Debt - Maturity of Debt Obligations (Details) $ in Thousands	Sep. 30, 2026 USD ($)
Debt Instrument [Line Items]
Total	$ 7,325,000
Line of Credit
Debt Instrument [Line Items]
Less than 1 year	300,000
1-3 years	1,425,000
3-5 years	3,085,000
After 5 years	2,515,000
SPV Asset Facility I \| Line of Credit
Debt Instrument [Line Items]
Total	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	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	700,000
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	700,000
SPV Asset Facility IV \| Line of Credit
Debt Instrument [Line Items]
Total	370,000
Less than 1 year	0
1-3 years	0
3-5 years	370,000
After 5 years	0
SPV Asset Facility V \| Line of Credit
Debt Instrument [Line Items]
Total	75,000
Less than 1 year	0
1-3 years	0
3-5 years	75,000
After 5 years	0
SPV Asset Facility VI \| Line of Credit
Debt Instrument [Line Items]
Total	50,000
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	50,000
Athena CLO II \| Line of Credit
Debt Instrument [Line Items]
Total	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	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	300,000
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	300,000
January 2027 Notes \| Line of Credit
Debt Instrument [Line Items]
Total	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	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	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	700,000
Less than 1 year	0
1-3 years	700,000
3-5 years	0
After 5 years	0
Interest rate swaps October 2029 Notes \| Line of Credit
Debt Instrument [Line Items]
Total	900,000
Less than 1 year	0
1-3 years	0
3-5 years	900,000
After 5 years	0
Interest rate swaps January 2031 Notes \| Line of Credit
Debt Instrument [Line Items]
Total	400,000
Less than 1 year	0
1-3 years	0
3-5 years	400,000
After 5 years	0
September 2032 Notes \| Line of Credit
Debt Instrument [Line Items]
Total	150,000
Less than 1 year	0
1-3 years	0
3-5 years	0
After 5 years	150,000
Revolving loan commitments \| Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Total	1,015,000
Less than 1 year	0
1-3 years	0
3-5 years	1,015,000
After 5 years	$ 0