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Unconsolidated Investments - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
fund
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
fund
joint_venture
property
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]          
Payments to joint venture     $ 67.6    
Proceeds from equity method investments     150.3    
Income from unconsolidated investments $ 14.9 $ 84.0 45.0 $ 131.6  
Income (loss) from unconsolidated investments, residential     16.4    
Income (loss) from unconsolidated investments, other     4.6    
Fair value of unconsolidated investments 1,114.6   1,114.6   $ 1,099.3
Income from unconsolidated investments - impairment (6.7) $ 0.0 $ (6.7) $ (10.3)  
Number of joint ventures with unfulfilled capital commitments | joint_venture     6    
Equity Method Investments [Member]          
Schedule of Equity Method Investments [Line Items]          
Unfunded capital commitments 98.6   $ 98.6    
Equity Method Investments Closed-End Funds [Member]          
Schedule of Equity Method Investments [Line Items]          
Unfunded capital commitments $ 78.7   $ 78.7    
Number of closed-end funds | fund 3   3    
Vintage Housing Holdings [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 139.8   $ 139.8   145.2
Minimum [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 5.00%   5.00%    
Maximum [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 50.00%   50.00%    
Ireland [Member] | Joint Venture [Member]          
Schedule of Equity Method Investments [Line Items]          
Number of properties generating distributions | property     2    
Recurring [Member]          
Schedule of Equity Method Investments [Line Items]          
Fair value of unconsolidated investments $ 1,114.6   $ 1,114.6   $ 1,099.3