Long-Term Obligations and Notes Payable Lines of Credit Narrative (Details) - USD ($) $ in Millions			12 Months Ended
		May. 06, 2014	Dec. 31, 2015	Dec. 31, 2014	Jun. 26, 2014
Debt Instrument [Line Items]
Debt and Capital Lease Obligations			$ 975.7	$ 587.3
Debt and capital lease obligations			981.1
MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations			118.3
Wells Term Loan [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations			40.8
Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations			17.0
Revolving Credit Facility [Member] | Secured Debt [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal			5.8
Revolving Credit Facility [Member] | Line of Credit [Member] | MAPCO Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 160.0
Maximum Borrowing Capacity under Accordion Feature		50.0
Debt and Capital Lease Obligations			118.3	76.0
Line of Credit Facility, Remaining Borrowing Capacity			38.7
Related Party Limiited Guaranty of Debt			$ 50.0
Debt, Weighted Average Interest Rate			2.64%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.25%
Revolving Credit Facility [Member] | Line of Credit [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 600.0
Maximum Borrowing Capacity under Accordion Feature			875.0
Line of Credit Facility, Remaining Borrowing Capacity			$ 89.2
Debt, Weighted Average Interest Rate			4.17%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.38%
Delayed single draw term loan			$ 70.0
Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations			351.6	251.8
Debt and capital lease obligations			351.6
Revolving Credit Facility [Member] | Line of Credit [Member] | Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 17.0
Debt and Capital Lease Obligations			17.0	17.0
Line of Credit Facility, Remaining Borrowing Capacity			$ 0.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.50%
Debt Instrument, Interest Rate, Stated Percentage			5.25%
Term loan facility [Member] | Secured Debt [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	[1]		$ 40.6	$ 63.8
Debt and capital lease obligations			40.8
Revolving Credit Facility, Swing Line Loan [Member] | Line of Credit [Member] | MAPCO Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		10.0
Revolving Credit Facility, Swing Line Loan [Member] | Line of Credit [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			55.0
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			98.4
Letter of Credit [Member] | Line of Credit [Member] | MAPCO Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 40.0
Letters of Credit Outstanding, Amount			3.0
Letter of Credit [Member] | Line of Credit [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			550.0
Letters of Credit Outstanding, Amount			$ 91.5
Base Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		base rate
Base Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis			base rate
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis			LIBOR
Fifth Third Bank [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 700.0
Maximum Borrowing Capacity under Accordion Feature			800.0
Line of Credit Facility, Remaining Borrowing Capacity			346.9
Related Party Limiited Guaranty of Debt			$ 102.0
Debt, Weighted Average Interest Rate			2.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.40%
Fifth Third Bank [Member] | Letter of Credit [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			$ 1.5
Fifth Third Bank [Member] | Base Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis			U.S. base rate
Fifth Third Bank [Member] | Canadian prime rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis			Canadian prime rate
Fifth Third Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis			LIBOR
Fifth Third Bank [Member] | Canadian Dealer Offered Rate (CDOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis			Canadian Dealer Offered Rate

[1] The Wells Term Loan is net of deferred financing costs of $0.2 million and $0.4 million as of December 31, 2015 and 2014, respectively.