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Commitments and Contingencies (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2015
Operating Leased Assets [Line Items]      
2018 $ 8.3    
2019 7.6    
2020 4.7    
2021 2.5    
2022 1.8    
Thereafter 5.8    
Rental expense on operating leases $ 8.1 $ 7.5 $ 8.5
Minimum      
Operating Leased Assets [Line Items]      
Noncancelable operating leases, term 3 years    
Maximum      
Operating Leased Assets [Line Items]      
Noncancelable operating leases, term 5 years    
Noncancelable operating leases, renewal term 5 years