GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Additional Information (Details)		2 Months Ended	12 Months Ended
	Nov. 01, 2024 USD ($) reporting_unit	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) reporting_unit	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reporting_unit	6		6
Goodwill impairment	$ 0
Goodwill		$ 2,331,461,000	$ 2,331,461,000	$ 865,180,000	$ 819,917,000
Intangible assets amortization period		9 years 1 month 6 days	9 years 1 month 6 days
2025		$ 75,100,000	$ 75,100,000
2026		73,100,000	73,100,000
2027		71,100,000	71,100,000
2028		64,600,000	64,600,000
2029		64,000,000.0	64,000,000.0
Thereafter		$ 266,100,000	$ 266,100,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period		3 years	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period		15 years	15 years
Client Lists and Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets			$ 32,700,000	23,800,000	21,700,000
Client lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period		9 years 2 months 12 days	9 years 2 months 12 days
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period		6 years 3 months 18 days	6 years 3 months 18 days
Other intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period		3 years	3 years
Other intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period		15 years	15 years
Marcum LLP
Finite-Lived Intangible Assets [Line Items]
Goodwill	1,445,070,000
Amortization of intangible assets		$ 8,900,000
Financial Services Practice Group | Marcum LLP
Finite-Lived Intangible Assets [Line Items]
Goodwill	1,433,500,000
Benefits and Insurance Services
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 330,229,000	$ 330,229,000	$ 316,324,000	$ 312,392,000
Benefits and Insurance Services | Marcum LLP
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 11,600,000