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Unconsolidated Investments - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
joint_venture
property
fund
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]      
Payments to joint venture $ 45.3    
Proceeds from equity method investments 95.0    
Income from unconsolidated investments 10.9 $ 41.7  
Income (loss) from unconsolidated investments, residential 16.5    
Income (loss) from unconsolidated investments, other 22.7    
Fair value of unconsolidated investments $ 1,081.6   $ 1,107.4
Number of joint ventures with unfulfilled capital commitments | joint_venture 5    
Equity Method Investments [Member]      
Schedule of Equity Method Investments [Line Items]      
Fair value of unconsolidated investments $ 1,081.6   1,107.4
Unfunded capital commitments 97.1    
Equity Method Investments, Closed-End Funds      
Schedule of Equity Method Investments [Line Items]      
Unfunded capital commitments $ 80.1    
Equity Method Investments, Number Of Closed-End Funds | fund 3    
Vintage Housing Holdings [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 154.9   142.8
Minimum [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 5.00%    
Maximum [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 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 $ 1,081.6   $ 1,107.4