Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)
Fund II and Mervyns II
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Operating Partnership Share of Capital		40.00%
Capital Called	$ 18.5	$ 385.3
Unfunded Commitment	0.0	$ 0.0
Equity interest held by Operating Partnership		40.00%
Preferred Return		8.00%
Total Distributions		$ 172.1
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	$ 1.9
Equity interest held by Operating Partnership		24.54%
Preferred Return		6.00%
Total Distributions		$ 601.5
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	$ 41.9
Equity interest held by Operating Partnership		23.12%
Preferred Return		6.00%
Total Distributions		$ 212.4
Fund V
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Operating Partnership Share of Capital		20.10%
Capital Called		$ 347.9
Unfunded Commitment	$ 172.1	$ 172.1
Equity interest held by Operating Partnership		20.10%
Preferred Return		6.00%
Total Distributions		$ 71.7