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Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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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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