Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Investments in Affiliates and Other Entities (Details)

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Commitments and Contingencies - Investments in Affiliates and Other Entities (Details)
 63 Months Ended
Mar. 31, 2019
USD ($)
May 31, 2022
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2014
substation
kV
km
Other Commitments [Line Items]        
Contributions to partnership in connection with certain investments and management fees $ 15,100,000      
Capital for Infrastructure Projects        
Other Commitments [Line Items]        
Outstanding capital commitment 80,000,000.0      
Planned Oil and Gas Infrastructure Projects        
Other Commitments [Line Items]        
Outstanding capital commitment 2,300,000      
Planned Oil and Gas Infrastructure Projects | Forecast        
Other Commitments [Line Items]        
Outstanding capital commitment   $ 700,000 $ 1,600,000  
EPC Electric Transmission Project        
Other Commitments [Line Items]        
Outstanding capital commitment 0      
Length of electrical transmission line to be constructed under contract | km       500
Number of substations | substation       2
Voltage of substations | kV       500
Aggregate contributions to this unconsolidated affiliate 88,700,000      
Proceeds from return of capital 60,600,000      
Infrastructure Investors Partnership | Capital for Infrastructure Projects        
Other Commitments [Line Items]        
Outstanding capital commitment $ 1,000,000,000.0