Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands		7 Months Ended	8 Months Ended	12 Months Ended
ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands	Sep. 04, 2019	Dec. 31, 2019	Sep. 03, 2019	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Mergers and acquisitions related costs		$ 14,784	$ 2,511	$ 3,093	$ 1,526
Debt issuance costs, gross	$ 6,100
Business acquisition, transaction costs	23,000
Business combination, separately recognized transactions, additional disclosures, acquisition cost expensed	21,500
Business combination, contingent consideration, liability	2,800
Goodwill				455,206	455,206
Advanced Plan Administration
Business Acquisition [Line Items]
Goodwill				88,900
Supplemental Benefits Administration
Business Acquisition [Line Items]
Goodwill				190,200	190,100
Value Based Payment Assurance
Business Acquisition [Line Items]
Goodwill				138,200
Advisory Services
Business Acquisition [Line Items]
Goodwill				$ 37,900	38,000
Trade names
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				19 years 8 months 12 days
Customer relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				11 years
Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				10 years
Cannes
Business Acquisition [Line Items]
Total consideration	702,063
Mergers and acquisitions related costs	14,100
Share-based payment arrangement, nonvested award, cost not yet recognized, amount	4,100
Write off of deferred debt issuance cost	3,100
Goodwill	455,206
Business combination, recognized identifiable assets acquired and liabilities assumed, net	246,900
Cannes \| Revision of Prior Period, Adjustment
Business Acquisition [Line Items]
Total consideration	0
Goodwill	200
Cannes \| Previously Reported
Business Acquisition [Line Items]
Total consideration	702,063
Goodwill	455,006				$ 455,200
Business combination, recognized identifiable assets acquired and liabilities assumed, net	247,100
Cannes \| Tradenames, Customer Relationships and Technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 264,100