Commitments and Contingencies - Lease costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Lease cost
Operating lease costs	$ 1.2	$ 1.2	$ 2.4	$ 2.6
Variable lease costs	$ 0.3	$ 0.2	0.7	0.5
Cash flows from operating leases			$ 3.4	$ 3.0