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Mexican IVA taxes receivable (Details)
$ in Millions, $ in Millions
Apr. 30, 2021
USD ($)
Apr. 30, 2021
MXN ($)
Oct. 31, 2020
USD ($)
Oct. 31, 2020
MXN ($)
Mexican IVA taxes receivable        
IVA receivables balance $ 35.0 $ 705.8 $ 30.2 $ 640.7