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
9 Months Ended
Sep. 28, 2018
Aug. 31, 2018
Jun. 28, 2018
Jun. 04, 2018
Jun. 01, 2018
May 31, 2018
May 25, 2018
May 01, 2018
Mar. 28, 2018
Feb. 28, 2018
Jan. 17, 2018
Jan. 16, 2018
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]                          
Unpaid Principal Balance                         $ 84,100.0
Payments to acquire MSRs   $ 220.5 $ 66.5 $ 19.3 $ 6.1 $ 79.9 $ 26.3 $ 46.8 $ 96.6 $ 33.5     952.1
MSRs                          
Schedule of Equity Method Investments [Line Items]                          
Unpaid Principal Balance   $ 18,500.0 $ 4,700.0 $ 2,100.0 $ 500.0 $ 6,100.0 $ 2,100.0 $ 4,600.0 $ 8,100.0 $ 3,300.0      
Batch 1                          
Schedule of Equity Method Investments [Line Items]                          
Payments to acquire MSRs $ 13.6                     $ 101.5  
Batch 1 | MSRs                          
Schedule of Equity Method Investments [Line Items]                          
Unpaid Principal Balance 1,100.0                     $ 11,500.0  
Batch 2                          
Schedule of Equity Method Investments [Line Items]                          
Payments to acquire MSRs 126.4                   $ 81.0    
Batch 2 | MSRs                          
Schedule of Equity Method Investments [Line Items]                          
Unpaid Principal Balance $ 10,100.0                   $ 7,800.0    
Various Acquisition                          
Schedule of Equity Method Investments [Line Items]                          
Payments to acquire MSRs                         34.1
Various Acquisition | MSRs                          
Schedule of Equity Method Investments [Line Items]                          
Unpaid Principal Balance                         $ 3,600.0