STOCKHOLDERS' DEFICIT - Stock-based compensation (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Stock Based Compensation Expense | ||||
| Stock-based compensation expense | $ 3.3 | $ 6.0 | $ 10.6 | $ 11.7 |
| Total estimated unrecognized compensation cost related to nonvested stock-based compensation arrangements | 7.5 | $ 7.5 | ||
| Weighted average period recognized | 10 months | |||
| Board of director stock award expense | ||||
| Stock Based Compensation Expense | ||||
| Stock-based compensation expense | $ 1.1 | 1.3 | ||
| Special awards expense | ||||
| Stock Based Compensation Expense | ||||
| Stock-based compensation expense | 4.6 | 1.0 | ||
| Restricted stock unit expense | ||||
| Stock Based Compensation Expense | ||||
| Stock-based compensation expense | 1.5 | 3.6 | 2.9 | 6.2 |
| Performance stock unit expense | ||||
| Stock Based Compensation Expense | ||||
| Stock-based compensation expense | $ 1.8 | $ 2.4 | $ 2.0 | $ 3.2 |