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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Assets    
Available-for-sale, securities $ 149.8 $ 171.8
Total 255.4 196.2
Liabilities    
Total 11.5 144.2
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 105.6 24.4
Available-for-sale, securities 149.8 171.8
Total 255.4 196.2
Liabilities    
Risk management liabilities 11.5 144.2
Total 11.5 144.2
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 149.8 171.8
Risk management assets    
Assets    
Risk management assets 105.6 24.4
Liabilities    
Risk management liabilities $ 11.5 $ 144.2