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Amended and Restated Credit Agreement (Details) (Revolving Credit Facility [Member], Fifth Third Bank [Member], USD $) In Millions, unless otherwise specified		9 Months Ended			0 Months Ended
	Sep. 30, 2014 Letter of Credit [Member]	Sep. 30, 2014 Line of Credit [Member]	Jul. 09, 2013 Line of Credit [Member]	Nov. 07, 2012 Line of Credit [Member]	Jul. 09, 2013 Line of Credit [Member] London Interbank Offered Rate (LIBOR) [Member] United States of America, Dollars	Jul. 09, 2013 Line of Credit [Member] Canadian prime rate [Member] Canada, Dollars	Jul. 09, 2013 Line of Credit [Member] Prime Rate [Member] United States of America, Dollars	Jul. 09, 2013 Line of Credit [Member] Canadian Dealer Offered Rate (CDOR) [Member] Canada, Dollars
Line of Credit Facility [Line Items]
Maximum Borrowing Capacity			$ 400.0	$ 175.0
Maximum Borrowing Capacity under Accordion Feature			450.0
Debt Instrument, Description of Variable Rate Basis					LIBOR	Canadian dollar prime rate,	U.S. dollar prime rate	Canadian Dealer Offered Rate
Weighted Average Interest Rate		2.40%
Unused Capacity, Commitment Fee Percentage		0.40%
Holdings Note Principal amount outstanding		102.0
Borrowings outstanding	0	230.0
Letters of Credit Outstanding	13.0
Remaining Borrowing Capacity		$ 157.0

X

- Definition

Maximum Borrowing Capacity under Accordion Feature

+ References

No definition available.

+ Details

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Namespace Prefix:	dk_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Related Party Limiited Guaranty of Debt

+ References

No definition available.

+ Details

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Namespace Prefix:	dk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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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X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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X

- Definition

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

+ References

No definition available.

+ Details

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

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

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- Details

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Balance Type:	na
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X

- 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

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

X

- Definition

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

+ 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

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X

- 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.

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