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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Schedule of Residential Mortgage Loans Outstanding by Loan Type, Excluding REO (Footnote) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2013
Dec. 31, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]      
Threshold period past due   30 days  
Net unamortized discounts and premiums   $ 12.0  
Residential Mortgage Loan [Member]      
Mortgage Loans on Real Estate [Line Items]      
Residential mortgage loans, federal income tax basis   $ 1,204.2 $ 1,159.1
Reverse Mortgage Loans [Member]      
Mortgage Loans on Real Estate [Line Items]      
Interest in reverse mortgage loans 70.00% 70.00%  
Total unpaid principal balance   $ 0.4 $ 0.3
Percentage of loans that have reached a termination event   71.00% 77.00%
Non-Performing Loans [Member] | Ginnie Mae EBO [Member]      
Mortgage Loans on Real Estate [Line Items]      
UPB of Underlying Mortgages   $ 246.3  
Maximum [Member] | Performing Loans [Member]      
Mortgage Loans on Real Estate [Line Items]      
Threshold period past due   30 days