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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets    
Available-for-sale, securities $ 137.9 $ 159.1
Total 156.8 182.4
Liabilities    
Total 6.7 9.4
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 18.9 23.3
Available-for-sale, securities 137.9 159.1
Total 156.8 182.4
Liabilities    
Risk management liabilities 6.7 9.4
Total 6.7 9.4
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 137.9 159.1
Risk management assets    
Assets    
Risk management assets 18.9 23.3
Liabilities    
Risk management liabilities $ 6.7 $ 9.4