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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Details) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended
Apr. 30, 2018
Sep. 30, 2018
Fund II and Mervyns II    
Variable Interest Entity [Line Items]    
Operating Partnership Share of Capital   28.33%
Capital Called   $ 347.1
Unfunded Commitment   $ 0.0
Equity interest held by Operating Partnership   28.33%
Preferred Return   8.00%
Total Distributions   $ 146.6
Fund III    
Variable Interest Entity [Line Items]    
Operating Partnership Share of Capital   24.54%
Capital Called   $ 423.9
Unfunded Commitment   $ 26.1
Equity interest held by Operating Partnership   24.54%
Preferred Return   6.00%
Total Distributions   $ 551.9
Fund IV    
Variable Interest Entity [Line Items]    
Operating Partnership Share of Capital   23.12%
Capital Called   $ 420.8
Unfunded Commitment   $ 109.2
Equity interest held by Operating Partnership   23.12%
Preferred Return   6.00%
Total Distributions   $ 147.4
Fund V    
Variable Interest Entity [Line Items]    
Operating Partnership Share of Capital   20.10%
Capital Called   $ 85.1
Unfunded Commitment   $ 434.9
Equity interest held by Operating Partnership   20.10%
Preferred Return   6.00%
Total Distributions   $ 0.0
Fund II    
Variable Interest Entity [Line Items]    
Total Distributions $ 15.0  
Operating Partnership, as General Partner or Managing Member    
Variable Interest Entity [Line Items]    
Total Distributions $ 4.3