FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Residential mortgage loans, held-for-sale, at fair value
Schedule of Equity Method Investments [Line Items]
Assets, fair value adjustment	$ (8.3)	$ 38.2
Real Estate Owned
Schedule of Equity Method Investments [Line Items]
Assets, fair value adjustment	(0.7)	(4.3)
Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	102.3	130.6
Nonrecurring | Residential Mortgage Loans, Held-for-Sale
Schedule of Equity Method Investments [Line Items]
Assets, fair value	91.8	115.5
Nonrecurring | Real Estate Acquired in Satisfaction of Debt
Schedule of Equity Method Investments [Line Items]
Assets, fair value	$ 10.5	$ 15.1
Maturity Greater than 30 Days
Schedule of Equity Method Investments [Line Items]
Days delinquent (in days)	30 days
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%
Mortgage Servicing Rights Financing Receivable | LIBOR
Schedule of Equity Method Investments [Line Items]
Variable interest rate spread	2.10%
MSRs | Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate	8.30%	7.40%
MSRs | Weighted Average | Excess MSR Joint Ventures
Schedule of Equity Method Investments [Line Items]
Discount rate	8.30%	7.80%
MSRs | Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate	7.60%	6.90%
MSRs | Minimum | Excess MSR Joint Ventures
Schedule of Equity Method Investments [Line Items]
Discount rate	8.00%	7.50%
MSRs | Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate	9.80%	12.50%
MSRs | Maximum | Excess MSR Joint Ventures
Schedule of Equity Method Investments [Line Items]
Discount rate	8.50%	8.00%