FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)
Fair Value, Measurements, Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	$ 348.1	$ 348.1
Residential Mortgage Loans, Held-for-Sale \| Fair Value, Measurements, Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	324.4	324.4
Real Estate Acquired in Satisfaction of Debt \| Fair Value, Measurements, Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	23.7	23.7
Residential mortgage loans, held-for-sale, at fair value
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	30.9	46.5
Real Estate Owned
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	$ 1.7	$ 4.9
Weighted Average
Schedule of Equity Method Investments [Line Items]
Broker price discount	14.00%	14.00%
Minimum
Schedule of Equity Method Investments [Line Items]
Broker price discount	10.00%	10.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Broker price discount	25.00%	25.00%
Excess MSRs Investees \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate		7.80%
Excess MSRs Investees \| Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate		7.50%
Excess MSRs Investees \| Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate		8.00%
Mortgage Servicing Rights Financing Receivable \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate		9.00%
MSRs \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate		7.20%
MSRs \| Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate		6.90%
MSRs \| Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate		12.50%
MSRs \| Excess MSRs Investees
Schedule of Equity Method Investments [Line Items]
Discount rate		7.80%
London Interbank Offered Rate (LIBOR) \| Mortgage Servicing Rights Financing Receivable
Schedule of Equity Method Investments [Line Items]
Variable interest rate spread		2.10%

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