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Commitments and Contingencies - Lease costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Lease cost        
Operating lease cost $ 1.2 $ 1.8 $ 2.6 $ 3.7
Variable lease cost $ 0.2 $ 0.5 0.5 1.0
Operating cash flows from operating leases     $ 3.0 $ 3.8