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
6 Months Ended
May 21, 2019
Apr. 19, 2019
Apr. 02, 2019
Mar. 29, 2019
Feb. 28, 2019
Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]            
Unpaid Principal Balance           $ 74,500.0
Purchase Price $ 218.0 $ 230.5 $ 84.4 $ 126.9 $ 116.7 841.6
MSRs            
Schedule of Equity Method Investments [Line Items]            
Unpaid Principal Balance   $ 18,500.0   $ 10,000.0 $ 9,500.0  
Various Acquisition            
Schedule of Equity Method Investments [Line Items]            
Purchase Price           65.1
Various Acquisition | MSRs            
Schedule of Equity Method Investments [Line Items]            
Unpaid Principal Balance           $ 4,600.0