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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Payables and Accruals [Abstract]    
Accounts payable $ 12.3 $ 31.3
Accrued liabilities    
Research and development expenses 18.9 9.5
Employee expenses 8.7 12.4
Professional fees and other 2.2 1.2
Total accounts payable and accrued liabilities $ 42.1 $ 54.4