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Unconsolidated Investments - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
joint_venture
property
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]          
Payments to joint venture     $ 229.9    
Proceeds from equity method investments     61.9    
Income from unconsolidated investments $ 5.9 $ 10.9 47.6 $ 36.9  
Income (loss) from unconsolidated investments, other     1.7    
Fair value of unconsolidated investments 835.8   835.8   $ 662.2
Non-cash contribution to acquire interest in joint venture     $ 125.5    
Number of joint ventures with unfulfilled capital commitments | joint_venture     3    
Equity Method Investments [Member]          
Schedule of Equity Method Investments [Line Items]          
Fair value of unconsolidated investments 835.8   $ 835.8   662.2
Unfunded capital commitments 106.7   106.7    
Vintage Housing Holdings [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 110.5   $ 110.5   101.5
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%    
Western U.S. [Member] | Office Building [Member] | Joint Venture [Member]          
Schedule of Equity Method Investments [Line Items]          
Number of properties acquired | property     2    
Recurring [Member]          
Schedule of Equity Method Investments [Line Items]          
Fair value of unconsolidated investments $ 835.8   $ 835.8   $ 662.2