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, 2023 USD ($)
Fund II and Mervyns II
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Operating Partnership Share of Capital	61.67%
Capital Called	$ 559.4
Unfunded Commitment	$ 0.0
Equity interest held by Operating Partnership	61.67%
Preferred Return	8.00%
Total Distributions	$ 172.9
Fund III
Organization Consolidation And Presentation Of Financial Statements [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	$ 603.5
Fund IV
Organization Consolidation And Presentation Of Financial Statements [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	$ 221.4
Fund V
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Operating Partnership Share of Capital	20.10%
Capital Called	$ 387.0
Unfunded Commitment	$ 133.0
Equity interest held by Operating Partnership	20.10%
Preferred Return	6.00%
Total Distributions	$ 103.3