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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Beginning balance January 1 | $ 3,187,169 | $ 1,759,040
Ending balance December 31 | 3,208,333 | 3,187,169
Goodwill, Acquired During Period | 13,942 | 1,384,027
Goodwill, Foreign Currency Translation Gain (Loss) | 7,222 | 44,102
Disposal Group, Including Discontinued Operation, Goodwill, Current | 26,100 |
Goodwill |  |
Goodwill [Roll Forward] |  |
Out-of-Period Adjustment |  | 33,900
EES |  |
Goodwill [Roll Forward] |  |
Beginning balance January 1 | 853,456 | 573,447
Ending balance December 31 | 860,958 | 853,456
Goodwill, Acquired During Period | 1,124 | 264,538
Goodwill, Foreign Currency Translation Gain (Loss) | 6,378 | 15,471
Goodwill, Period Increase (Decrease) | 20,200 |
UBS |  |
Goodwill [Roll Forward] |  |
Beginning balance January 1 | 1,218,213 | 949,882
Ending balance December 31 | 1,225,663 | 1,218,213
Goodwill, Acquired During Period | 4,215 | 250,553
Goodwill, Foreign Currency Translation Gain (Loss) | 3,235 | 17,778
Goodwill, Period Increase (Decrease) | 11,700 |
CSS |  |
Goodwill [Roll Forward] |  |
Beginning balance January 1 | 1,115,500 | 235,711
Ending balance December 31 | 1,121,712 | 1,115,500
Goodwill, Acquired During Period | 8,603 | 868,936
Goodwill, Foreign Currency Translation Gain (Loss) | (2,391) | $ 10,853
Goodwill, Period Increase (Decrease) | $ 2,000 |

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