LONG-TERM INCENTIVE COMPENSATION - Schedule of Restricted Fund Units Liability (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Deferred Compensation Arrangement With Individual, Share-Based Payments [Roll Forward] | ||
| Balance at beginning of period | $ 1,176.8 | |
| Balance at June 30 | 1,268.5 | |
| Restricted Fund Units | ||
| Deferred Compensation Arrangement With Individual, Share-Based Payments [Roll Forward] | ||
| Balance at beginning of period | 54.7 | $ 14.7 |
| Amortization of grant date value | 35.2 | 22.9 |
| Amortization of market appreciation (depreciation) | 10.3 | 2.3 |
| Forfeitures | (3.0) | 0.0 |
| Balance at June 30 | $ 97.2 | $ 39.9 |