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Selling, general and administrative expenses
 12 Months Ended
Dec. 31, 2023
Other Income and Expenses [Abstract]  
Selling, general and administrative expenses Selling, general and administrative expense
The following table summarizes the Company's selling, general and administrative expense:
For the year ended December 31, 2023For the 2 months ended December 31, 2022For the year ended October 31, 2022For the year ended October 31, 2021
Employee salaries and benefits $(31.5)$(5.4)$(22.5)$(7.4)
Professional fees(20.8)(3.5)(16.3)(7.9)
Stock-based compensation(10.2)(1.8)(16.1)(3.2)
Office, administrative and travel(22.2)(3.6)(17.1)(3.2)
Depreciation(2.1)(0.1)(0.5)(0.1)
Marketing(2.5)(0.3)(2.3)(0.9)
Write-off of property, plant and equipment(2.8)— — — 
Bad debt expense(1.2)— — — 
Other
(0.1)— (0.1)— 
Total selling, general, and administrative expense$(93.4)$(14.7)$(74.9)$(22.7)
Employee salaries and benefits includes severance expense of $2.0 million for the year ended December 31, 2023 ($nil for 2 months ended December 31, 2022, year ended October 31, 2022 and year ended October 31, 2021).