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Commitments and Contingencies - Other Commitments (Details) $ in Millions | Sep. 30, 2022 USD ($)
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Connector Construction Provisions |
Loss Contingencies [Line Items] |
Other commitment | $ 33.8
Incidental Connector Construction Provisions |
Loss Contingencies [Line Items] |
Other commitment | $ 25.3

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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
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_OtherCommitmentsAxis=dkl_ConnectorConstructionProvisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=dkl_IncidentalConnectorConstructionProvisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |