INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Schedule of Investment in Real Estate Securities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Treasury
Schedule of Available-for-sale Securities [Line Items]
Purchases, face	$ 1,552.0
Purchases, purchase price	1,545.3
Sales, face	690.0
Sales, amortized cost	687.2
Sales, sale price	686.7
Sales, gain (loss) on sale	(0.5)
Agency
Schedule of Available-for-sale Securities [Line Items]
Purchases, face	7,135.2	$ 7,163.3
Purchases, purchase price	7,367.8	7,467.6
Sales, face	7,310.7	6,466.1
Sales, amortized cost	7,536.6	6,749.4
Sales, sale price	7,539.6	6,740.0
Sales, gain (loss) on sale	3.0	(9.4)
Non-Agency
Schedule of Available-for-sale Securities [Line Items]
Purchases, face	7,606.5	5,431.6
Purchases, purchase price	3,053.0	2,746.3
Sales, face	235.1	332.5
Sales, amortized cost	164.3	284.7
Sales, sale price	182.4	266.6
Sales, gain (loss) on sale	$ 18.0	$ (18.1)

The face value of securities purchased during the period.

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- Definition

The face value of securities sold during the period.

+ References

No definition available.

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- Definition

Available-for-sale Debt Securities, Amortized Cost Basis of Securities Sold

+ References

No definition available.

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- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

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- Definition

The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Line items represent financial 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.

+ References

No definition available.

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