FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Alternative investment	$ 70.2
Secured Notes and Bonds Payable | Sculptor
Schedule of Equity Method Investments [Line Items]
Unsecured senior notes, net of issuance costs	218.2
Real Estate Owned
Schedule of Equity Method Investments [Line Items]
Assets, fair value adjustment	(1.7)	$ (0.7)
Residential mortgage loans, held-for-sale, at fair value
Schedule of Equity Method Investments [Line Items]
Assets, fair value adjustment	1.9	(8.3)
Fair Value, Measurements, Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	84.8	102.3
Fair Value, Measurements, Nonrecurring | Residential Mortgage Loans, Held-for-Sale
Schedule of Equity Method Investments [Line Items]
Assets, fair value	78.9	91.8
Fair Value, Measurements, Nonrecurring | Real Estate Owned
Schedule of Equity Method Investments [Line Items]
Assets, fair value	$ 5.9	$ 10.5
Maturity Greater than 30 Days
Schedule of Equity Method Investments [Line Items]
Days delinquent (in days)	30 days
Weighted Average
Schedule of Equity Method Investments [Line Items]
Broker price discount	22.00%
Minimum
Schedule of Equity Method Investments [Line Items]
Recapture rate, term (in months)	3 months
Broker price discount	10.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Recapture rate, term (in months)	6 months
Broker price discount	25.00%
Excess MSRs | Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate	8.80%	8.30%
Excess MSRs | Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate	8.50%	8.00%
Excess MSRs | Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate	9.00%	8.50%
MSRs | Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate	8.50%	8.30%
MSRs | Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate	7.90%	7.60%
MSRs | Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate	10.80%	9.80%
Secured Overnight Financing Rate | MSRs And MSR Financing Receivables
Schedule of Equity Method Investments [Line Items]
Variable interest rate spread	4.10%