Related Party Transactions - Non-Controlled Affiliate and Controlled Affiliate Investments (Details) - USD ($)
$ in Thousands |
3 Months Ended |
12 Months Ended |
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
$ 2,508,441
|
|
|
| Realized Gains (Losses) |
(9,628)
|
$ (23,953)
|
|
| Ending Balance |
2,470,798
|
|
$ 2,508,441
|
| Non-controlled Affiliated Companies |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
18,674
|
75,733
|
75,733
|
| Gross additions |
|
|
5,279
|
| Gross reductions |
0
|
|
(60,285)
|
| Change in Unrealized Appreciation |
490
|
|
12,706
|
| Realized Gains (Losses) |
|
|
(14,759)
|
| Ending Balance |
19,164
|
|
18,674
|
| Dividend, Interest, and PIK Income |
2
|
|
165
|
| Other Income |
21
|
|
118
|
| Non-controlled Affiliated Companies | ADT Pizza, LLC | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
8,429
|
8,429
|
| Gross reductions |
|
|
(3,361)
|
| Change in Unrealized Appreciation |
0
|
|
(5,068)
|
| Ending Balance |
0
|
|
|
| Other Income |
0
|
|
3
|
| Non-controlled Affiliated Companies | Ansett Aviation Training | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
4,374
|
4,374
|
| Gross reductions |
|
|
(4,601)
|
| Change in Unrealized Appreciation |
|
|
934
|
| Realized Gains (Losses) |
|
|
(707)
|
| Dividend, Interest, and PIK Income |
2
|
|
176
|
| Non-controlled Affiliated Companies | Ansett Aviation Training | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
18,384
|
8,617
|
8,617
|
| Change in Unrealized Appreciation |
490
|
|
9,767
|
| Ending Balance |
18,874
|
|
18,384
|
| Other Income |
0
|
|
5
|
| Non-controlled Affiliated Companies | Blackbrush Oil & Gas C/S | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Gross additions |
|
|
3,209
|
| Realized Gains (Losses) |
|
|
(3,209)
|
| Non-controlled Affiliated Companies | DC Blox | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
1,408
|
1,408
|
| Gross additions |
|
|
68
|
| Gross reductions |
|
|
(1,384)
|
| Change in Unrealized Appreciation |
|
|
(92)
|
| Dividend, Interest, and PIK Income |
|
|
30
|
| Non-controlled Affiliated Companies | DC Blox | Preferred Equity |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
38,523
|
38,523
|
| Gross reductions |
|
|
(37,794)
|
| Change in Unrealized Appreciation |
|
|
(623)
|
| Realized Gains (Losses) |
|
|
(106)
|
| Non-controlled Affiliated Companies | DC Blox One | Preferred Equity |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
5,230
|
5,230
|
| Gross reductions |
|
|
(5,440)
|
| Change in Unrealized Appreciation |
|
|
(1,371)
|
| Realized Gains (Losses) |
|
|
1,581
|
| Dividend, Interest, and PIK Income |
|
|
10
|
| Non-controlled Affiliated Companies | DC Blox Two | Preferred Equity |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
4,277
|
4,277
|
| Gross reductions |
|
|
(7,346)
|
| Change in Unrealized Appreciation |
|
|
(4,265)
|
| Realized Gains (Losses) |
|
|
7,334
|
| Dividend, Interest, and PIK Income |
|
|
5
|
| Non-controlled Affiliated Companies | Direct Travel, Inc | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Other Income |
|
|
101
|
| Non-controlled Affiliated Companies | Walker Edison | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Gross additions |
|
|
52
|
| Realized Gains (Losses) |
|
|
(52)
|
| Non-controlled Affiliated Companies | Walker Edison | First Lien Senior Secured Loan - Delayed Draw |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Gross additions |
|
|
656
|
| Realized Gains (Losses) |
|
|
(656)
|
| Non-controlled Affiliated Companies | Walker Edison | First Lien Senior Secured Loan - Revolver |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
3,182
|
3,182
|
| Gross reductions |
|
|
(93)
|
| Realized Gains (Losses) |
|
|
(3,089)
|
| Dividend, Interest, and PIK Income |
|
|
(61)
|
| Non-controlled Affiliated Companies | Walker Edison | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Change in Unrealized Appreciation |
|
|
5,592
|
| Realized Gains (Losses) |
|
|
(5,592)
|
| Non-controlled Affiliated Companies | Walker Edison One | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
1,040
|
1,040
|
| Gross additions |
|
|
187
|
| Change in Unrealized Appreciation |
|
|
5,393
|
| Realized Gains (Losses) |
|
|
(6,620)
|
| Non-controlled Affiliated Companies | Walker Edison One | First Lien Senior Secured Loan - Delayed Draw |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
278
|
278
|
| Gross additions |
|
|
447
|
| Realized Gains (Losses) |
|
|
(725)
|
| Dividend, Interest, and PIK Income |
|
|
8
|
| Non-controlled Affiliated Companies | Walker Edison Two | First Lien Senior Secured Loan - Delayed Draw |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
|
238
|
238
|
| Gross additions |
|
|
104
|
| Change in Unrealized Appreciation |
|
|
1,703
|
| Realized Gains (Losses) |
|
|
(2,045)
|
| Non-controlled Affiliated Companies | Walker Edison Three | First Lien Senior Secured Loan - Delayed Draw |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
290
|
137
|
137
|
| Change in Unrealized Appreciation |
|
|
736
|
| Realized Gains (Losses) |
|
|
(873)
|
| Ending Balance |
290
|
|
290
|
| Dividend, Interest, and PIK Income |
|
|
(3)
|
| Other Income |
21
|
|
|
| Non-controlled Affiliated Companies | Walker Edison Four | First Lien Senior Secured Loan - Delayed Draw |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
290
|
|
|
| Gross additions |
|
|
290
|
| Ending Balance |
|
|
290
|
| Other Income |
|
|
9
|
| Non-controlled Affiliated Companies | Walker Edison Five | First Lien Senior Secured Loan - Delayed Draw |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Gross additions |
|
|
266
|
| Gross reductions |
|
|
(266)
|
| Controlled Affiliated Companies |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
584,470
|
581,714
|
581,714
|
| Gross additions |
12,588
|
|
47,587
|
| Gross reductions |
(53,307)
|
|
(29,639)
|
| Change in Unrealized Appreciation |
4,870
|
|
(15,192)
|
| Realized Gains (Losses) |
(13,448)
|
|
|
| Ending Balance |
535,173
|
|
584,470
|
| Dividend, Interest, and PIK Income |
16,018
|
|
55,593
|
| Controlled Affiliated Companies | Bain Capital Senior Loan Program, LLC | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
5,007
|
(4,849)
|
(4,849)
|
| Change in Unrealized Appreciation |
(1,389)
|
|
9,856
|
| Ending Balance |
3,618
|
|
5,007
|
| Dividend, Interest, and PIK Income |
2,792
|
|
5,009
|
| Controlled Affiliated Companies | Bain Capital Senior Loan Program, LLC | Preferred Equity |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
1,836
|
10
|
10
|
| Change in Unrealized Appreciation |
0
|
|
1,826
|
| Ending Balance |
1,836
|
|
1,836
|
| Dividend, Interest, and PIK Income |
985
|
|
2,631
|
| Controlled Affiliated Companies | Bain Capital Senior Loan Program, LLC | Subordinated Note Investment Vehicle |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
157,925
|
146,495
|
146,495
|
| Gross additions |
8,985
|
|
23,500
|
| Change in Unrealized Appreciation |
0
|
|
(12,070)
|
| Ending Balance |
166,910
|
|
157,925
|
| Dividend, Interest, and PIK Income |
4,460
|
|
16,131
|
| Controlled Affiliated Companies | BCC Jetstream Holdings Aviation (On II), LLC | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
4,583
|
6,933
|
6,933
|
| Change in Unrealized Appreciation |
0
|
|
(2,350)
|
| Ending Balance |
4,583
|
|
4,583
|
| Controlled Affiliated Companies | BCC Jetstream Holdings Aviation (Off I), LLC | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
7,539
|
11,405
|
11,405
|
| Change in Unrealized Appreciation |
0
|
|
(3,866)
|
| Ending Balance |
7,539
|
|
7,539
|
| Controlled Affiliated Companies | Gale Aviation (Offshore) Co | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
55,758
|
71,813
|
71,813
|
| Gross reductions |
(53,307)
|
|
(7,640)
|
| Change in Unrealized Appreciation |
10,997
|
|
(8,415)
|
| Realized Gains (Losses) |
(13,448)
|
|
|
| Ending Balance |
0
|
|
55,758
|
| Dividend, Interest, and PIK Income |
0
|
|
2,200
|
| Controlled Affiliated Companies | International Senior Loan Program, LLC | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
43,554
|
55,408
|
55,408
|
| Change in Unrealized Appreciation |
(11,956)
|
|
(11,854)
|
| Ending Balance |
31,598
|
|
43,554
|
| Dividend, Interest, and PIK Income |
856
|
|
3,623
|
| Controlled Affiliated Companies | International Senior Loan Program, LLC | Subordinated Note Investment Vehicle |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
190,729
|
190,729
|
190,729
|
| Ending Balance |
190,729
|
|
190,729
|
| Dividend, Interest, and PIK Income |
5,573
|
|
23,289
|
| Controlled Affiliated Companies | Legacy Corporate Lending HoldCo, LLC | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
1,287
|
900
|
900
|
| Change in Unrealized Appreciation |
56
|
|
387
|
| Ending Balance |
1,343
|
|
1,287
|
| Controlled Affiliated Companies | Legacy Corporate Lending HoldCo, LLC | Preferred Equity |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
68,748
|
45,009
|
45,009
|
| Gross additions |
3,599
|
|
23,850
|
| Gross reductions |
|
|
(6,750)
|
| Change in Unrealized Appreciation |
962
|
|
6,639
|
| Ending Balance |
73,309
|
|
68,748
|
| Dividend, Interest, and PIK Income |
1,350
|
|
2,700
|
| Controlled Affiliated Companies | Legacy Corporate Lending HoldCo, LLC One | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Change in Unrealized Appreciation |
4,517
|
|
|
| Ending Balance |
4,517
|
|
|
| Controlled Affiliated Companies | Lightning Holdings B, LLC | Equity Interest |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
47,423
|
57,807
|
57,807
|
| Gross additions |
|
|
150
|
| Gross reductions |
|
|
(15,249)
|
| Change in Unrealized Appreciation |
1,707
|
|
4,715
|
| Ending Balance |
49,130
|
|
47,423
|
| Controlled Affiliated Companies | Parcel2 Go | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
56
|
54
|
54
|
| Gross additions |
4
|
|
8
|
| Change in Unrealized Appreciation |
(2)
|
|
(6)
|
| Ending Balance |
58
|
|
56
|
| Dividend, Interest, and PIK Income |
2
|
|
10
|
| Controlled Affiliated Companies | SG Global Midco Limited | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
3
|
|
|
| Gross additions |
|
|
3
|
| Ending Balance |
3
|
|
3
|
| Controlled Affiliated Companies | Surrey Bidco Limited | First Lien Senior Secured Loan |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
22
|
|
|
| Gross additions |
|
|
76
|
| Gross reductions |
0
|
|
|
| Change in Unrealized Appreciation |
(22)
|
|
(54)
|
| Ending Balance |
0
|
|
22
|
| Non-controlled and controlled affiliated company |
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
| Beginning Balance |
603,144
|
$ 657,447
|
657,447
|
| Gross additions |
12,588
|
|
52,866
|
| Gross reductions |
(53,307)
|
|
(89,924)
|
| Change in Unrealized Appreciation |
5,360
|
|
(2,486)
|
| Realized Gains (Losses) |
(13,448)
|
|
(14,759)
|
| Ending Balance |
554,337
|
|
603,144
|
| Dividend, Interest, and PIK Income |
16,020
|
|
55,758
|
| Other Income |
$ 21
|
|
$ 118
|