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Commitments and Contingencies - Other Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Connector Construction Provisions
Loss Contingencies [Line Items]
Other commitment	$ 4.2	$ 28.4	$ 33.8
Incidental Connector Construction Provisions
Loss Contingencies [Line Items]
Other commitment	$ 45.8

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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.

+ References

No definition available.

+ Details

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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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

Name:	us-gaap_OtherCommitmentsAxis=dkl_IncidentalConnectorConstructionProvisionsMember
Namespace Prefix:
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Balance Type:
Period Type: