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REAL ESTATE SECURITIES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Decline in market value of real estate securities $ 78.2  
Unrealized gain (loss) on equity securities 1.3 $ 0.1
Other than temporary impairment losses included in consolidated statements of income $ (0.2) $ 0.0