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Other Assets - Amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 0.7 $ 1.1 $ 1.2
Amortization expense for 2020 0.1    
Amortization expense for 2021 0.1    
Amortization expense for 2022 0.1    
Amortization expense for 2023 $ 0.1