INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Schedule of Investment in Real Estate Securities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Treasury
Debt Securities, Available-for-sale [Line Items]
Purchases, face	$ 0.0	$ 1,552.0
Purchases, purchase price	0.0	1,545.3
Sales, face	862.0	690.0
Sales, amortized cost	858.0	687.2
Sales, sale price	849.8	686.7
Sales, gain (loss) on sale	(8.2)	(0.5)
Agency
Debt Securities, Available-for-sale [Line Items]
Purchases, face	11,006.7	7,135.2
Purchases, purchase price	11,121.6	7,367.8
Sales, face	9,485.0	7,310.7
Sales, amortized cost	9,590.6	7,536.6
Sales, sale price	9,569.2	7,539.6
Sales, gain (loss) on sale	(21.4)	3.0
Non-Agency
Debt Securities, Available-for-sale [Line Items]
Purchases, face	9,194.8	7,606.5
Purchases, purchase price	3,854.4	3,053.0
Sales, face	115.0	235.1
Sales, amortized cost	87.7	164.3
Sales, sale price	86.4	182.4
Sales, gain (loss) on sale	$ (1.3)	$ 18.0

The face value of securities purchased during the period.

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The face value of securities sold during the period.

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

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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