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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 03, 2017
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 05, 2019
Dec. 12, 2018
Mar. 13, 2017
Oct. 18, 2016
Affiliated Entity                
RELATED PARTY TRANSACTIONS                
Investment in mutual fund     $ 0.8         $ 10.0
Fee earned on assets under management     0.75%          
Fund's cap expense     0.95%          
Affiliated Entity | Related Reserve IV LLC | B Participation Interest                
RELATED PARTY TRANSACTIONS                
Mortgage loan participation purchased by related party             $ 4.0  
Participating mortgage loan amount (up to)             $ 136.5  
Percentage of loans receivable with fixed rates of interest             17.00%  
Affiliated Entity | Related Reserve IV LLC | B Participation Interest | Participation Financing - Mortgage Loan Receivable                
RELATED PARTY TRANSACTIONS                
Interest expense, debt   $ 0.1 $ 0.2 $ 0.4        
Affiliated Entity | Brickell Heights Commercial LLC | First mortgage loan                
RELATED PARTY TRANSACTIONS                
Loans receivable from related party         $ 14.3 $ 6.4    
Related | Class A Common Stock                
RELATED PARTY TRANSACTIONS                
Related party purchases of shares from shareholders $ 80.0              
Consolidated Joint Venture | Brickell Heights Commercial LLC | First mortgage loan | Woodbury, New York                
RELATED PARTY TRANSACTIONS                
Interest income, related party     0.1          
Consolidated Joint Venture | Brickell Heights Commercial LLC | First mortgage loan | Bloomfield Heights, Michigan                
RELATED PARTY TRANSACTIONS                
Interest income, related party     $ 0.3          
Consolidated Joint Venture | Related Special Assets LLC | Brickell Heights Commercial LLC                
RELATED PARTY TRANSACTIONS                
Ownership Interest         0.70% 12.00%