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GOODWILL AND INTANGIBLE ASSETS, NET - Goodwill by segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill |  |  |
Balance at beginning of the year | $ 2,895.1 | $ 2,682.1 |
Adjustments | (0.9) |  |
Additions | 134.0 | 201.2 |
Impairment |  |  | $ (10.5)
Changes in foreign currency exchange rates | (2.8) | 11.8 |
Balance at end of the year | 3,025.4 | 2,895.1 | 2,682.1
Options |  |  |
Goodwill |  |  |
Balance at beginning of the year | 305.8 | 239.4 |
Additions |  | 66.4 |
Balance at end of the year | 305.8 | 305.8 | 239.4
North American Equities |  |  |
Goodwill |  |  |
Balance at beginning of the year | 1,877.3 | 1,740.4 |
Adjustments | (0.5) |  |
Additions |  | 134.8 |
Changes in foreign currency exchange rates | 0.1 | 2.1 |
Balance at end of the year | 1,876.9 | 1,877.3 | 1,740.4
Europe and Asia Pacific |  |  |
Goodwill |  |  |
Balance at beginning of the year | 444.8 | 435.1 |
Adjustments | (0.4) |  |
Additions | 134.0 |  |
Changes in foreign currency exchange rates | (2.9) | 9.7 |
Balance at end of the year | 575.5 | 444.8 | 435.1
Global FX |  |  |
Goodwill |  |  |
Balance at beginning of the year | 267.2 | 267.2 |
Balance at end of the year | 267.2 | $ 267.2 | $ 267.2
Futures |  |  |
Goodwill |  |  |
Balance at end of the year | $ 0.0 |  |

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