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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Assets    
Available-for-sale securities $ 128.2 $ 131.5
Total 167.1 180.5
Liabilities    
Total 65.3 61.3
Fair Value, Inputs, Level 1    
Assets    
Risk management assets 1.5 5.4
Available-for-sale securities 0.0 0.0
Total 1.5 5.4
Liabilities    
Risk management liabilities 1.8 1.2
Total 1.8 1.2
Significant Other Observable Inputs (Level 2)    
Assets    
Risk management assets 37.0 43.6
Available-for-sale securities 128.2 131.5
Total 165.2 175.1
Liabilities    
Risk management liabilities 63.5 58.9
Total 63.5 58.9
Significant Unobservable Inputs (Level 3)    
Assets    
Risk management assets 0.4 0.0
Available-for-sale securities 0.0 0.0
Total 0.4 0.0
Liabilities    
Risk management liabilities 0.0 1.2
Total 0.0 1.2
Available-for-sale Securities    
Assets    
Available-for-sale securities 128.2 131.5
Risk management assets    
Assets    
Risk management assets 38.9 49.0
Liabilities    
Risk management liabilities $ 65.3 $ 61.3