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Business Segments - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Net sales	$ 1,283.2	$ 1,624.2	$ 2,188.7	$ 3,013.1
Cost of product sold (exclusive of depreciation and amortization)	976.9	1,192.2	1,713.7	2,265.8
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales	(1.0)	(4.1)	(2.6)	(12.8)
Cost of product sold (exclusive of depreciation and amortization)	(1.0)	(4.1)	(2.9)	(12.5)
Intersegment elimination | Petroleum
Segment Reporting Information [Line Items]
Net sales	0.5	2.1	0.9	4.2
Cost of product sold (exclusive of depreciation and amortization)	0.5	2.0	1.6	8.5
Intersegment elimination | Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Net sales	0.5	2.0	1.6	8.5
Cost of product sold (exclusive of depreciation and amortization)	$ 0.5	$ 2.1	$ 1.3	$ 3.9

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+ 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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