Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Call Rights (Details)

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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Call Rights (Details)
$ in Millions
1 Months Ended
Aug. 31, 2018
USD ($)
trust
May 31, 2018
USD ($)
trust
Jan. 31, 2018
USD ($)
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Sep. 30, 2018
USD ($)
trust
Jun. 30, 2018
USD ($)
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Apr. 30, 2018
USD ($)
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Mar. 31, 2018
USD ($)
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Investment [Line Items]              
Unpaid Principal Balance       $ 84,100.0      
Residential Mortgage Loans              
Investment [Line Items]              
Number of Trusts Called | trust 6 12   4 12 8 25
Previously acquired loans $ 78.3 $ 33.5          
Residential Mortgage Loans | Call Right, Batch 1              
Investment [Line Items]              
Number of Trusts Called | trust     0        
Residential Mortgage Loans | Call Right, Batch 2              
Investment [Line Items]              
Number of Trusts Called | trust     7        
Residential Mortgage Loans | Securities Owned Prior              
Investment [Line Items]              
Face Amount 9.6 6.7   $ 14.7 $ 32.3 $ 5.8 $ 85.9
Amortized Cost Basis 6.7 4.7   9.1 19.4 4.8 75.4
Residential Mortgage Loans | Securities Owned Prior | Call Right, Batch 1              
Investment [Line Items]              
Face Amount     $ 0.0        
Amortized Cost Basis     0.0        
Residential Mortgage Loans | Securities Owned Prior | Call Right, Batch 2              
Investment [Line Items]              
Face Amount     0.4        
Amortized Cost Basis     0.2        
Residential Mortgage Loans | Assets Acquired              
Investment [Line Items]              
Unpaid Principal Balance 145.5 475.6   104.8 409.0 218.8 458.8
Loan Price 142.8 473.5   105.2 400.6 222.3 461.4
REO & Other Price 0.9 3.2   $ 2.0 $ 3.6 $ 2.0 $ 4.1
Residential Mortgage Loans | Assets Acquired | Call Right, Batch 1              
Investment [Line Items]              
Unpaid Principal Balance     0.0        
Loan Price     0.0        
REO & Other Price     0.0        
Residential Mortgage Loans | Assets Acquired | Call Right, Batch 2              
Investment [Line Items]              
Unpaid Principal Balance     32.5        
Loan Price     32.8        
REO & Other Price     0.1        
Residential Mortgage Loans | Loans Sold              
Investment [Line Items]              
Unpaid Principal Balance 658.5 435.3          
Loans Sold, Gain (Loss) (12.4) (6.7)          
Residential Mortgage Loans | Loans Sold | Call Right, Batch 1              
Investment [Line Items]              
Unpaid Principal Balance     726.5        
Loans Sold, Gain (Loss)     (17.8)        
Residential Mortgage Loans | Retained Bonds              
Investment [Line Items]              
Restricted Bonds, Basis 535.8 52.9          
Residential Mortgage Loans | Retained Bonds | Call Right, Batch 1              
Investment [Line Items]              
Restricted Bonds, Basis     76.8        
Residential Mortgage Loans | Retained Assets              
Investment [Line Items]              
Unpaid Principal Balance 521.8 56.0          
Loan Price 499.1 46.8          
REO & Other Price $ 8.7 $ 4.6          
Residential Mortgage Loans | Retained Assets | Call Right, Batch 1              
Investment [Line Items]              
Unpaid Principal Balance     265.3        
Loan Price     239.0        
REO & Other Price     $ 14.4