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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Nov. 30, 2016
Forward Contracts [Member]      
Derivative [Line Items]      
Minimum maturity period, foreign currency derivative 30 days    
Maximum maturity period, foreign currency derivative 1 year    
Gains (losses) on foreign currency forward contracts $ 0.8 $ (1.5)  
Other Accrued Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities $ 6.7    
Other Noncurrent Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities     $ 6.6