Stock-based compensation - other information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Other information about options outstanding | ||||
| Remaining expense to be recognized | $ 103.8 | $ 103.8 | ||
| Weighted average period over which remaining expense will be recognized (in years) | 1 year 9 months 18 days | |||
| Restricted stock expense | $ 2.7 | $ 4.8 | $ 1.8 | |
| Restricted stock expense | $ 0.5 | |||
| Stock options | ||||
| Other information about options outstanding | ||||
| Contractual life (in years) | 10 years | |||
| Award vesting period (in years) | 3 years | |||