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Accounts Payable and Accrued Liabilities - Components of Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Payables and Accruals [Abstract]    
Accounts payable $ 5.7 $ 31.3
Accrued liabilities    
Research and development expenses 35.9 9.5
Employee expenses 18.7 12.4
Income taxes 10.3 0.0
Professional fees and other 4.1 1.2
Accounts payable and accrued liabilities $ 74.7 $ 54.4