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Earnings (loss) per share (Tables)
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted Earnings (loss) per share
Year ended December 31, 2023
2 months ended December 31, 2022
Year ended October 31, 2022
Year ended October 31, 2021
Total net income (loss)$(138.0)$1.6$(50.3)$(70.5)
Weighted average number of common shares (in millions)177.5176.0170.7110.1
Effect of dilutive securities:
Stock options— 2.1 — — 
Restricted share units— 2.0 — — 
Dilutive number of shares$177.5 $180.1 $170.7 $110.1 
Basic and diluted earnings (loss) per share
$(0.78)$0.01$(0.29)$(0.64)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share The following table presents shares from instruments that could dilute basic loss per share in the future, but were not included in the calculation of diluted loss per share because they are antidilutive for the periods presented:
As atDecember 31, 2023December 31, 2022October 31, 2022October 31, 2021
Stock options$3.7 $4.4 $4.5 $5.3 
Warrants— — — 23.0 
Convertible debt
KSP Convertible Notes9.6 8.5 8.4 7.5 
Glencore Convertible Notes23.7 21.4 21.0 — 
Restricted share units9.9 2.0 2.0 0.7 
Total$46.9 $36.3 $35.9 $36.5