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Commitments and Contingencies - Investments in Affiliates and Other Entities (Detail) $ in Millions | 12 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2017 USD ($) | May 31, 2022 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2014 kV substation km
Other Commitments, Planned Oil and Gas Infrastructure Projects |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Outstanding capital commitment |  | $ 17.3 |  |  |
Capital for infrastructure projects |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Outstanding capital commitment |  | 80.0 |  |  |
Scenario, Forecast | Other Commitments, Planned Oil and Gas Infrastructure Projects |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Outstanding capital commitment |  |  | $ 16.9 | $ 0.4 |
EPC Electric Transmission Project |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
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 |  | 67.3 |  |  |
Proceeds from return of capital |  | 3.1 |  |  |
EPC Electric Transmission Project | Scenario, Forecast |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Additional aggregate contributions to this unconsolidated affiliate | $ 25.4 |  |  |  |
Infrastructure investors partnership | Capital for infrastructure projects |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Outstanding capital commitment |  | $ 1,000.0 |  |  |

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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