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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Nov. 30, 2017
Forward Contracts          
Derivative [Line Items]          
Minimum maturity period, foreign currency derivative     30 days    
Maximum maturity period, foreign currency derivative     1 year    
Loss (gain) on foreign currency forward contracts $ 1.0 $ (5.2) $ 4.1 $ (9.6)  
Other Current Liabilities          
Derivative [Line Items]          
Derivative liabilities $ 1.8   $ 1.8   $ 0.2
Other Assets          
Derivative [Line Items]          
Derivative liabilities         $ 0.2