Accounts payable and accrued liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accounts payable	$ 110.8	$ 134.5
Accrued expenses	23.3	14.5
Accrued compensation	8.4	3.1
Total accounts payable and accrued liabilities	142.5	152.1
Non-current accounts payable and accrued liabilities	(1.5)	0.0
Total accounts payable and accrued liabilities	$ 141.0	$ 0.0