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Legal Proceedings (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Jun. 30, 2025
Loss Contingencies [Line Items] |  |
Possible aggregate loss |  | $ 100.0
Customer Arbitration Against the Company's Brokerage Subsidiary | $ 132.5 |
Compensatory Damages [Member] |  |
Loss Contingencies [Line Items] |  |
Customer Arbitration Against the Company's Brokerage Subsidiary | 26.5 |
Punitive Damages [Member] |  |
Loss Contingencies [Line Items] |  |
Customer Arbitration Against the Company's Brokerage Subsidiary | 79.5 |
Attorneys' Fees and Costs [Member] |  |
Loss Contingencies [Line Items] |  |
Customer Arbitration Against the Company's Brokerage Subsidiary | $ 26.5 |

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