GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price to goodwill				$ 213,328,000
Reallocation				0
Goodwill impairment				0	$ 0
Fully-amortized intangibles, amount removed during the period		$ 3,400,000
Real Assets Group
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price to goodwill				213,424,000
Reallocation				10,530,000
From Private Equity Group To Real Assets Group
Acquired Finite-Lived Intangible Assets [Line Items]
Reallocation				10,500,000
From Real Estate Group To Real Assets Group
Acquired Finite-Lived Intangible Assets [Line Items]
Reallocation				53,300,000
General, administrative and other expense
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 35,600,000		$ 17,300,000	68,700,000	$ 27,900,000
Infrastructure Debt Acquisition | Real Assets Group
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price to goodwill				213,400,000
Infrastructure Debt Acquisition | Management contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition and merger-related expense				$ 68,700,000
Estimated useful lives, intangible assets				5 years 2 months 12 days
Infrastructure Debt Acquisition | Client relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition and merger-related expense				$ 32,800,000
Estimated useful lives, intangible assets				8 years 4 months 24 days