 0.0 0.0
Available-for-sale securities 0.0 0.0
Total 0.0 0.0
Liabilities    
Risk management liabilities 0.0 0.0
Total 0.0 0.0
Available-for-sale Securities    
Assets    
Available-for-sale securities 166.3 170.9
Risk management assets    
Assets    
Risk management assets 12.4 13.2
Liabilities    
Risk management liabilities $ 148.6 $ 222.8