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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 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 $ 5.2 $ 2.2 $ 9.6 $ 1.4  
Other Current Liabilities [Member]          
Derivative [Line Items]          
Derivative liabilities $ 3.5   $ 3.5    
Other Noncurrent Liabilities [Member]          
Derivative [Line Items]          
Derivative liabilities         $ 6.6