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Other income (expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2020
Financial Instruments [Abstract]      
Interest income $ 7.0 $ 0.1 $ 0.0
Interest expense and accretion on convertible debt (15.0) (1.2) 0.0
Interest expense and accretion on promissory notes 0.0 (0.1) 0.0
Interest expense and accretion on loans 0.0 (1.3) 0.0
Interest expense on leases 2.2 0.4 0.2
Other finance costs (0.2) 0.0 (0.3)
Foreign exchange gains (losses) 0.4 (0.8) 0.4
Interest expense and other costs (17.0) (3.8) (0.1)
Fair value (gain) loss on embedded derivative 31.3 (1.3) 0.0
Fair value gain (loss) on warrants 36.2 (33.8) 0.0
Fair value gain (loss) on restricted share units 0.0 (3.2) (0.1)
Gains (losses) on financial instruments 67.5 (38.3) (0.1)
Excess of fair value over consideration transferred 0.0 152.7 0.0
Other income (expense) $ (57.5) $ 194.7 $ 0.2