Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENT - Narrative (Details)

v3.10.0.1
FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 20, 2018
Sep. 30, 2018
Jul. 03, 2018
Schedule of Equity Method Investments [Line Items]      
Asset fair value adjustment   $ 8.7  
Fair Value, Measurements, Nonrecurring      
Schedule of Equity Method Investments [Line Items]      
Assets, fair value   $ 300.0  
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   $ 227.1  
Real Estate Acquired in Satisfaction of Debt | Fair Value, Measurements, Nonrecurring      
Schedule of Equity Method Investments [Line Items]      
Assets, fair value   70.5  
Loans Held-for-sale and Held-for-investment      
Schedule of Equity Method Investments [Line Items]      
Asset fair value adjustment   8.9  
Real Estate Owned      
Schedule of Equity Method Investments [Line Items]      
Asset fair value adjustment   $ 0.2  
Mortgage Servicing Rights Financing Receivable      
Schedule of Equity Method Investments [Line Items]      
Discount rate   10.30%  
MSRs      
Schedule of Equity Method Investments [Line Items]      
Discount rate   8.70%  
MSRs | Excess MSRs Investees      
Schedule of Equity Method Investments [Line Items]      
Weighted average discount rate, used to value investments in excess MSRs   8.80%  
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]      
Contingent consideration     $ 60.0
Contingent consideration, discount rate 8.00%    
Shellpoint Acquisition | Maximum      
Schedule of Equity Method Investments [Line Items]      
Contingent consideration     $ 60.0