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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2019
USD ($)
Mar. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
segment
Partnership
fund
Dec. 31, 2018
security
Number of reportable segments | segment   1 3  
Number of bonds in an unrealized loss position | security       0
ASU 2017-05        
Cumulative Effect on Retained Earnings, Net of Tax     $ 9.2  
ASU 2016-02        
Impairment of equity investments   $ 0.4    
Forecast | ASU 2017-08        
Cumulative Effect on Retained Earnings, Net of Tax $ 0.3      
Guaranteed Funds        
Number of unconsolidated Guaranteed Funds | fund     2  
Consolidated Funds and Ventures        
Number of partnerships | Partnership     4  
Number of partnerships owning affordable housing properties | Partnership     3  
Consolidated Funds and Ventures | Guaranteed Funds        
Number of LIHTC funds for which general partner interests were sold with certain indemnifications to purchaser | fund     11  
Consolidated Funds and Ventures | Maximum | Guaranteed Funds        
Ownership percentage     1.00%  
Consolidated Funds and Ventures | Minimum | Guaranteed Funds        
Ownership percentage     0.01%