Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Financial Instruments with Off-Balance Sheet Risk [Abstract] | |||||
| Margin loans extended | $ 394.2 | $ 403.8 | |||
| Receivables from customers | 79.9 | $ 84.4 | |||
| Unsettled customer transactions | |||||