INVESTMENTS - Other Investments Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | |||||
| Other investments | $ 0.0 | $ 0.0 | $ 4.4 | ||
| Other investments, impairment loss | 4.4 | $ 0.0 | 4.4 | $ 0.0 | |
| Realized gains (losses) on investments | 0.0 | $ 0.0 | 0.0 | $ 0.0 | |
| Amortized costs of special deposits | 13.7 | 13.7 | 15.7 | ||
| Fair value of special deposits | 13.8 | 13.8 | 15.9 | ||
| Balances held in the trust | $ 87.5 | $ 87.5 | $ 77.0 | ||