Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Schedule of Mortgage Servicing Rights Acquired (Details)

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INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Schedule of Mortgage Servicing Rights Acquired (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 29, 2019
Feb. 28, 2019
Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Unpaid Principal Balance     $ 21,900.0
Payments to acquire MSRs     276.2
Batch 1      
Schedule of Equity Method Investments [Line Items]      
Payments to acquire MSRs   $ 116.7  
Batch 1 | MSRs      
Schedule of Equity Method Investments [Line Items]      
Unpaid Principal Balance   $ 9,500.0  
Batch 2      
Schedule of Equity Method Investments [Line Items]      
Payments to acquire MSRs $ 126.9    
Batch 2 | MSRs      
Schedule of Equity Method Investments [Line Items]      
Unpaid Principal Balance $ 10,000.0    
Various Acquisition      
Schedule of Equity Method Investments [Line Items]      
Payments to acquire MSRs     32.6
Various Acquisition | MSRs      
Schedule of Equity Method Investments [Line Items]      
Unpaid Principal Balance     $ 2,400.0