Debt - Maturity of Debt Obligations (Details) $ in Thousands	Mar. 31, 2026 USD ($)
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	$ 6,974,500
Line of Credit
Debt Instrument [Line Items]
Less than 1 year	675,000
1-3 years	725,000
3-5 years	3,335,000
After 5 years	2,239,500
SPV Asset Facility I \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	700,000
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	700,000
SPV Asset Facility II \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	325,000
Less than 1 year	0
1-3 years	0
3-5 years	325,000
After 5 years	0
SPV Asset Facility III \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	624,500
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	624,500
SPV Asset Facility IV \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	270,000
Less than 1 year	0
1-3 years	0
3-5 years	270,000
After 5 years	0
Athena CLO II \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	375,000
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	375,000
Athena CLO IV \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	240,000
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	240,000
Athena CLO V \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	300,000
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	300,000
June 2026 Notes \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	375,000
Less than 1 year	375,000
1-3 years	0
3-5 years	0
After 5 years	0
January 2027 Notes \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	300,000
Less than 1 year	300,000
1-3 years	0
3-5 years	0
After 5 years	0
Interest rate swaps March 2028 Notes \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	650,000
Less than 1 year	0
1-3 years	650,000
3-5 years	0
After 5 years	0
September 2028 Notes \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	75,000
Less than 1 year	0
1-3 years	75,000
3-5 years	0
After 5 years	0
Interest rate swaps April 2029 Notes \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	700,000
Less than 1 year	0
1-3 years	0
3-5 years	700,000
After 5 years	0
Interest rate swaps January 2031 Notes \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	400,000
Less than 1 year	0
1-3 years	0
3-5 years	400,000
After 5 years	0
Revolving loan commitments \| Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Total Debt (net of unamortized debt issuance costs)	1,640,000
Less than 1 year	0
1-3 years	0
3-5 years	1,640,000
After 5 years	$ 0