Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Payables and Accruals [Abstract]
Accounts payable	$ 18.0	$ 13.4
Accrued liabilities
Research and development expenses	16.6	25.9
Employee expenses	12.9	22.4
Income taxes	3.8	3.2
General and administrative and commercial expenses	3.2	5.1
Professional fees	1.0	1.8
Total accounts payable and accrued liabilities	$ 55.5	$ 71.8