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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

X

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Amount classified as goodwill attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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