Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Call Rights (Details) - Residential Mortgage Loans $ in Millions	1 Months Ended
	Jul. 31, 2017 USD ($) trust	Jun. 30, 2017 USD ($) trust	May 31, 2017 USD ($) trust	Apr. 30, 2017 USD ($) trust	Feb. 28, 2017 USD ($) trust	Sep. 30, 2017 USD ($) trust	Mar. 31, 2017 USD ($) trust	Jan. 31, 2017 USD ($) trust
Investment [Line Items]
Number of Trusts Called \| trust	22		15		31	21	12	2
Call Right, Batch 1
Investment [Line Items]
Number of Trusts Called \| trust		20		0
Call Right, Batch 2
Investment [Line Items]
Number of Trusts Called \| trust		3		14
Securities Owned Prior
Investment [Line Items]
Face Amount	$ 19.9		$ 26.4		$ 60.9	$ 120.6	$ 0.0	$ 49.3
Amortized Cost Basis	15.7		16.9		40.1	95.1	0.0	43.6
Securities Owned Prior \| Call Right, Batch 1
Investment [Line Items]
Face Amount		$ 1.0		$ 0.0
Amortized Cost Basis		0.5		0.0
Securities Owned Prior \| Call Right, Batch 2
Investment [Line Items]
Face Amount		28.2		9.8
Amortized Cost Basis		17.3		6.3
Assets Acquired
Investment [Line Items]
Unpaid Principal Balance	358.5		420.5		882.0	583.7	222.4	98.8
Loan Price	360.5		424.4		895.5	593.2	228.8	96.7
REO & Other Price	1.7		3.7		10.1	$ 5.3	0.4	$ 7.5
Assets Acquired \| Call Right, Batch 1
Investment [Line Items]
Unpaid Principal Balance		534.8		0.0
Loan Price		549.8		0.0
REO & Other Price		0.8		0.0
Assets Acquired \| Call Right, Batch 2
Investment [Line Items]
Unpaid Principal Balance		101.7		376.9
Loan Price		106.6		378.8
REO & Other Price		1.9		5.9
Loans Sold
Investment [Line Items]
Unpaid Principal Balance	339.3		716.0		773.8
Gain (Loss)	2.7		5.7		2.1
Loans Sold \| Call Right, Batch 1
Investment [Line Items]
Unpaid Principal Balance		497.6		668.0
Gain (Loss)		10.3		10.3
Previously acquired UPB		31.1
Retained Bonds
Investment [Line Items]
Basis	25.7		68.4		81.9
Retained Bonds \| Call Right, Batch 1
Investment [Line Items]
Basis		58.4		76.1
Retained Assets
Investment [Line Items]
Unpaid Principal Balance	18.3		47.6		105.9		27.7
Loan Price	18.6		40.5		90.1		25.7
REO & Other Price	$ 1.7		$ 3.7		$ 10.8		$ 0.4
Retained Assets \| Call Right, Batch 1
Investment [Line Items]
Unpaid Principal Balance		34.9		0.0
Loan Price		40.4		0.0
REO & Other Price		$ 0.8		0.0
Retained Assets \| Call Right, Batch 2
Investment [Line Items]
Unpaid Principal Balance				62.5
Loan Price				55.7
REO & Other Price				$ 5.9