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Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting [Abstract] |  |  |  |
Number of reportable segments |  |  | 2 |
Petroleum |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intercompany sales | $ 1.9 | $ 1.6 | $ 6.5 | $ 7.0
Intercompany cost of product sold (exclusive of depreciation and amortization) | 0.1 | 0.8 | 6.9 | 4.7
Petroleum | Hydrogen |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intercompany sales | 0 | 0.3 | 0 | 0.6
Nitrogen Fertilizer |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intercompany sales | 0.1 | 0.8 | 6.9 | 4.7
Intercompany cost of product sold (exclusive of depreciation and amortization) | 2.1 | 2.2 | 6.6 | 7.4
Cost of product sold related to the transfer of excess hydrogen | $ 0 | $ 0.3 | $ 0 | $ 0.6

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- Definition Represents the cost of goods sold related to excessive transfer to other operating segments of the same entity. + References No definition available. + Details
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- Definition Represents the cost of goods sold to other operating segments of the same entity. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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