REAL ESTATE AND OTHER SECURITIES - Schedule of Investment in Real Estate Securities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Agency
Purchases
Face	$ 16,479.3	$ 5,907.2
Purchase price	16,314.6	6,098.8
Sales
Face	16,516.0	7,830.8
Amortized cost	16,759.7	8,135.6
Sale price	15,026.3	8,074.3
Gain (loss) on sale	(1,733.4)	(61.3)
Non-Agency
Purchases
Face	5,018.1	2,999.3
Purchase price	256.5	174.3
Sales
Face	15.3	1,686.9
Amortized cost	13.6	193.2
Sale price	12.0	164.7
Gain (loss) on sale	$ (1.6)	$ (28.5)

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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).

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