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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Nov. 30, 2018
Forward Contracts      
Derivative [Line Items]      
Minimum maturity period, foreign currency derivative 30 days    
Maximum maturity period, foreign currency derivative 1 year    
Realized and unrealized gains from forward contracts $ 0.7 $ 3.6  
Other Current Assets      
Derivative [Line Items]      
Derivative liabilities $ 0.3   $ 0.1
Other Noncurrent Liabilities      
Derivative [Line Items]      
Derivative liabilities     $ 0.3