Borrowings - Narrative (Details) - USD ($)
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3 Months Ended |
6 Months Ended |
12 Months Ended |
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Apr. 10, 2026 |
Apr. 09, 2026 |
Oct. 02, 2025 |
Jun. 30, 2025 |
Dec. 27, 2024 |
Aug. 30, 2024 |
May 06, 2024 |
Apr. 24, 2024 |
Jan. 24, 2024 |
Oct. 04, 2023 |
Aug. 21, 2023 |
Jun. 30, 2026 |
Jun. 30, 2026 |
Apr. 09, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 18, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 29, 2025 |
Sep. 22, 2022 |
Dec. 31, 2025 |
Jan. 16, 2025 |
Oct. 22, 2024 |
Sep. 23, 2020 |
Sep. 22, 2020 |
| Debt Instrument [Line Items] |
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| Covenant asset coverage ratio |
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150.00%
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200.00%
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| Senior securities, amount |
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$ 2,300,000,000
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$ 2,300,000,000
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$ 2,300,000,000
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| Ratio of debt related expenses to average net assets attributable to common stock |
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178.00%
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178.00%
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178.00%
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| Interest rate (in percentage) |
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2.80%
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3.60%
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2.80%
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| Short-term borrowings |
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$ 0
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$ 0
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$ 0
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$ 0
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| Interest expense, short-term borrowings |
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0
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$ 0
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0
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$ 0
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| Secured borrowings |
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$ 0
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0
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0
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0
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| Borrowing interest expense |
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$ 0
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$ 0
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0
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400,000
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| Secured debt average outstanding amount |
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$ 0
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$ 12,700,000
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| Secured debt weighted average interest rate |
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5.71%
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| 2024 Notes | Senior Notes |
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| Debt Instrument [Line Items] |
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| Debt instrument, face amount |
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$ 100,000,000.0
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| Debt instrument, interest rate, stated percentage |
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4.85%
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| Debt instrument, redemption price, percentage |
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100.00%
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| 2026 Notes | Senior Notes |
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| Debt Instrument [Line Items] |
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| Debt instrument, face amount |
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$ 300,000,000.0
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| Debt instrument, interest rate, stated percentage |
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3.25%
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| Debt instrument, redemption price, percentage |
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100.00%
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| Restricted2026 Notes | Senior Notes |
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| Debt Instrument [Line Items] |
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| Debt instrument, redemption price, percentage |
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99.88%
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| 2029 Notes | Senior Notes |
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| Debt Instrument [Line Items] |
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| Debt instrument, face amount |
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$ 300,000,000.0
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$ 400,000,000.0
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| Debt instrument, interest rate, stated percentage |
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7.20%
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7.20%
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7.20%
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7.20%
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7.20%
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7.20%
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7.20%
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7.20%
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| Debt instrument, redemption price, percentage |
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100.00%
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| Debt instrument, additional aggregate principal amount |
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$ 100,000,000.0
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| 2030 Notes | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate (in percentage) |
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2.515%
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| Debt instrument, face amount |
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$ 300,000,000.0
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| Debt instrument, interest rate, stated percentage |
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6.00%
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| Debt instrument, redemption price, percentage |
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100.00%
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| Interest and debt expense |
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$ 5,073,000
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$ 0
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$ 10,077,000
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$ 0
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| Borrowing interest expense |
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4,500,000
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9,000,000
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| Revolving Credit Facility | Line of Credit |
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| Debt Instrument [Line Items] |
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| Aggregate borrowing capacity |
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$ 2,930,000,000
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2,930,000,000
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$ 2,930,000,000
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3,130,000,000
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| Weighted average annualized interest cost percentage |
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5.99%
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6.20%
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| Average daily debt outstanding |
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$ 2,200,000,000
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$ 2,100,000,000
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| Maximum debt outstanding |
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2,600,000,000
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2,300,000,000
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| Revolving Credit Facility | JPM Credit Facility | Line of Credit |
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| Debt Instrument [Line Items] |
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| Aggregate borrowing capacity |
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$ 1,050,000,000
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$ 800,000,000.0
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$ 400,000,000.0
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$ 400,000,000.0
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1,050,000,000
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1,050,000,000
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$ 1,050,000,000
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$ 1,050,000,000
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$ 1,050,000,000
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1,050,000,000
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| Interest rate (in percentage) |
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2.15%
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2.25%
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2.55%
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2.75%
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2.15%
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2.15%
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2.25%
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| Unused commitment fee |
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0.75%
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0.55%
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0.55%
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| Maximum borrowing capacity, increase limit |
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$ 1,050,000,000
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$ 800,000,000.0
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| Revolving Credit Facility | FBLC JPM Credit Facility | Line of Credit |
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| Debt Instrument [Line Items] |
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| Aggregate borrowing capacity |
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$ 400,000,000.0
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| Interest rate (in percentage) |
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2.80%
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| Maximum borrowing capacity, increase limit |
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$ 800,000,000.0
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| Revolving Credit Facility | FBLC JPM Credit Facility | Line of Credit | Minimum |
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| Debt Instrument [Line Items] |
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| Unused commitment fee |
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0.75%
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| Revolving Credit Facility | FBLC JPM Credit Facility | Line of Credit | Maximum |
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| Debt Instrument [Line Items] |
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| Unused commitment fee |
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3.00%
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| Revolving Credit Facility | JPM Revolver Facility | Line of Credit |
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| Debt Instrument [Line Items] |
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| Aggregate borrowing capacity |
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$ 505,000,000.0
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780,000,000
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$ 780,000,000
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$ 780,000,000
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780,000,000
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| Interest rate (in percentage) |
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1.98%
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1.98%
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1.98%
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| Unused commitment fee |
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0.38%
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0.38%
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0.38%
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0.38%
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0.38%
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| Revolving Credit Facility | JPM Revolver Facility Amendment | Line of Credit |
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| Debt Instrument [Line Items] |
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| Aggregate borrowing capacity |
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$ 780,000,000.0
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| Maximum borrowing capacity, increase limit |
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$ 1,170,000,000
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| Revolving Credit Facility | Wells Fargo Credit Facility | Line of Credit |
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| Debt Instrument [Line Items] |
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| Aggregate borrowing capacity |
$ 400,000,000.0
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$ 300,000,000.0
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$ 300,000,000.0
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$ 400,000,000
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$ 400,000,000
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$ 300,000,000.0
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$ 400,000,000
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300,000,000
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| Interest rate (in percentage) |
2.15%
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1.95%
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2.15%
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2.75%
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1.95%
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2.15%
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2.15%
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| Unused commitment fee |
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0.35%
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| Floor on interest rate |
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0.00%
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0.00%
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0.00%
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0.00%
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| Non-usage rate, unused balance, percentage |
70.00%
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| Revolving Credit Facility | Wells Fargo Credit Facility | Line of Credit | Debt Instrument, Non-Usage Fee, Period One |
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| Debt Instrument [Line Items] |
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| Unused commitment fee |
0.35%
|
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| Revolving Credit Facility | Wells Fargo Credit Facility | Line of Credit | Debt Instrument, Non-Usage Fee, Period Two |
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| Debt Instrument [Line Items] |
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| Unused commitment fee |
0.50%
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| Revolving Credit Facility | Wells Fargo Credit Facility | Line of Credit | Minimum |
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|
| Debt Instrument [Line Items] |
|
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| Unused commitment fee |
|
|
|
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|
|
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|
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|
0.50%
|
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|
0.50%
|
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| Non-usage rate, unused balance, percentage |
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|
70.00%
|
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|
70.00%
|
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| Revolving Credit Facility | Wells Fargo Credit Facility | Line of Credit | Minimum | Debt Instrument, Non-Usage Fee, Period Three |
|
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| Debt Instrument [Line Items] |
|
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|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
| Unused commitment fee |
0.50%
|
|
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| Revolving Credit Facility | Wells Fargo Credit Facility | Line of Credit | Maximum |
|
|
|
|
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|
| Debt Instrument [Line Items] |
|
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|
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|
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| Unused commitment fee |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.00%
|
|
|
|
|
2.00%
|
|
|
|
|
|
|
|
| Revolving Credit Facility | Wells Fargo Credit Facility | Line of Credit | Maximum | Debt Instrument, Non-Usage Fee, Period Three |
|
|
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|
|
| Debt Instrument [Line Items] |
|
|
|
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|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Unused commitment fee |
1.50%
|
|
|
|
|
|
|
|
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|
|
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|
| Revolving Credit Facility | 2029 Notes | Line of Credit |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
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|
|
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|
| Aggregate borrowing capacity |
|
|
|
|
|
|
|
|
|
|
|
$ 400,000,000
|
$ 400,000,000
|
|
|
|
|
$ 400,000,000
|
|
|
|
$ 400,000,000
|
|
|
|
|