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Derivative Instruments And Hedging Activities (Narrative) (Details) - Designated As Hedging Instrument - Interest Rate Swaps - Cash Flow Hedging - USD ($)
$ in Millions
3 Months Ended
May 31, 2018
Feb. 28, 2018
Derivative [Line Items]    
Additional reclassification from AOCL to CAF income within the next 12 months $ 6.2  
Derivative notional amount $ 2,280.0 $ 2,160.0