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Borrowings (Details) - Stonepeak-Plus Infrastructure Fund Master Aggregator LP - USD ($)
Jul. 16, 2025
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Amount outstanding   $ 25,000,000 $ 0
Revolving Credit Facility | Line of Credit      
Debt Instrument [Line Items]      
Line of credit, maximum borrowing capacity $ 100,000,000    
Term 364 days    
Amount outstanding   25,000,000  
Line of credit, remaining borrowing capacity   $ 75,000,000  
Revolving Credit Facility | Line of Credit | SOFR      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.40%    
Revolving Credit Facility | Line of Credit | Reference Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.40%