BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Product Information [Line Items] | ||||
| General, administrative, and other costs | $ 104.9 | $ 93.9 | $ 197.3 | $ 183.6 |
| Technology, occupancy, and facility costs | $ 205.9 | 195.0 | $ 410.3 | 376.2 |
| Revision of Prior Period, Adjustment | ||||
| Product Information [Line Items] | ||||
| General, administrative, and other costs | (15.5) | (29.1) | ||
| Technology, occupancy, and facility costs | $ 15.5 | $ 29.1 | ||