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Equity-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common units authorized	1,505,000
Partnership Equity-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based employee and directors compensation expense	$ 0.9
Partnership Equity-Based Awards [Member] | GP Purchase [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based employee and directors compensation expense	0.5
CST Equity-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period			47,000
Allocated charge upon accelerated vesting of awards			$ 0.4
CST Equity-Based Awards [Member] | Circle K Omnibus Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based employee and directors compensation expense	$ 0.3	$ 0.3	$ 1.7

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

+ References

No definition available.

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+ References

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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-Publisher FASB
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Number of shares issued under share-based payment arrangement.

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-SubTopic 10
-Section 50
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