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Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) customer	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Basis of Consolidation
Percentage of holders of the outstanding common units required to vote for removal of the general partner	66.67%
Cash and Cash Equivalents
Checks issued but not presented to banks	$ 18.1	$ 24.7
Inventory, Net [Abstract]
Lower of FIFO cost or market inventory adjustment			$ 36.8
Accounts receivable | Credit concentration
Accounts Receivable, net
Number of customers | customer	1
Customers individually representing greater than this percentage for disclosure	10.00%	9.00%

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Represents the amount of checks issued but not presented to banks.

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Represents the minimum percentage of voting by the holders of outstanding common units required for removal of the general partner.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
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