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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 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    
Gain (loss) on foreign currency forward contracts $ (2.0) $ 6.7 $ (1.3) $ 3.1  
Other Current Liabilities          
Derivative [Line Items]          
Derivative liabilities $ 1.5   $ 1.5   $ 0.3
Other Assets          
Derivative [Line Items]          
Derivative liabilities         $ 0.1