Accounts payable and accrued liabilities - Schedule of accounts payable and accrued liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accounts payable	$ 108.4	$ 134.5
Accrued expenses	17.4	14.5
Accrued compensation	6.8	3.1
Total accounts payable and accrued liabilities	132.6	152.1
Non-current accounts payable	(3.3)	0.0
Current accounts payable and accrued liabilities	$ 129.3	$ 152.1