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Income Taxes - Unrecognized Tax Benefits Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance, December 1 $ 0.6 $ 0.3 $ 0.3
Increase based on tax positions related to current year 0.1 0.0 0.0
Increase due to acquisition 0.0 0.3 0.0
Ending balance, November 30 $ 0.6 $ 0.6 $ 0.3