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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
Fund II and Mervyns II  
Variable Interest Entity [Line Items]  
Operating Partnership Share of Capital 28.33%
Capital Called $ 376.6
Unfunded Commitment $ 8.7
Equity interest held by Operating Partnership 28.33%
Preferred Return 8.00%
Total Distributions $ 169.8
Fund III  
Variable Interest Entity [Line Items]  
Operating Partnership Share of Capital 24.54%
Capital Called $ 448.1
Unfunded Commitment $ 1.9
Equity interest held by Operating Partnership 24.54%
Preferred Return 6.00%
Total Distributions $ 576.0
Fund IV  
Variable Interest Entity [Line Items]  
Operating Partnership Share of Capital 23.12%
Capital Called $ 488.1
Unfunded Commitment $ 41.9
Equity interest held by Operating Partnership 23.12%
Preferred Return 6.00%
Total Distributions $ 193.1
Fund V  
Variable Interest Entity [Line Items]  
Operating Partnership Share of Capital 20.10%
Capital Called $ 226.2
Unfunded Commitment $ 293.8
Equity interest held by Operating Partnership 20.10%
Preferred Return 6.00%
Total Distributions $ 42.8