Debt - Unsecured Notes (Details) - USD ($)
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9 Months Ended |
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Jun. 17, 2026 |
Jun. 05, 2026 |
Nov. 15, 2025 |
Oct. 15, 2025 |
May 30, 2025 |
Apr. 28, 2025 |
Apr. 04, 2024 |
Jun. 14, 2021 |
Sep. 23, 2020 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 03, 2026 |
Aug. 20, 2026 |
Jan. 23, 2026 |
Dec. 31, 2025 |
Jan. 21, 2025 |
Sep. 27, 2023 |
Jun. 17, 2021 |
Dec. 17, 2020 |
Jun. 12, 2020 |
| Debt Instrument [Line Items] |
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| Borrowings on debt |
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$ 4,405,500,000
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$ 1,620,000,000
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| Unsecured debt investments | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Notional amount |
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2,800,000,000
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$ 1,350,000,000
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| June 2025 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 210,000,000.0
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$ 210,000,000
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| Derivative, fixed interest rate |
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6.75%
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| Redemption price, percentage |
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100.00%
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100.00%
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| Debt repurchased |
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$ 210,000,000.0
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| Interest rate, stated percentage |
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6.75%
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| March 2028 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 400,000,000
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| Interest rate, stated percentage |
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4.75%
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| Borrowings on debt |
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$ 250,000,000
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| March 2028 Notes | Secured Debt |
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| Debt Instrument [Line Items] |
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| Debt instrument, repurchase amount |
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$ 650,000,000
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$ 650,000,000
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| Debt instrument, percentage of principal amount redeemed |
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100.00%
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100.00%
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| June 2026 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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375,000,000
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$ 375,000,000
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| Interest rate, stated percentage |
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3.75%
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3.75%
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| June 2026 Notes | Secured Debt |
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| Debt Instrument [Line Items] |
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| Debt instrument, repurchase amount |
$ 375,000,000
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| Debt instrument, percentage of principal amount redeemed |
100.00%
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| January 2027 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 300,000,000
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$ 300,000,000
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300,000,000
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| Redemption price, percentage |
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100.00%
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| Interest rate, stated percentage |
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2.50%
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| Interest rate swaps March 2028 Notes | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Company Pays |
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1.767%
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| Interest rate swaps March 2028 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 650,000,000
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$ 650,000,000
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$ 650,000,000.0
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| Interest rate, stated percentage |
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6.10%
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| Interest rate swaps March 2028 Notes | Unsecured debt investments | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Derivative, fixed interest rate |
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6.10%
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6.10%
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[1] |
6.10%
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| Notional amount |
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$ 650,000,000
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$ 650,000,000
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[1] |
$ 650,000,000.0
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| Company Pays |
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1.77%
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1.767%
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[1] |
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| Interest rate swaps October 2029 Notes | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Company Pays |
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2.538%
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2.355%
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| Interest rate swaps October 2029 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 500,000,000.0
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$ 900,000,000
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$ 400,000,000.0
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| Redemption price, percentage |
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100.00%
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| Interest rate, stated percentage |
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6.50%
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6.50%
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| Interest rate swaps October 2029 Notes | Unsecured debt investments | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Derivative, fixed interest rate |
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6.50%
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6.50%
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6.50%
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| Notional amount |
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$ 500,000,000.0
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$ 500,000,000
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$ 400,000,000.0
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| Company Pays |
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2.54%
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| Interest rate swaps January 2031 Notes | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Company Pays |
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2.495%
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| Interest rate swaps January 2031 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 400,000,000
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$ 400,000,000.0
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| Interest rate, stated percentage |
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6.125%
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| Interest rate swaps January 2031 Notes | Unsecured debt investments | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Derivative, fixed interest rate |
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6.13%
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6.125%
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| Notional amount |
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$ 400,000,000
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$ 400,000,000.0
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| Company Pays |
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2.50%
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| September 2028 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 75,000,000
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$ 75,000,000
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$ 75,000,000.0
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| Derivative, fixed interest rate |
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8.50%
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| Debt instrument, covenant, minimum asset coverage ratio |
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1.50
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| September 2028 Notes | Unsecured debt investments | Debt agreement event one |
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| Debt Instrument [Line Items] |
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| Debt instrument, fixed interest rate above stated rate |
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1.00%
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| September 2028 Notes | Unsecured debt investments | Debt agreement event two |
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| Debt Instrument [Line Items] |
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| Debt instrument, fixed interest rate above stated rate |
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1.50%
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| September 2028 Notes | Unsecured debt investments | Debt agreement event three |
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| Debt Instrument [Line Items] |
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| Debt instrument, fixed interest rate above stated rate |
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2.00%
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| Interest rate swaps April 2029 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 700,000,000.0
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$ 700,000,000
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$ 700,000,000
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| Redemption price, percentage |
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100.00%
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| Interest rate, stated percentage |
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6.75%
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| Interest rate swaps April 2029 Notes | Unsecured debt investments | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Derivative, fixed interest rate |
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6.75%
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6.75%
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6.75%
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[2] |
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| Notional amount |
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$ 700,000,000.0
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$ 700,000,000
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$ 700,000,000
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[2] |
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| Company Pays |
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2.565%
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2.56%
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2.5645%
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[2] |
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| September 2032 Notes | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Company Pays |
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3.228%
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| September 2032 Notes | Unsecured debt investments |
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| Debt Instrument [Line Items] |
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| Aggregate Principal Committed |
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$ 150,000,000
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$ 150,000,000.0
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| Interest rate, stated percentage |
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7.60%
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| Debt instrument, covenant, minimum asset coverage ratio |
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1.50
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| September 2032 Notes | Unsecured debt investments | Debt agreement event one |
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| Debt Instrument [Line Items] |
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| Debt instrument, fixed interest rate above stated rate |
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1.00%
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| September 2032 Notes | Unsecured debt investments | Debt agreement event two |
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| Debt Instrument [Line Items] |
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| Debt instrument, fixed interest rate above stated rate |
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1.50%
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| September 2032 Notes | Unsecured debt investments | Debt agreement event three |
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| Debt Instrument [Line Items] |
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| Debt instrument, fixed interest rate above stated rate |
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2.00%
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| September 2032 Notes | Unsecured debt investments | Interest Rate Swaps |
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| Debt Instrument [Line Items] |
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| Derivative, fixed interest rate |
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7.60%
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7.60%
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| Notional amount |
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$ 150,000,000
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$ 150,000,000.0
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| Company Pays |
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3.23%
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