Borrowings - Outstanding Debt Obligations (Details) $ in Thousands, € in Millions, £ in Millions, $ in Millions, $ in Millions |
Mar. 31, 2024
USD ($)
|
Mar. 31, 2024
EUR (€)
|
Mar. 31, 2024
AUD ($)
|
Mar. 31, 2024
GBP (£)
|
Mar. 31, 2024
CAD ($)
|
Jan. 17, 2024
USD ($)
|
Jan. 16, 2024
USD ($)
|
Dec. 31, 2023
USD ($)
|
Dec. 31, 2023
EUR (€)
|
Dec. 31, 2023
AUD ($)
|
Dec. 31, 2023
GBP (£)
|
Dec. 31, 2023
CAD ($)
|
Oct. 05, 2023
USD ($)
|
Sep. 14, 2023
USD ($)
|
Aug. 01, 2023
USD ($)
|
Jun. 22, 2023
USD ($)
|
Mar. 31, 2023
USD ($)
|
Mar. 15, 2023
USD ($)
|
Feb. 03, 2023
USD ($)
|
Jan. 12, 2023
USD ($)
|
Dec. 23, 2022
USD ($)
|
Nov. 14, 2022
USD ($)
|
Sep. 16, 2022
USD ($)
|
Jul. 19, 2022
USD ($)
|
Debt Instrument [Line Items] |
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Total |
$ 6,823,000
|
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|
$ 5,698,000
|
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Par Size ($) |
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$ 429,100
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Total |
3,859,638
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4,210,379
|
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Total |
3,826,106
|
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|
4,206,900
|
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Unused Portion |
2,963,362
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|
1,487,621
|
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Remaining borrowing capacity |
1,624,993
|
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|
862,409
|
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Unamortized issuance costs |
23,251
|
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|
11,833
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HLEND A Funding Facility | Line of credit |
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Debt Instrument [Line Items] |
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Line of credit maximum borrowing capacity |
800,000
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|
800,000
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$ 600,000
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|
$ 800,000
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Par Size ($) |
603,407
|
€ 7.5
|
$ 94.4
|
£ 42.9
|
|
|
|
615,838
|
€ 7.5
|
$ 156.0
|
£ 42.9
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|
Long-term debt, carrying value |
603,407
|
|
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|
615,838
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Unused Portion |
196,593
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|
184,162
|
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Remaining borrowing capacity |
22,937
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|
38,218
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HLEND B Funding Facility | Line of credit |
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Debt Instrument [Line Items] |
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Line of credit maximum borrowing capacity |
1,250,000
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1,000,000
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$ 1,250,000
|
$ 1,000,000
|
Par Size ($) |
316,767
|
3.4
|
25.5
|
90.3
|
|
|
|
513,747
|
3.4
|
108.0
|
90.3
|
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Long-term debt, carrying value |
316,767
|
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|
513,747
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Unused Portion |
933,233
|
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|
486,253
|
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Remaining borrowing capacity |
422,167
|
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|
356,891
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HLEND C Funding Facility | Line of credit |
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Debt Instrument [Line Items] |
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|
Line of credit maximum borrowing capacity |
750,000
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750,000
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$ 750,000
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|
$ 400,000
|
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|
Par Size ($) |
487,500
|
|
|
|
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|
487,500
|
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|
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|
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|
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|
|
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Long-term debt, carrying value |
487,500
|
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|
|
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|
487,500
|
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|
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Unused Portion |
262,500
|
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|
262,500
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Remaining borrowing capacity |
46,103
|
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|
12,576
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HLEND D Funding Facility | Line of credit |
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Debt Instrument [Line Items] |
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Line of credit maximum borrowing capacity |
500,000
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500,000
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$ 500,000
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$ 250,000
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Par Size ($) |
125,000
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195,000
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Long-term debt, carrying value |
125,000
|
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|
195,000
|
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Unused Portion |
375,000
|
|
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|
305,000
|
|
|
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|
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Remaining borrowing capacity |
237,750
|
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|
|
205,018
|
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HLEND E Funding Facility | Line of credit |
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Debt Instrument [Line Items] |
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Line of credit maximum borrowing capacity |
300,000
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Par Size ($) |
0
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Long-term debt, carrying value |
0
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Unused Portion |
300,000
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Remaining borrowing capacity |
0
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Senior secured revolving credit facility | Line of credit |
|
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Debt Instrument [Line Items] |
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Line of credit maximum borrowing capacity |
1,300,000
|
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|
$ 1,300,000
|
$ 1,275,000
|
1,275,000
|
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|
Par Size ($) |
403,964
|
€ 180.6
|
$ 73.2
|
£ 64.2
|
$ 47.1
|
|
|
1,025,294
|
€ 312.1
|
$ 95.2
|
£ 64.2
|
$ 47.1
|
|
|
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|
|
|
|
|
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|
Long-term debt, carrying value |
403,964
|
|
|
|
|
|
|
1,025,294
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
Unused Portion |
896,036
|
|
|
|
|
|
|
249,706
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Remaining borrowing capacity |
896,036
|
|
|
|
|
|
|
249,706
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
November 2025 notes | Senior notes |
|
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|
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|
Debt Instrument [Line Items] |
|
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|
Maximum principal amount |
170,000
|
|
|
|
|
|
|
170,000
|
|
|
|
|
|
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|
|
|
|
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|
$ 170,000
|
|
|
Par Size ($) |
170,000
|
|
|
|
|
|
|
170,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
167,908
|
|
|
|
|
|
|
168,749
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
1,000
|
|
|
|
|
|
|
1,200
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
(1,000)
|
|
|
|
|
|
|
(0)
|
|
|
|
|
|
|
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|
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|
November 2027 notes | Senior notes |
|
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|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
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|
Debt Instrument [Line Items] |
|
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|
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|
|
|
|
|
|
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|
|
|
|
|
|
|
|
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|
Maximum principal amount |
155,000
|
|
|
|
|
|
|
155,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 155,000
|
|
|
Par Size ($) |
155,000
|
|
|
|
|
|
|
155,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
152,776
|
|
|
|
|
|
|
154,366
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
1,300
|
|
|
|
|
|
|
1,400
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
(900)
|
|
|
|
|
|
|
700
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
March 2026 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
Debt Instrument [Line Items] |
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
276,000
|
|
|
|
|
|
|
276,000
|
|
|
|
|
|
|
|
|
|
$ 276,000
|
|
|
|
|
|
|
Par Size ($) |
276,000
|
|
|
|
|
|
|
276,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
272,703
|
|
|
|
|
|
|
274,716
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
1,600
|
|
|
|
|
|
|
1,800
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
(1,700)
|
|
|
|
|
|
|
600
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
March 2028 notes | Line of credit |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Par Size ($) |
|
|
|
|
|
|
|
124,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
|
|
|
|
|
|
|
123,588
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
March 2028 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
124,000
|
|
|
|
|
|
|
124,000
|
|
|
|
|
|
|
|
|
|
$ 124,000
|
|
|
|
|
|
|
Par Size ($) |
124,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
121,825
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
900
|
|
|
|
|
|
|
900
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
(1,300)
|
|
|
|
|
|
|
500
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
September 2027 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
75,000
|
|
|
|
|
|
|
75,000
|
|
|
|
|
|
$ 75,000
|
|
|
|
|
|
|
|
|
|
|
Par Size ($) |
75,000
|
|
|
|
|
|
|
75,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
74,467
|
|
|
|
|
|
|
75,545
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
700
|
|
|
|
|
|
|
700
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
100
|
|
|
|
|
|
|
1,300
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
September 2028 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
250,000
|
|
|
|
|
|
|
250,000
|
|
|
|
|
|
$ 250,000
|
|
|
|
|
|
|
|
|
|
|
Par Size ($) |
250,000
|
|
|
|
|
|
|
250,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
248,524
|
|
|
|
|
|
|
252,814
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
2,300
|
|
|
|
|
|
|
2,500
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
900
|
|
|
|
|
|
|
5,300
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
January 2029 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
550,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Par Size ($) |
550,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
531,455
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
12,200
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
(6,400)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CLO Secured notes 2023 | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
323,000
|
|
|
|
|
|
|
323,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Par Size ($) |
323,000
|
|
|
|
|
|
|
323,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
319,810
|
|
|
|
|
|
|
319,743
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
$ 3,200
|
|
|
|
|
|
|
$ 3,300
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|