Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENT - Narrative (Details)

v3.19.1
FAIR VALUE MEASUREMENT - Narrative (Details)
$ in Millions
3 Months Ended
Sep. 20, 2018
Mar. 31, 2019
USD ($)
Jul. 03, 2018
USD ($)
earnout_payment
Schedule of Equity Method Investments [Line Items]      
Asset fair value adjustment   $ 5.8  
Fair Value, Measurements, Nonrecurring      
Schedule of Equity Method Investments [Line Items]      
Assets, fair value   $ 900.0  
Minimum      
Schedule of Equity Method Investments [Line Items]      
Broker price discount   10.00%  
Maximum      
Schedule of Equity Method Investments [Line Items]      
Broker price discount   25.00%  
Residential Mortgage Loans | Fair Value, Measurements, Nonrecurring      
Schedule of Equity Method Investments [Line Items]      
Assets, fair value   $ 838.4  
Real Estate Acquired in Satisfaction of Debt | Fair Value, Measurements, Nonrecurring      
Schedule of Equity Method Investments [Line Items]      
Assets, fair value   70.2  
Loans Held-for-sale and Held-for-investment      
Schedule of Equity Method Investments [Line Items]      
Asset fair value adjustment   6.5  
Real Estate Owned      
Schedule of Equity Method Investments [Line Items]      
Asset fair value adjustment   $ 0.7  
Mortgage Servicing Rights Financing Receivable      
Schedule of Equity Method Investments [Line Items]      
Discount rate   9.70%  
MSRs      
Schedule of Equity Method Investments [Line Items]      
Discount rate   8.10%  
MSRs | Excess MSRs Investees      
Schedule of Equity Method Investments [Line Items]      
Weighted average discount rate, used to value investments in excess MSRs   8.30%  
London Interbank Offered Rate (LIBOR) | Mortgage Servicing Rights Financing Receivable      
Schedule of Equity Method Investments [Line Items]      
Variable interest rate spread   0.90%  
Shellpoint Acquisition      
Schedule of Equity Method Investments [Line Items]      
Cash earnout payments | earnout_payment     3
Contingent consideration     $ 60.0
Contingent consideration, discount rate 8.00%    
Shellpoint Acquisition | Maximum      
Schedule of Equity Method Investments [Line Items]      
Contingent consideration     $ 60.0