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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Assets    
Available-for-sale, securities $ 161.9 $ 151.6
Total 200.3 236.4
Liabilities    
Total 3.2 3.0
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 38.4 84.8
Available-for-sale, securities 161.9 151.6
Total 200.3 236.4
Liabilities    
Risk management liabilities 3.2 3.0
Total 3.2 3.0
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 161.9 151.6
Risk management assets    
Assets    
Risk management assets 38.4 84.8
Liabilities    
Risk management liabilities $ 3.2 $ 3.0