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Business Segments (Details 1) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									2
Net sales	$ 1,353.4	$ 1,240.3	$ 1,283.2	$ 905.5	$ 1,010.6	$ 1,408.8	$ 1,624.2	$ 1,388.9	$ 4,782.4	$ 5,432.5	$ 9,109.5
Cost of materials and other	$ 1,128.1	$ 1,005.7	$ 976.9	$ 736.8	$ 847.9	$ 1,076.7	$ 1,192.2	$ 1,073.6	3,847.5	4,190.4	8,066.0
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales									(5.2)	(18.6)	(18.9)
Cost of materials and other									(5.4)	(18.4)	(19.4)
Intersegment elimination | Petroleum
Segment Reporting Information [Line Items]
Net sales									1.8	6.8	8.7
Cost of materials and other									3.2	11.8	10.1
Intersegment elimination | Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Net sales									3.0	11.8	10.1
Cost of materials and other									2.1	$ 6.6	$ 9.2
Intersegment elimination | Hydrogen | Petroleum
Segment Reporting Information [Line Items]
Net sales									$ 0.2

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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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