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Segments - Total Assets for Reportable Segments (Detail) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets		$ 3,314.5	$ 3,277.7
Interest and Other
Segment Reporting Information [Line Items]
Total assets		64.1	67.0
Gathering Opco | Operating Segments
Segment Reporting Information [Line Items]
Total assets		1,846.5	1,844.9
Processing and Storage | Operating Segments
Segment Reporting Information [Line Items]
Total assets	[1]	1,092.2	1,055.1
Terminaling and Export | Operating Segments
Segment Reporting Information [Line Items]
Total assets		$ 311.7	$ 310.7
[1] Includes $110.5 million of investment in equity investees.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
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+ References

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