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Commitments and Contingencies - Investments in Affiliates and Other Entities (Detail) $ in Millions	57 Months Ended
	Sep. 30, 2018 USD ($)	May 31, 2022 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2014 kV substation km
Capital for Infrastructure Projects
Other Commitments [Line Items]
Outstanding capital commitment	$ 80.0
Planned Oil and Gas Infrastructure Projects
Other Commitments [Line Items]
Outstanding capital commitment	14.8
Planned Oil and Gas Infrastructure Projects | Forecast
Other Commitments [Line Items]
Outstanding capital commitment		$ 0.8		$ 14.0
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	65.0
Proceeds from return of capital	62.7
EPC Electric Transmission Project | Forecast
Other Commitments [Line Items]
Outstanding capital commitment			$ 24.5
Infrastructure Investors Partnership | Capital for Infrastructure Projects
Other Commitments [Line Items]
Outstanding capital commitment	$ 1,000.0

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- Definition

Length of transmission line.

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Number of Substations

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Voltage Of Substations

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21D
-URI http://asc.fasb.org/extlink&oid=109223946&loc=SL94080555-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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