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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Payables and Accruals [Abstract]    
Accounts payable $ 12.3 $ 5.7
Accrued liabilities    
Research and development expenses 34.9 35.9
Income taxes 10.1 10.3
Employee expenses 7.2 18.7
Professional fees and other 1.5 4.1
Total accounts payable and accrued liabilities $ 66.0 $ 74.7