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Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Clearing and Transaction Fees [Member] | Clearing and Transaction Fees [Member] | Clearing and Transaction Fees [Member]
Concentration of revenue	10.00%
Sales Revenue, Market Data and Information Services [Member] | Sales Revenue, Market Data and Information Services [Member] | Sales Revenue, Market Data and Information Services [Member]
Concentration of revenue	32.00%	33.00%	34.00%
Minimum [Member]
Estimated useful live of the assets minimum in years	2 years
Minimum [Member] | Software and software development costs
Estimated useful live of the assets minimum in years	2 years
Maximum [Member]
Estimated useful live of the assets minimum in years	20 years
Maximum [Member] | Software and software development costs
Estimated useful live of the assets minimum in years	4 years

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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-Topic 280
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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