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Business Segments - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Net sales	$ 1,434.4	$ 1,283.2	$ 2,941.5	$ 2,188.7
Cost of materials and other	1,228.6	976.9	2,449.8	1,713.7
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales	(1.7)	(1.0)	(3.4)	(2.6)
Cost of materials and other	(1.5)	(1.0)	(3.4)	(2.9)
Intersegment elimination | Petroleum
Segment Reporting Information [Line Items]
Net sales	(0.8)	(0.5)	(1.2)	(0.9)
Cost of materials and other	0.0	(0.5)	(0.1)	(1.6)
Intersegment elimination | Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Net sales	(0.9)	(0.5)	(2.1)	(1.6)
Cost of materials and other	$ (0.5)	$ (0.5)	$ (1.0)	$ (1.3)

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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=63488584&loc=d3e20235-122688

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