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Business Segments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Net sales | $ 1,453.8 | $ 1,240.3 | $ 4,395.3 | $ 3,429.0
Cost of materials and other | 1,132.4 | 1,005.7 | 3,582.2 | 2,719.3
Intersegment elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1.4) | (1.7) | (4.8) | (4.3)
Cost of materials and other | (1.4) | (1.7) | (4.8) | (4.6)
Intersegment elimination | Petroleum |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (0.4) | (0.4) | (1.6) | (1.3)
Cost of materials and other | 0.0 | (1.2) | (0.1) | (2.9)
Intersegment elimination | Nitrogen Fertilizer |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (0.9) | (1.2) | (3.0) | (2.9)
Cost of materials and other | $ (0.6) | $ (0.5) | $ (1.6) | $ (1.7)

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + 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(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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