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Mexican IVA taxes receivable (Details)
$ in Millions, $ in Millions
Jul. 31, 2020
USD ($)
Jul. 31, 2020
MXN ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2019
MXN ($)
Mexican IVA taxes receivable        
IVA receivables balance $ 27.7 $ 614.2 $ 27.6 $ 529.6