Debt - CLOs (Details) - USD ($)			3 Months Ended		9 Months Ended
	Aug. 15, 2024	Dec. 13, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Issuance of common shares			$ 324,993,000	$ 200,000,000	$ 874,984,000	$ 499,992,000
Preferred equity investments | Athena CLO II
Debt Instrument [Line Items]
Issuance of common shares		$ 187,300,000
Shares issued (in shares)		187,300
Issue price (in usd per share)		$ 1,000
Preferred equity investments | Athena CLO IV
Debt Instrument [Line Items]
Issuance of common shares	$ 159,700,000
Shares issued (in shares)	159,700
Issue price (in usd per share)	$ 1,000
Middle Market Loans | Athena CLO II
Debt Instrument [Line Items]
Aggregate Principal Committed		$ 83,900,000
Middle Market Loans | Athena Funding I LLC
Debt Instrument [Line Items]
Aggregate Principal Committed	$ 182,379,000	380,600,000
Middle Market Loans | Athena CLO IV
Debt Instrument [Line Items]
Aggregate Principal Committed	215,530,000
Athena CLO II | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed		475,300,000
Athena CLO II Class A Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed		$ 40,000,000.0
Basis spread on variable rate		2.85%
Athena CLO II Class B-1 Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed		$ 16,500,000
Basis spread on variable rate		3.95%
Athena CLO II Class B-2 Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed		$ 7,500,000
Interest rate, stated percentage		7.25%
Athena CLO II Class C Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed		$ 24,000,000.0
Basis spread on variable rate		4.95%
Athena CLO II Class A-L Loans | Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate		2.85%
Aggregate Principal Committed		$ 200,000,000.0
Athena CLO IV | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed	399,700,000
Athena CLO IV Class A Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed	$ 208,000,000
Basis spread on variable rate	2.00%
Athena CLO IV Class B-1 Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed	$ 7,000,000.0
Basis spread on variable rate	2.50%
Athena CLO IV Class B-2 Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed	$ 13,000,000.0
Interest rate, stated percentage	6.254%
Athena CLO IV Class C Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Committed	$ 12,000,000
Basis spread on variable rate	2.64%