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Business Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Net sales	$ 1,624.2	$ 2,540.3	$ 3,013.1	$ 4,987.8
Cost of product sold (exclusive of depreciation and amortization)	1,192.2	2,189.0	2,265.8	4,265.9
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales	(4.1)	(3.2)	(12.8)	(11.4)
Cost of product sold (exclusive of depreciation and amortization)	(4.1)	(3.0)	(12.5)	(11.2)
Intersegment elimination | Petroleum
Segment Reporting Information [Line Items]
Net sales	2.1	2.3	4.2	4.6
Cost of product sold (exclusive of depreciation and amortization)	2.0	0.9	8.5	6.8
Intersegment elimination | Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Net sales	2.0	0.9	8.5	6.8
Cost of product sold (exclusive of depreciation and amortization)	$ 2.1	$ 2.2	$ 3.9	$ 4.5

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The aggregate cost of goods produced and sold during the reporting period, excluding depreciation, depletion, and amortization.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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=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

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