Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | segment	1
Fees paid to unaffiliated advisers | $	$ 54.7	$ 77.0	$ 115.5
Minimum
Summary Of Significant Accounting Policies [Line Items]
Weighted average of useful life	4 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Weighted average of useful life	16 years
Furniture and Office Equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of furniture and equipment	3 years
Furniture and Office Equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of furniture and equipment	7 years
Computer Equipment and Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of furniture and equipment	3 years