Income taxes - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Oct. 31, 2022	Oct. 31, 2021
Income Tax Examination [Line Items]
Operating loss carryforwards	$ 329.0	$ 204.5	$ 184.1	$ 53.4
Domestic Tax Authority
Income Tax Examination [Line Items]
Operating loss carryforwards, subject to expiration	228.1	168.0	153.2	48.7
Foreign Tax Authority
Income Tax Examination [Line Items]
Operating loss carryforwards, not subject to expiration	$ 79.7	28.7	$ 25.0	$ 4.7
Other Tax Authorities
Income Tax Examination [Line Items]
Operating loss carryforwards, subject to expiration		18.6
Operating loss carryforwards, not subject to expiration		$ 2.5