OFFSETTING ASSETS AND LIABILITIES - NARRATIVE (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Dec. 31, 2021 |
|
| Offsetting Assets [Line Items] | ||
| Fair value of securities re-pledged | $ 7,230.0 | $ 9,210.0 |
| Security collateral received | 0.6 | $ 0.3 |
| Amount re-pledged with clearing organizations to meet deposit requirements | $ 234.0 | |
| Agreement One | ||
| Offsetting Assets [Line Items] | ||
| Contractual term | 30 days | |
| Contractual obligation | $ 25.0 | |
| Agreement Two | ||
| Offsetting Assets [Line Items] | ||
| Contractual term | 21 days | |
| Contractual obligation | $ 35.0 |