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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 |  |  |

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