v3.26.3
CONSOLIDATED SCHEDULE OF INVESTMENTS - PY (Parenthetical) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
% of Net Assets 136.77% 148.98%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 3,120,386,000  
Fair value, ending balance $ 10,566,935,000 $ 3,120,386,000
Investment, Affiliated Issuer    
% of Net Assets 12.35% 12.07%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 252,545,000 $ 0
Gross Additions 749,844,000 238,347,000
Gross Reductions 49,957,000 0
Net realized gains/(losses) 0 0
Net unrealized gains/(losses) 1,556,000 14,198,000
Fair value, ending balance 953,988,000 252,545,000
Dividend and Interest Income $ 33,281,000 $ 0
Investments, At Fair Value, And Other Non-Qualifying Assets | Customer Concentration Risk | Non-Qualifying Assets    
% of Total Assets   70.00%
Concentration risk 6.68% 0.54%
Investment, Identifier [Axis]: AEJV SPV LP Membership Interest | Affiliated Issuer    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 0  
Gross Additions 738,725,000  
Gross Reductions 47,051,000  
Net realized gains/(losses) 0  
Net unrealized gains/(losses) 402,000  
Fair value, ending balance 692,076,000 $ 0
Dividend and Interest Income 10,328,000  
Investment, Identifier [Axis]: AEJV SPV LP Membership Interest, Common equity | Affiliated Issuer    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [1],[2],[3],[4] 692,076,000  
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 18,718,000  
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [5] 2,494,000  
Fair value, ending balance [5]   2,494,000
Investment, Identifier [Axis]: AL GCX Holdings, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 19,244,000  
Investment, Identifier [Axis]: AL GCX Holdings, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 12,008,000  
Fair value, ending balance   12,008,000
Investment, Identifier [Axis]: AL NGPL Holdings, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 2,698,000  
Investment, Identifier [Axis]: Acrisure, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 495,000  
Fair value, ending balance   495,000
Investment, Identifier [Axis]: Alpha Generation LLC | First lien senior secured loans 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 20,390,000  
Investment, Identifier [Axis]: Alpha Generation LLC | First lien senior secured loans 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 15,005,000  
Investment, Identifier [Axis]: Alpha Generation LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 10,285,000  
Fair value, ending balance   10,285,000
Investment, Identifier [Axis]: Applied Systems, Inc. , First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 2,552,000  
Fair value, ending balance   2,552,000
Investment, Identifier [Axis]: Aspen Renewables Equity Holdings LLC | Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4] 487,701,000  
Investment, Identifier [Axis]: Aspen Renewables Equity Holdings LLC, Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [6],[7],[8] 479,667,000  
Fair value, ending balance [6],[7],[8]   479,667,000
Investment, Identifier [Axis]: Astoria Energy LLC | First lien senior secured loans 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 20,470,000  
Investment, Identifier [Axis]: Astoria Energy LLC | First lien senior secured loans 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 13,643,000  
Investment, Identifier [Axis]: Astoria Energy LLC, First lien senior secured loans 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 7,035,000  
Fair value, ending balance   7,035,000
Investment, Identifier [Axis]: Astoria Energy LLC, First lien senior secured loans 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 2,135,000  
Fair value, ending balance   2,135,000
Investment, Identifier [Axis]: BCP Renaissance Parent L.L.C., First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 8,909,000  
Fair value, ending balance   8,909,000
Investment, Identifier [Axis]: Bayonne Energy Center, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 17,620,000  
Investment, Identifier [Axis]: Bayonne Energy Center, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 9,165,000  
Fair value, ending balance   9,165,000
Investment, Identifier [Axis]: Blackfin Pipeline LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 7,486,000  
Investment, Identifier [Axis]: Blackfin Pipeline LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 6,005,000  
Fair value, ending balance   6,005,000
Investment, Identifier [Axis]: Buckeye Partners LP | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 3,959,000  
Investment, Identifier [Axis]: Buckeye Partners LP, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 4,011,000  
Fair value, ending balance   4,011,000
Investment, Identifier [Axis]: CMH01 Holdings LP | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4],[9] 150,279,000  
Investment, Identifier [Axis]: CMH01 Holdings LP, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [8],[10] 77,179,000  
Fair value, ending balance [8],[10]   77,179,000
Investment, Identifier [Axis]: CPPIB OVM Member U.S. LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 18,756,000  
Investment, Identifier [Axis]: CPPIB OVM Member U.S. LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 2,295,000  
Fair value, ending balance   2,295,000
Investment, Identifier [Axis]: CPV Fairview, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 29,063,000  
Investment, Identifier [Axis]: CPV Fairview, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 6,021,000  
Fair value, ending balance   6,021,000
Investment, Identifier [Axis]: CW Nest Property Owner LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4],[9] 80,451,000  
Investment, Identifier [Axis]: CW Nest Property Owner LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [8],[10] 14,591,000  
Fair value, ending balance [8],[10]   14,591,000
Investment, Identifier [Axis]: Calpine Construction Finance Company, L.P. , First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 6,357,000  
Fair value, ending balance   6,357,000
Investment, Identifier [Axis]: Calpine Construction Finance Company, L.P. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 6,351,000  
Investment, Identifier [Axis]: Carroll County Energy LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 24,534,000  
Investment, Identifier [Axis]: Carroll County Energy LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 17,021,000  
Fair value, ending balance   17,021,000
Investment, Identifier [Axis]: Cloud Software Group, Inc. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 3,505,000  
Investment, Identifier [Axis]: Cloud Software Group, Inc., First lien snior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 3,988,000  
Fair value, ending balance   3,988,000
Investment, Identifier [Axis]: Cogentrix Finance Holdco I, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 12,612,000  
Investment, Identifier [Axis]: Cogentrix Finance Holdco I, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 11,684,000  
Fair value, ending balance   11,684,000
Investment, Identifier [Axis]: Colossus AcquireCo LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 19,117,000  
Investment, Identifier [Axis]: Colossus AcquireCo LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 10,535,000  
Fair value, ending balance   10,535,000
Investment, Identifier [Axis]: Commonwealth LNG Intermediate Parent, LLC | Preferred equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4] 1,047,597,000  
Investment, Identifier [Axis]: ConnectWise, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 3,864,000  
Investment, Identifier [Axis]: ConnectWise, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 4,878,000  
Fair value, ending balance   4,878,000
Investment, Identifier [Axis]: Coreweave Financing DDTL V, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 31,749,000  
Investment, Identifier [Axis]: Coreweave Financing DDTL V-V, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [9],[11] 24,210,000  
Investment, Identifier [Axis]: Cornerstone Generation, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 8,807,000  
Fair value, ending balance   8,807,000
Investment, Identifier [Axis]: Corporate bonds    
% of Net Assets 0.77%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance $ 59,122,000  
Investment, Identifier [Axis]: Covanta Holding Corporation | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 4,467,000  
Investment, Identifier [Axis]: Covanta Holding Corporation, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 4,500,000  
Fair value, ending balance   $ 4,500,000
Investment, Identifier [Axis]: Denali Equity Holdings LLC    
% of Net Assets 110.69% 120.43%
% of Total Assets 77.74% 73.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 2,522,500,000  
Fair value, ending balance 8,551,600,000 $ 2,522,500,000
Investment, Identifier [Axis]: Denali Equity Holdings LLC | Other equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4] 352,779,000  
Investment, Identifier [Axis]: Denali Equity Holdings LLC, Other equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [6],[7],[8] 354,399,000  
Fair value, ending balance [6],[7],[8]   354,399,000
Investment, Identifier [Axis]: EFS Cogen Holdings I LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 4,165,000  
Fair value, ending balance   4,165,000
Investment, Identifier [Axis]: ELK Grove Village Property LLC | Corporate bonds    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4] 29,400,000  
Investment, Identifier [Axis]: EMG Utica Midstream Holdings, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4] $ 5,500,000  
Investment, Identifier [Axis]: ET Rover Pipeline LLC |Common equity    
% of Net Assets 20.45%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4] $ 1,580,270,000  
Investment, Identifier [Axis]: Ellucian Holdings Inc. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 6,836,000  
Investment, Identifier [Axis]: Ellucian Holdings Inc., First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 7,055,000  
Fair value, ending balance   7,055,000
Investment, Identifier [Axis]: EnergySolutions, LLC | First lien senior secured loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 14,049,000  
Investment, Identifier [Axis]: First American U.S. Treasury Sweep (Y Shares)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 4,755,000  
Investment, Identifier [Axis]: First American U.S. Treasury Sweep (Y Shares) 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 173,000  
Fair value, ending balance 46,000 173,000
Investment, Identifier [Axis]: First American U.S. Treasury Sweep (Y Shares) 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 174,000  
Fair value, ending balance   $ 174,000
Investment, Identifier [Axis]: First lien senior secured loans    
% of Net Assets 18.72% 24.27%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 508,273,000  
Fair value, ending balance 1,446,172,000 $ 508,273,000
Investment, Identifier [Axis]: Freeport LNG Investments, LLLP | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 59,390,000  
Investment, Identifier [Axis]: Freeport LNG investments, LLLP, First lien senior secured loans 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 3,477,000  
Fair value, ending balance   3,477,000
Investment, Identifier [Axis]: Freeport LNG investments, LLLP, First lien senior secured loans 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 8,185,000  
Fair value, ending balance   8,185,000
Investment, Identifier [Axis]: GIP Pilot Acquisition Partners, L.P. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 11,981,000  
Investment, Identifier [Axis]: GIP Pilot Acquisition Partners, L.P., First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 5,005,000  
Fair value, ending balance   5,005,000
Investment, Identifier [Axis]: Galaxy Helios LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4],[9] 91,180,000  
Investment, Identifier [Axis]: Galaxy Helios LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [8],[10] 58,963,000  
Fair value, ending balance [8],[10]   58,963,000
Investment, Identifier [Axis]: Hamilton Projects Acquiror, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 18,522,000  
Investment, Identifier [Axis]: Hamilton Projects Acquiror, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 5,363,000  
Fair value, ending balance   5,363,000
Investment, Identifier [Axis]: Hill Top Energy Center, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 54,144,000  
Investment, Identifier [Axis]: Hill Top Energy Center, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 11,945,000  
Fair value, ending balance   11,945,000
Investment, Identifier [Axis]: ITT Holdings LLC | Corporate bonds    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 3,436,000  
Investment, Identifier [Axis]: ITT Holdings LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 12,948,000  
Investment, Identifier [Axis]: ITT Holdings LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 1,748,000  
Fair value, ending balance   1,748,000
Investment, Identifier [Axis]: Independent power and renewable electricity producers | Corporate bonds    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 5,822,000  
Investment, Identifier [Axis]: Invenergy Thermal Operating I LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 4,409,000  
Investment, Identifier [Axis]: Invenergy Thermal Operating I LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 4,830,000  
Fair value, ending balance   4,830,000
Investment, Identifier [Axis]: Isotope FinCo S.a r.l. | First lien senior secured loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4],[11] 6,000,000  
Investment, Identifier [Axis]: Jackson Generation, LLC | First lien senior secured loans 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 47,203,000  
Investment, Identifier [Axis]: Jackson Generation, LLC | First lien senior secured loans 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 5,479,000  
Investment, Identifier [Axis]: Kodiak Gas Services, LLC | Corporate bonds 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 6,258,000  
Investment, Identifier [Axis]: Kodiak Gas Services, LLC | Corporate bonds 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 5,311,000  
Investment, Identifier [Axis]: Lackawanna Energy Center LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 32,535,000  
Investment, Identifier [Axis]: Lackawanna Energy Center LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 12,971,000  
Fair value, ending balance   12,971,000
Investment, Identifier [Axis]: Lightning Power, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 5,863,000  
Investment, Identifier [Axis]: Lightning Power, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [5] 2,926,000  
Fair value, ending balance [5]   2,926,000
Investment, Identifier [Axis]: M6 ETX Holdings II Midco LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 11,525,000  
Fair value, ending balance   11,525,000
Investment, Identifier [Axis]: MS FLNGI Owner Holdco, LLC | Senior subordinated loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4] 196,000,000  
Investment, Identifier [Axis]: Meade Pipeline Co LLC | Affiliated Issuer    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 214,956,000 0
Gross Additions 9,451,000 202,888,000
Gross Reductions 2,509,000 0
Net realized gains/(losses) 0 0
Net unrealized gains/(losses) 1,020,000 12,068,000
Fair value, ending balance 222,918,000 214,956,000
Dividend and Interest Income 20,769,000 0
Investment, Identifier [Axis]: Meade Pipeline Co LLC, Common equity | Affiliated Investment    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [6],[7],[8] 214,956,000  
Fair value, ending balance [6],[7],[8]   214,956,000
Investment, Identifier [Axis]: Meade Pipeline Co LLC, Common equity | Affiliated Issuer    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [1],[2],[3],[4] 222,918,000  
Investment, Identifier [Axis]: Meridiam North America Core Infrastructure Fund I (Domestic), LP | Other equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[11] 596,659,000  
Investment, Identifier [Axis]: NRG Energy Inc | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 3,966,000  
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 8,446,000  
Fair value, ending balance   8,446,000
Investment, Identifier [Axis]: Par Petroleum LLC / Par Petroleum Finance Corp, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 2,001,000  
Fair value, ending balance   2,001,000
Investment, Identifier [Axis]: Pasadena Performance Products, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 5,399,000  
Investment, Identifier [Axis]: Pasadena Performance Products, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 3,884,000  
Fair value, ending balance   3,884,000
Investment, Identifier [Axis]: Pathfinder Power, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 49,659,000  
Investment, Identifier [Axis]: Pinnacle Buyer, LLC | First lien senior secured loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [9] 8,388,000  
Investment, Identifier [Axis]: Pioneer JV Holdings LLC | Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[9] 758,886,000  
Investment, Identifier [Axis]: Pioneer JV Holdings LLC, Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [6],[7],[8],[10] 753,613,000  
Fair value, ending balance [6],[7],[8],[10]   753,613,000
Investment, Identifier [Axis]: Potomac Energy Center, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 47,852,000  
Investment, Identifier [Axis]: Potomac Energy Center, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 12,449,000  
Fair value, ending balance   12,449,000
Investment, Identifier [Axis]: PowerHouse Data LCX, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4],[9] 55,320,000  
Investment, Identifier [Axis]: PowerHouse Data LCX, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [8],[10] 14,440,000  
Fair value, ending balance [8],[10]   14,440,000
Investment, Identifier [Axis]: Prairie ECI Acquiror LP | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 14,772,000  
Investment, Identifier [Axis]: Prairie ECI Acquiror LP, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 8,867,000  
Fair value, ending balance   8,867,000
Investment, Identifier [Axis]: Project Ruby Ultimate Parent Corp, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 6,839,000  
Fair value, ending balance   6,839,000
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC | First lien senior secured loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [9] 15,128,000  
Investment, Identifier [Axis]: QTS Thunder Managing Issuer, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 25,631,000  
Investment, Identifier [Axis]: Ravens Edge Renewables, LLC | Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[9] 441,605,000  
Investment, Identifier [Axis]: Redwood Meade Midstream MPC, LLC | Affiliated Issuer    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 37,589,000 0
Gross Additions 1,668,000 35,459,000
Gross Reductions 397,000 0
Net realized gains/(losses) 0 0
Net unrealized gains/(losses) 134,000 2,130,000
Fair value, ending balance 38,994,000 37,589,000
Dividend and Interest Income 2,184,000 0
Investment, Identifier [Axis]: Redwood Meade Midstream MPC, LLC, Common equity | Affiliated Investment    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [6],[7],[8] 37,589,000  
Fair value, ending balance [6],[7],[8]   37,589,000
Investment, Identifier [Axis]: Redwood Meade Midstream MPC, LLC, Common equity | Affiliated Issuer    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [1],[2],[3],[4] 38,994,000  
Investment, Identifier [Axis]: Resilience Parent, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 31,468,000  
Investment, Identifier [Axis]: Retained Vantage Data Centers Intermediate Holdco, L.P, Senior subordinated loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [7],[8],[10] 35,304,000  
Fair value, ending balance [7],[8],[10]   35,304,000
Investment, Identifier [Axis]: Retained Vantage Data Centers Intermediate Holdco, L.P. | Senior subordinated loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4],[9] 185,000,000  
Investment, Identifier [Axis]: Rosen International S.a r.l. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 26,236,000  
Investment, Identifier [Axis]: SCIH Salt Holdings Inc. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 39,147,000  
Investment, Identifier [Axis]: SCIH Salt Holdings Inc., First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 7,511,000  
Fair value, ending balance   $ 7,511,000
Investment, Identifier [Axis]: SI SNM01A Aggregator LLC | Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[9] 186,667,000  
Investment, Identifier [Axis]: SI SNM01B Aggregator JV LLC | Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[9] 607,170,000  
Investment, Identifier [Axis]: Saber Power Services, LLC | First lien senior secured loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [9] $ 4,630,000  
Investment, Identifier [Axis]: Senior subordinated loans    
% of Net Assets 6.59% 4.28%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 89,618,000  
Fair value, ending balance 510,064,000 $ 89,618,000
Investment, Identifier [Axis]: Sierra Equity Holdings LLC | Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[9] 499,710,000  
Investment, Identifier [Axis]: Sierra Equity Holdings LLC, Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [6],[7],[8],[10] 155,587,000  
Fair value, ending balance [6],[7],[8],[10]   155,587,000
Investment, Identifier [Axis]: South Field Energy LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 37,940,000  
Investment, Identifier [Axis]: South Field Energy LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 11,006,000  
Fair value, ending balance   11,006,000
Investment, Identifier [Axis]: Stack SJ Holdings Parent A-I, LLC | Senior subordinated loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4],[9] 129,064,000  
Investment, Identifier [Axis]: Stack SJ Holdings Parent A-I, LLC, Senior subordinated loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [7],[8],[10] 54,314,000  
Fair value, ending balance [7],[8],[10]   54,314,000
Investment, Identifier [Axis]: Summit Midstream Holdings LLC | Corporate bonds    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 2,040,000  
Investment, Identifier [Axis]: Sunrun Acropolis Owner 2026, LLC | Other equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[9] 38,158,000  
Investment, Identifier [Axis]: Talen Energy Supply LLC , First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [5] 11,454,000  
Fair value, ending balance [5]   11,454,000
Investment, Identifier [Axis]: Tango Holdings LLC, Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [6],[7],[8],[10] 526,684,000  
Fair value, ending balance [6],[7],[8],[10]   526,684,000
Investment, Identifier [Axis]: Tango Holdings, LLC | Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[9] 775,406,000  
Investment, Identifier [Axis]: TerraForm Power Operating, LLC , First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 3,482,000  
Fair value, ending balance   3,482,000
Investment, Identifier [Axis]: Tiger Acquisition, LLC | First lien senior secured loans 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 25,663,000  
Investment, Identifier [Axis]: Tiger Acquisition, LLC | First lien senior secured loans 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 4,735,000  
Investment, Identifier [Axis]: TransMontaigne Operating Company L.P. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 26,658,000  
Investment, Identifier [Axis]: TransMontaigne Operating Company L.P., First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 13,591,000  
Fair value, ending balance   13,591,000
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 8,258,000  
Fair value, ending balance   8,258,000
Investment, Identifier [Axis]: Trilon Group, LLC | First lien senior secured loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 6,165,000  
Investment, Identifier [Axis]: USA Compression Partners LP / USA Compression Finance Corp | Corporate bonds 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 3,528,000  
Investment, Identifier [Axis]: USA Compression Partners LP / USA Compression Finance Corp | Corporate bonds 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 3,327,000  
Investment, Identifier [Axis]: Venture Global | First lien senior secured loans 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 10,459,000  
Investment, Identifier [Axis]: Venture Global | First lien senior secured loans 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [11] 4,009,000  
Investment, Identifier [Axis]: Venture Global | First lien senior secured loans 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [4],[11] 1,311,000  
Investment, Identifier [Axis]: Venture Global, First lien senior secured loans 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [5] 1,568,000  
Fair value, ending balance [5]   1,568,000
Investment, Identifier [Axis]: Venture Global, First lien senior secured loans 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance [5],[8] 196,000  
Fair value, ending balance [5],[8]   196,000
Investment, Identifier [Axis]: Voyager JV Holdings LLC | Common equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance [2],[3],[4],[9] 224,981,000  
Investment, Identifier [Axis]: WEC US Holdings Inc. | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 36,141,000  
Investment, Identifier [Axis]: WEC US Holdings Inc., First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 6,182,000  
Fair value, ending balance   6,182,000
Investment, Identifier [Axis]: WhiteWater Matterhorn Holdings, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 22,844,000  
Investment, Identifier [Axis]: WhiteWater Matterhorn Holdings, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance 3,560,000  
Fair value, ending balance   3,560,000
Investment, Identifier [Axis]: WhiteWater Whistler Holdings, LLC | First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, ending balance 18,421,000  
Investment, Identifier [Axis]: WhiteWater Whistler Holdings, LLC, First lien senior secured loans    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value, beginning balance $ 13,431,000  
Fair value, ending balance   $ 13,431,000
[1] As defined in the Investment Company Act, the Fund is deemed both to be an “Affiliated Person” and to “Control” this portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). For the nine months ended September 30, 2026, the Fund’s controlled/affiliated investments were as follows:
Company
Fair value as of December 31, 2025
Gross AdditionsGross ReductionsNet realized gains/(losses)Net unrealized gains/(losses)
Fair value as of September 30, 2026
Dividend and Interest Income
Meade Pipeline Co LLC$214,956 $9,451 $2,509 $— $1,020 $222,918 $20,769 
Redwood Meade Midstream MPC, LLC37,589 1,668 397 — 134 38,994 2,184 
AEJV SPV LP Membership Interest— 738,725 47,051 — 402 692,076 10,328 
$252,545 $749,844 $49,957 $— $1,556 $953,988 $33,281 
[2] Securities exempt from registration under the Securities Act of 1933, as amended (the “1933 Act”) and may be deemed “restricted securities” subject to legal restrictions on sales. As of September 30, 2026, the aggregate fair value of these securities is $8,551.6 million, which represents 110.69% of the Fund’s (as defined below) net assets or 77.74% of the Fund’s total assets.
[3] These assets are pledged as collateral under the Fund’s or the Fund’s consolidated subsidiaries’ various credit facilities and, as a result, are not directly available to the creditors of the Fund to satisfy any obligations of the Fund other than the obligations under each of the respective credit facilities (see “Note 5. Debt” to the unaudited consolidated financial statements for more information).
[4] These investments were valued using significant unobservable inputs and are considered Level 3 investments. See “Note 8. Fair Value of Financial Instruments” to the unaudited consolidated financial statements for more information regarding the fair value of the Fund’s investments.
[5] This portfolio company is not a qualifying asset under Section 55(a) of the 1940 Act. Under the 1940 Act, the Fund may not acquire any non-qualifying asset unless, at the time such acquisition is made, qualifying assets represent at least 70% of the Fund's total assets. Pursuant to Section 55(a) of the 1940 Act, 0.54% of the Fund’s total assets are represented by investments at fair value and other assets that are considered “non-qualifying assets” as of December 31, 2025.
[6] Securities exempt from registration under the 1933 Act and may be deemed “restricted securities” subject to legal restrictions on sales. As of December 31, 2025, the aggregate fair value of these securities is $2,522.5 million, which represents 120.43% of the Fund’s net assets or 73.01% of the Fund’s total assets.
[7] These assets are pledged as collateral under the Fund’s or the Fund’s consolidated subsidiaries’ various credit facilities and, as a result, are not directly available to the creditors of the Fund to satisfy any obligations of the Fund other than the obligations under each of the respective credit facilities (see “Note 5. Debt” to the unaudited consolidated financial statements for more information).
[8] These investments were valued using significant unobservable inputs and are considered Level 3 investments. See “Note 8. Fair Value of Financial Instruments” to the unaudited consolidated financial statements for more information regarding the fair value of the Fund’s investments.
[9] As of September 30, 2026, the Fund had commitments to fund various delayed draw term loans and equity investments. Such commitments are subject to the satisfaction of certain conditions set forth in the documents governing these loans and there can be no assurance that such conditions will be satisfied. See “Note 7. Commitments and Contingencies” to the unaudited consolidated financial statements for more information on delayed draw term loan commitments related to certain portfolio companies. Principal reflects the funded principal as of September 30, 2026.
[10] As of December 31, 2025, the Fund had commitments to fund various delayed draw term loans and equity investments. Such commitments are subject to the satisfaction of certain conditions set forth in the documents governing these loans and there can be no assurance that such conditions will be satisfied. See “Note 7. Commitments and Contingencies” to the unaudited consolidated financial statements for more information on delayed draw term loan commitments related to certain portfolio companies.
[11] This portfolio company is not a qualifying asset under Section 55(a) of the Investment Company Act of 1940, as amended (together with the rules and regulations promulgated thereunder, the “1940 Act”). Under the 1940 Act, the Fund may not acquire any non-qualifying asset unless, at the time such acquisition is made, qualifying assets represent at least 70% of the Fund’s total assets. Pursuant to Section 55(a) of the 1940 Act, 6.68% of the Fund’s total assets are represented by investments at fair value and other assets that are considered “non-qualifying assets” as of September 30, 2026.