GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Other Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Gross carrying amount of other intangibles:
Acquisition intangibles, gross	$ 1,434,034	$ 612,847
Accumulated amortization	(381,541)	(290,779)
Total other intangibles, net	1,052,493	322,068
Customer related intangibles
Gross carrying amount of other intangibles:
Acquisition intangibles, gross	949,844	322,619
Accumulated amortization	(157,077)	(116,609)
Acquired software
Gross carrying amount of other intangibles:
Acquisition intangibles, gross	433,800	262,286
Accumulated amortization	(208,451)	(162,378)
Trade names
Gross carrying amount of other intangibles:
Acquisition intangibles, gross	45,353	22,905
Accumulated amortization	(13,064)	(9,366)
Leases acquired
Gross carrying amount of other intangibles:
Acquisition intangibles, gross	5,037	5,037
Accumulated amortization	$ (2,949)	$ (2,426)

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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