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v3.25.4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2025 USD ($) segment | Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($)
Summary of Significant Accounting Policies |  |  |
Number of reportable segments | segment | 5 | 6 |
Revenues | $ 4,714.2 | $ 4,094.5 | $ 3,773.5
Options to renew | true |  |
Option to terminate period (in years) | 1 year |  |
Minimum |  |  |
Summary of Significant Accounting Policies |  |  |
Useful life (in years) | 3 years |  |
Renewal term (in years) | 1 year |  |
Maximum |  |  |
Summary of Significant Accounting Policies |  |  |
Useful life (in years) | 7 years |  |
Renewal term (in years) | 5 years |  |
Option to terminate period (in years) | 1 year |  |
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Major Customer |  |  |
Summary of Significant Accounting Policies |  |  |
Concentration risk (as a percent) | 10.00% | 10.00% | 10.00%
Revenues | $ 480.0 | $ 403.1 | $ 389.4
Market-Maker Transaction Benchmark | Customer Concentration Risk | Three Largest Clearing Members |  |  |
Summary of Significant Accounting Policies |  |  |
Concentration risk (as a percent) | 71.00% |  |

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