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ACQUISITIONS (Details) $ in Millions, € in Billions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Aug. 04, 2020 USD ($) | Jul. 01, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jul. 01, 2020 EUR (€) | Jan. 31, 2016
Acquisitions |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 134.0 | $ 201.2 |  |  |
Contingent consideration liabilities |  | $ 32.7 |  |  | 70.5 | 32.7 |  |  |
Bargain purchase gain |  |  |  |  |  | 32.6 |  |  |
Compensation and benefits |  |  |  |  | 288.5 | 224.9 | $ 199.0 |  |
Acquisition-related costs |  |  |  |  | 15.6 | 45.2 | 48.5 |  |
Professional fees |  |  |  |  | 83.7 | 60.6 | 68.3 |  |
Impairment of goodwill |  |  |  |  |  |  | 10.5 |  |
Vest Financial Group Inc. |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Noncontrolling interest percentage |  |  |  |  |  |  |  |  | 40.00%
Acquisitions |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  | 2.0 |  |
Compensation and benefits |  |  |  |  |  |  | 19.3 |  |
Acquisition-related costs |  |  |  |  | 15.6 | 45.3 | 48.5 |  |
Professional fees |  |  |  |  | 15.0 | 22.1 | 3.9 |  |
Impairment of investment |  |  |  |  | $ 0.6 | 15.1 |  |  |
Impairment of goodwill |  |  |  |  |  |  | 10.5 |  |
Impairment facilities charges |  |  |  |  |  | 8.1 | 6.1 |  |
Lease termination fees |  |  |  |  |  |  | 2.2 |  |
Impairment of capitalized data processing software |  |  |  |  |  |  | $ 4.5 |  |
EuroCCP |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 32.3 |  |  |  |  |
Working capital |  |  |  | $ 56.0 |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  | 80.00% |  |  |  | 80.00% |
Bargain purchase gain |  |  |  | $ 32.6 |  |  |  |  |
EuroCCP | Credit Facility |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Debt instrument face amount | € |  |  |  |  |  |  |  | € 1.5 |
Hanweck, FT Options, Trade Alert, and MATCHNow |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 100.7 |  |  |  |  |  |
Intangible assets |  |  | 59.0 |  |  |  |  |  |
Working capital |  |  | 2.2 |  |  |  |  |  |
Contingent consideration liabilities |  |  | $ 32.7 |  |  |  |  |  |
BIDS Holdings |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Goodwill |  | 100.0 |  |  |  |  |  |  |
Intangible assets |  | 156.4 |  |  |  | 156.4 |  |  |
Working capital |  | $ 23.3 |  |  |  | $ 23.3 |  |  |
Chi-X Asia Pacific |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Number of key capital markets | item | 2 |  |  |  |  |  |  |  |
Goodwill | $ 133.6 |  |  |  |  |  |  |  |
Intangible assets | 73.8 |  |  |  |  |  |  |  |
Working capital | 25.7 |  |  |  |  |  |  |  |
Contingent consideration liabilities | $ 49.6 |  |  |  |  |  |  |  |

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