INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2018	Jul. 23, 2017
Schedule of MSRs [Line Items]
Subservicer percent of UPB	38.50%
Reserve for non-recovery advances	$ 19.7
Ocwen
Schedule of MSRs [Line Items]
UPB of Underlying Mortgages			$ 86,800.0	$ 110,000.0
Mortgage Loans Subserviced
Schedule of MSRs [Line Items]
UPB of Underlying Mortgages	82,700.0	$ 51,100.0
Subservicing revenue	$ 94.2	$ 64.7
PHH Mortgage Corporation
Schedule of MSRs [Line Items]
Subservicer percent of UPB	22.20%
LoanCare
Schedule of MSRs [Line Items]
Subservicer percent of UPB	20.80%
Mr. Cooper
Schedule of MSRs [Line Items]
Subservicer percent of UPB	17.70%
Flagstar Bank
Schedule of MSRs [Line Items]
Subservicer percent of UPB	0.80%
Ocwen | New Residential Mortgage LLC | MSRs
Schedule of MSRs [Line Items]
Unpaid principal balance of underlying loans, transferred	$ 66,700.0