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Investments in Unconsolidated Ventures - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
loan
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
loan
Investment [Line Items]          
Impairment loss   $ 39.6     $ 48.4
Number of impaired loans | loan   3     3
Minimum          
Investment [Line Items]          
Investments fair value option, ownership percentage   0.10%     0.10%
Maximum          
Investment [Line Items]          
Investments fair value option, ownership percentage   22.00%     22.00%
Investments in unconsolidated ventures - PE Investments          
Investment [Line Items]          
Sale of portion of PE Investments       $ 48.9  
Loss recognized on sale PE Investments       0.7  
Proceeds related to sale of PE Investments   $ 38.4 $ 44.6 $ 42.3 $ 139.8
Loans and Equity Partnership Interest, Legacy, Non-strategic Portfolio          
Investment [Line Items]          
Impairment loss   $ 16.1      
Number of impaired loans | loan   2     2
Equity Participation Interest in Joint Venture, Core Portfolio          
Investment [Line Items]          
Impairment loss   $ 17.6      
Commercial Mortgage, Regional Mall Loans | Southeast Regional Mall          
Investment [Line Items]          
Impairment loss   $ 5.9     $ 14.7
Number of impaired loans | loan   1     1
Interest in joint venture (as a percentage)   50.00%     50.00%
Forecast | Investments in unconsolidated ventures - PE Investments          
Investment [Line Items]          
Proceeds related to sale of PE Investments $ 1.9