Borrowings - Outstanding Debt Obligations (Details) $ in Thousands, € in Millions, £ in Millions, $ in Millions, $ in Millions |
Sep. 30, 2024
USD ($)
|
Sep. 30, 2024
AUD ($)
|
Sep. 30, 2024
GBP (£)
|
Sep. 30, 2024
EUR (€)
|
Sep. 12, 2024
USD ($)
|
Sep. 11, 2024
USD ($)
|
May 23, 2024
USD ($)
|
Dec. 31, 2023
USD ($)
|
Dec. 31, 2023
AUD ($)
|
Dec. 31, 2023
GBP (£)
|
Dec. 31, 2023
EUR (€)
|
Dec. 31, 2023
CAD ($)
|
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 |
$ 7,698,000
|
|
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|
$ 5,698,000
|
|
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|
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Principal Outstanding |
|
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$ 526,000
|
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$ 429,100
|
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Total |
5,533,442
|
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|
4,210,379
|
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Total |
5,516,651
|
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|
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|
4,206,900
|
|
|
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Unused Portion |
2,164,558
|
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|
1,487,621
|
|
|
|
|
|
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|
|
|
|
|
|
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|
Remaining borrowing capacity |
995,309
|
|
|
|
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|
862,409
|
|
|
|
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|
|
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|
|
|
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|
Unamortized issuance costs |
54,655
|
|
|
|
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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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|
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|
|
800,000
|
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|
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|
$ 600,000
|
|
$ 800,000
|
|
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|
Principal Outstanding |
608,781
|
$ 94.4
|
£ 42.9
|
|
|
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|
615,838
|
$ 156.0
|
£ 42.9
|
€ 7.5
|
|
|
|
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|
|
|
|
|
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|
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|
Long-term debt, carrying value |
608,781
|
|
|
|
|
|
|
615,838
|
|
|
|
|
|
|
|
|
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Unused Portion |
191,219
|
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|
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|
184,162
|
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|
|
|
|
|
|
|
|
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Remaining borrowing capacity |
11,932
|
|
|
|
|
|
|
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
|
Principal Outstanding |
763,388
|
$ 25.5
|
90.3
|
€ 3.4
|
|
|
|
513,747
|
108.0
|
90.3
|
3.4
|
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|
Long-term debt, carrying value |
763,388
|
|
|
|
|
|
|
513,747
|
|
|
|
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|
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|
Unused Portion |
486,612
|
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|
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|
|
486,253
|
|
|
|
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|
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|
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|
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|
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|
Remaining borrowing capacity |
29,662
|
|
|
|
|
|
|
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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|
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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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|
Principal Outstanding |
487,500
|
|
|
|
|
|
|
487,500
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
Long-term debt, carrying value |
487,500
|
|
|
|
|
|
|
487,500
|
|
|
|
|
|
|
|
|
|
|
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Unused Portion |
262,500
|
|
|
|
|
|
|
262,500
|
|
|
|
|
|
|
|
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|
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Remaining borrowing capacity |
17,482
|
|
|
|
|
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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
|
|
$ 250,000
|
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|
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|
Principal Outstanding |
275,000
|
|
|
|
|
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|
195,000
|
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|
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|
Long-term debt, carrying value |
275,000
|
|
|
|
|
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|
195,000
|
|
|
|
|
|
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|
|
|
|
|
|
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|
Unused Portion |
225,000
|
|
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|
|
|
|
305,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
Remaining borrowing capacity |
61,945
|
|
|
|
|
|
|
205,018
|
|
|
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|
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|
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HLEND E Funding Facility | Line of credit |
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Debt Instrument [Line Items] |
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|
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|
Line of credit maximum borrowing capacity |
300,000
|
|
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|
|
|
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Principal Outstanding |
0
|
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Long-term debt, carrying value |
0
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|
|
|
|
|
|
|
|
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|
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|
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Unused Portion |
300,000
|
|
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|
|
|
|
|
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|
|
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|
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|
Remaining borrowing capacity |
175,061
|
|
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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 |
1,375,000
|
|
|
|
$ 1,375,000
|
$ 1,300,000
|
|
1,275,000
|
|
|
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|
Principal Outstanding |
675,773
|
|
£ 64.2
|
€ 130.3
|
|
|
|
1,025,294
|
$ 95.2
|
£ 64.2
|
€ 312.1
|
$ 47.1
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
675,773
|
|
|
|
|
|
|
1,025,294
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
Unused Portion |
699,227
|
|
|
|
|
|
|
249,706
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Remaining borrowing capacity |
699,227
|
|
|
|
|
|
|
249,706
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
November 2025 notes | Senior notes |
|
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|
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|
Debt Instrument [Line Items] |
|
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|
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|
Maximum principal amount |
170,000
|
|
|
|
|
|
|
170,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 170,000
|
|
|
Principal Outstanding |
170,000
|
|
|
|
|
|
|
170,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
169,255
|
|
|
|
|
|
|
168,749
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
700
|
|
|
|
|
|
|
1,200
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
0
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
November 2027 notes | Senior notes |
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
Debt Instrument [Line Items] |
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
155,000
|
|
|
|
|
|
|
155,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 155,000
|
|
|
Principal Outstanding |
155,000
|
|
|
|
|
|
|
155,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
154,838
|
|
|
|
|
|
|
154,366
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
1,100
|
|
|
|
|
|
|
1,400
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
900
|
|
|
|
|
|
|
700
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
March 2026 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
276,000
|
|
|
|
|
|
|
276,000
|
|
|
|
|
|
|
|
|
|
$ 276,000
|
|
|
|
|
|
|
Principal Outstanding |
276,000
|
|
|
|
|
|
|
276,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
277,137
|
|
|
|
|
|
|
274,716
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
1,200
|
|
|
|
|
|
|
1,800
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
2,400
|
|
|
|
|
|
|
600
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
March 2028 notes | Line of credit |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Principal Outstanding |
|
|
|
|
|
|
|
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
|
|
|
|
|
|
|
Principal Outstanding |
124,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
125,205
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
800
|
|
|
|
|
|
|
900
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
2,000
|
|
|
|
|
|
|
500
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
September 2027 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
75,000
|
|
|
|
|
|
|
75,000
|
|
|
|
|
|
$ 75,000
|
|
|
|
|
|
|
|
|
|
|
Principal Outstanding |
75,000
|
|
|
|
|
|
|
75,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
76,275
|
|
|
|
|
|
|
75,545
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
600
|
|
|
|
|
|
|
700
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
1,900
|
|
|
|
|
|
|
1,300
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
September 2028 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
250,000
|
|
|
|
|
|
|
250,000
|
|
|
|
|
|
$ 250,000
|
|
|
|
|
|
|
|
|
|
|
Principal Outstanding |
250,000
|
|
|
|
|
|
|
250,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
255,529
|
|
|
|
|
|
|
252,814
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
2,100
|
|
|
|
|
|
|
2,500
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
7,600
|
|
|
|
|
|
|
5,300
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
January 2029 notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
550,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Principal Outstanding |
550,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
548,498
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
10,900
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
9,400
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
September 2029 Notes | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
400,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Principal Outstanding |
400,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
404,602
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
9,100
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net cumulative increase (decrease) from hedging activities |
13,700
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CLO Secured notes 2023 | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
323,000
|
|
|
|
|
|
|
323,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Principal Outstanding |
323,000
|
|
|
|
|
|
|
323,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
319,949
|
|
|
|
|
|
|
319,743
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
3,100
|
|
|
|
|
|
|
$ 3,300
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CLO Secured Notes 2024 | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum principal amount |
400,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Principal Outstanding |
400,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term debt, carrying value |
374,921
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CLO Secured Notes 2024 | Senior notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unamortized issuance costs |
$ 25,100
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|