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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net Cash Provided by (Used in) Financing Activities | $ 69,908.7 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | $ 72,369.5 | $ 49,786.7 | $ (2,199.1)
Previously Reported |  |  |
Net Cash Provided by (Used in) Financing Activities |  | (2,458.2) | (2,340.8)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  | 81.9 | 179.4
Revision of Prior Period, Adjustment |  |  |
Net Cash Provided by (Used in) Financing Activities |  | 49,704.8 | (2,378.5)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  | 49,704.8 | (2,378.5)
Restated Balance |  |  |
Net Cash Provided by (Used in) Financing Activities |  | 47,246.6 | (4,719.3)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  | $ 49,786.7 | $ (2,199.1)
Clearing and Transaction Fees [Member] | Clearing and Transaction Fees [Member] | Clearing and Transaction Fees [Member] |  |  |
Concentration of revenue | 10.00% | 10.00% | 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 | 34.00% | 35.00% | 37.00%
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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