Accounts payable and accrued liabilities - Schedule of accounts payable and accrued liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accounts payable	$ 109.9	$ 134.5
Accrued expenses	18.7	14.5
Accrued compensation	7.4	3.1
Total accounts payable and accrued liabilities	136.0	152.1
Non-current accounts payable	(6.3)	0.0
Current accounts payable and accrued liabilities	$ 129.7	$ 152.1