REAL ESTATE AND OTHER SECURITIES - Schedule of Investment in Real Estate Securities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Agency
Purchases
Face	$ 2,162.4	$ 998.2
Purchase price	2,154.4	1,004.5
Sales
Face	1,462.4	0.0
Amortized cost	1,442.8	0.0
Sale price	1,395.9	0.0
Gain (loss) on sale	(46.9)	0.0
Non-Agency
Purchases
Face	25.2	2,210.0
Purchase price	2.4	115.7
Sales
Face	0.0	0.0
Amortized cost	0.0	1.6
Sale price	0.0	0.0
Gain (loss) on sale	$ 0.0	$ (1.6)

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