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Other assets
 9 Months Ended
Sep. 30, 2023
Miscellaneous non-current assets [abstract]  
Other assets Other assets
As at September 30, 2023December 31, 2022
Prepaid lease deposits$5.0$2.4
Prepaid insurance 1.71.8
Restoration deposit3.2—
Restricted cash2.2—
Total other assets$12.1$4.2