CLEARING HOUSE PERFORMANCE BONDS AND GUARANTEE FUNDS - Schedule of Performance Bonds and Guarantee Funds (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Deposit Assets [Line Items] | ||
| Margin deposits | $ 340,006 | $ 248,757 |
| Security deposits | 60,920 | 56,989 |
| Other | 5,751 | |
| Total performance bonds and guarantee funds | 406,677 | 305,746 |
| Cash | ||
| Deposit Assets [Line Items] | ||
| Margin deposits | 34,801 | 22,073 |
| Security deposits | 52,510 | 48,005 |
| Other | 5,751 | |
| Total performance bonds and guarantee funds | 93,062 | 70,078 |
| US Treasury Bills | ||
| Deposit Assets [Line Items] | ||
| Margin deposits | 305,205 | 226,684 |
| Security deposits | 8,410 | 8,984 |
| Other | 0 | |
| Total performance bonds and guarantee funds | $ 313,615 | $ 235,668 |