v3.26.1
Fair Value Measurements - Investments - Schedule of Quantitative Information (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Infrastructure Assets $ 6,185,617 $ 5,563,528
Level III    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Infrastructure Assets $ 5,972,089 $ 5,382,280
Level III | Weighted Average | Weight Ascribed to Market Comparables    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.017  
Level III | Weighted Average | Weight Ascribed to Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.889  
Level III | Weighted Average | Weight Ascribed to Transaction Price/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.094  
Level III | Weighted Average | Enterprise Value / Forward EBITDA Multiple | Market comparables    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 16.2  
Level III | Weighted Average | Weighted Average Cost of Capital | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.120  
Level III | Weighted Average | Enterprise Value / LTM EBITDA Exit Multiple | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 14.1  
Level III | Minimum | Weight Ascribed to Market Comparables    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.000  
Level III | Minimum | Weight Ascribed to Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.000  
Level III | Minimum | Weight Ascribed to Transaction Price/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.000  
Level III | Minimum | Enterprise Value / Forward EBITDA Multiple | Market comparables    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 11.6  
Level III | Minimum | Weighted Average Cost of Capital | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.063  
Level III | Minimum | Enterprise Value / LTM EBITDA Exit Multiple | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 5.7  
Level III | Maximum | Weight Ascribed to Market Comparables    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.250  
Level III | Maximum | Weight Ascribed to Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 1.000  
Level III | Maximum | Weight Ascribed to Transaction Price/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 1.000  
Level III | Maximum | Enterprise Value / Forward EBITDA Multiple | Market comparables    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 19.0  
Level III | Maximum | Weighted Average Cost of Capital | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 0.256  
Level III | Maximum | Enterprise Value / LTM EBITDA Exit Multiple | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, measurement input 23.8