Borrowings - CLO Borrowings (Details) € in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2023 EUR (€)	Dec. 31, 2022 USD ($)
CLO Term Loan Maturing November 2031
Debt Instrument [Line Items]
Borrowing Outstanding	$ 39.4	€ 36.1	$ 38.7
CLO Term Loan Maturing November 2031 \| Euribor
Debt Instrument [Line Items]
Interest Rate	5.55%	5.55%
CLO Term Loan June 2017 Maturing July 20, 2030
Debt Instrument [Line Items]
Borrowing Outstanding	$ 52.3		54.8
CLO Term Loan June 2017 Maturing July 20, 2030 \| LIBOR
Debt Instrument [Line Items]
Interest Rate	6.48%	6.48%
Margin spread on interest rate (percent)	1.23%
CLO Term Loan December 2017 Maturing January 15, 2031
Debt Instrument [Line Items]
Borrowing Outstanding	$ 43.2		43.8
CLO Term Loan December 2017 Maturing January 15, 2031 \| LIBOR
Debt Instrument [Line Items]
Interest Rate	6.63%	6.63%
Margin spread on interest rate (percent)	1.37%
CLO Term Loan March 2019 Maturing March 2032
Debt Instrument [Line Items]
Borrowing Outstanding	$ 1.8		1.8
CLO Term Loan March 2019 Maturing March 2032 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	11.63%	11.63%
CLO Term Loan August 2019 Maturing August 2032
Debt Instrument [Line Items]
Borrowing Outstanding	$ 3.9		3.9
CLO Term Loan August 2019 Maturing August 2032 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	8.06%	8.06%
CLO Term Loan September 2020 Maturing April 2033
Debt Instrument [Line Items]
Borrowing Outstanding	$ 19.4		19.1
CLO Term Loan September 2020 Maturing April 2033 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	4.76%	4.76%
CLO Term Loan Maturing January 2034
Debt Instrument [Line Items]
Borrowing Outstanding	$ 20.3		19.9
CLO Term Loan Maturing January 2034 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.67%	5.67%
CLO Term Loan Maturing August 2030
Debt Instrument [Line Items]
Borrowing Outstanding	$ 18.1		19.1
CLO Term Loan Maturing August 2030 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	4.71%	4.71%
CLO Term Loan March 2021 Maturing March 2032
Debt Instrument [Line Items]
Borrowing Outstanding	$ 18.3		18.0
CLO Term Loan March 2021 Maturing March 2032 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.23%	5.23%
CLO Term Loan Maturing April 2033
Debt Instrument [Line Items]
Borrowing Outstanding	$ 3.5		3.4
CLO Term Loan Maturing April 2033 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	9.03%	9.03%
CLO Term Loan May2021 Maturing November2031
Debt Instrument [Line Items]
Borrowing Outstanding	$ 15.3		15.0
CLO Term Loan May2021 Maturing November2031 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	4.69%	4.69%
CLO Term Loan June 2021 Maturing January 2034
Debt Instrument [Line Items]
Borrowing Outstanding	$ 20.4		20.0
CLO Term Loan June 2021 Maturing January 2034 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.46%	5.46%
CLO Term Loan Maturing November 2031
Debt Instrument [Line Items]
Borrowing Outstanding	$ 1.3		1.3
CLO Term Loan Maturing November 2031 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	6.17%	6.17%
CLO Term Loan July 2021 Maturing July 15, 2034
Debt Instrument [Line Items]
Borrowing Outstanding	$ 15.3		15.0
CLO Term Loan July 2021 Maturing July 15, 2034 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.47%	5.47%
CLO Term Loan July 2021 Maturing July 20, 2031
Debt Instrument [Line Items]
Borrowing Outstanding	$ 20.4		20.0
CLO Term Loan July 2021 Maturing July 20, 2031 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.48%	5.48%
CLO Term Loan August 2021 Maturing August 2032
Debt Instrument [Line Items]
Borrowing Outstanding	$ 16.5		16.2
CLO Term Loan August 2021 Maturing August 2032 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.07%	5.07%
CLO Term Loan October 2021 Maturing October 2035
Debt Instrument [Line Items]
Borrowing Outstanding	$ 23.7		23.3
CLO Term Loan October 2021 Maturing October 2035 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.58%	5.58%
CLO Term Loan November 2021 Maturing January 2034
Debt Instrument [Line Items]
Borrowing Outstanding	$ 14.1		13.8
CLO Term Loan November 2021 Maturing January 2034 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.26%	5.26%
CLO Term Loan January 2022 Maturing February 15, 2035
Debt Instrument [Line Items]
Borrowing Outstanding	$ 20.5		20.1
CLO Term Loan January 2022 Maturing February 15, 2035 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.70%	5.70%
CLO Term Loan February 2022 Maturing November 10, 2035
Debt Instrument [Line Items]
Borrowing Outstanding	$ 20.5		20.1
CLO Term Loan February 2022 Maturing November 10, 2035 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	5.73%	5.73%
CLO Term Loan July 2022 Maturing January 13, 2035
Debt Instrument [Line Items]
Borrowing Outstanding	$ 17.3		16.9
CLO Term Loan July 2022 Maturing January 13, 2035 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	6.43%	6.43%
CLO Term Loan October 2022 Maturing October 2035
Debt Instrument [Line Items]
Borrowing Outstanding	$ 17.9		17.5
CLO Term Loan October 2022 Maturing October 2035 \| Average Effective Interest Rate
Debt Instrument [Line Items]
Interest Rate	7.03%	7.03%
CLO Borrowings
Debt Instrument [Line Items]
Borrowing Outstanding	$ 423.4		$ 421.7
CLO Term Loan Various \| Average Effective Interest Rate
Debt Instrument [Line Items]
Margin spread on interest rate (percent)	0.50%