Maximum Borrowing Capacity under Accordion Feature

No definition available.

Name:	dkl_MaximumBorrowingCapacityUnderAccordionFeature
Namespace Prefix:	dkl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Related Party Limiited Guaranty of Debt

+ References

No definition available.

+ Details

Name:	dkl_RelatedPartyLimiitedGuarantyofDebt
Namespace Prefix:	dkl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Amended and Restated Credit Agreement (Details) (Revolving Credit Facility [Member], Fifth Third Bank [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Dec. 30, 2014	Jul. 09, 2013
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Borrowings outstanding	$ 0
Letters of Credit Outstanding	4.5
Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum Borrowing Capacity		700.0	400.0
Maximum Borrowing Capacity under Accordion Feature		800.0
Weighted Average Interest Rate	2.60%
Unused Capacity, Commitment Fee Percentage	0.30%
Holdings Note Principal amount outstanding	102.0
Borrowings outstanding	316.4
Remaining Borrowing Capacity	$ 379.1
Line of Credit [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| United States of America, Dollars
Line of Credit Facility [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
Line of Credit [Member] \| Canadian prime rate [Member] \| Canada, Dollars
Line of Credit Facility [Line Items]
Debt Instrument, Description of Variable Rate Basis		Canadian dollar prime rate,
Line of Credit [Member] \| Prime Rate [Member] \| United States of America, Dollars
Line of Credit Facility [Line Items]
Debt Instrument, Description of Variable Rate Basis		U.S. dollar prime rate
Line of Credit [Member] \| Canadian Dealer Offered Rate (CDOR) [Member] \| Canada, Dollars
Line of Credit Facility [Line Items]
Debt Instrument, Description of Variable Rate Basis		Canadian Dealer Offered Rate