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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Assets    
Total $ 172.8 $ 158.6
Liabilities    
Total 326.6 146.6
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 28.2 4.4
Available-for-sale securities 144.6 154.2
Total 172.8 158.6
Liabilities    
Risk management liabilities 326.6 146.6
Total 326.6 146.6
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 144.6 154.2
Risk management assets    
Assets    
Risk management assets 28.2 4.4
Liabilities    
Risk management liabilities $ 326.6 $ 146.6