Legal Proceeding (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
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