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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 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 $ 3.6 $ 2.3 $ 4.4 $ 0.8  
Other Current Liabilities [Member]          
Derivative [Line Items]          
Derivative liabilities $ 5.9   $ 5.9    
Other Noncurrent Liabilities [Member]          
Derivative [Line Items]          
Derivative liabilities         $ 6.6