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Contingencies and Commitments Contingencies and Commitments (Leases) (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2014
Operating Leased Assets [Line Items]      
Rent expense $ 6.3 $ 5.9 $ 6.9
Total non-cancelable operating leases 32.8    
Non-cancelable operating leases due in 2017 4.7    
Non-cancelable operating leases due in 2018 3.6    
Non-cancelable operating leases due in 2019 3.0    
Non-cancelable operating leases due in 2020 2.5    
Non-cancelable operating leases due in 2021 1.7    
Non-cancelable operating leases due Thereafter $ 17.3    
Minimum [Member]      
Operating Leased Assets [Line Items]      
Renewal option period 5 years    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Renewal option period 20 years