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Business Segments (Details 1) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									2
Net sales	$ 1,010.6	$ 1,408.8	$ 1,624.2	$ 1,388.9	$ 1,841.8	$ 2,279.9	$ 2,540.3	$ 2,447.4	$ 5,432.5	$ 9,109.5	$ 8,985.8
Cost of product sold (exclusive of depreciation and amortization)	$ 847.9	$ 1,076.7	$ 1,192.2	$ 1,073.6	$ 1,733.4	$ 2,066.7	$ 2,189.0	$ 2,076.9	4,190.4	8,066.0	7,563.2
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									(18.6)	(18.9)	(21.4)
Cost of product sold (exclusive of depreciation and amortization)									(18.4)	(19.4)	(21.6)
Intersegment Eliminations | Petroleum
Segment Reporting Information [Line Items]
Net sales									6.8	8.7	9.6
Cost of product sold (exclusive of depreciation and amortization)									11.8	10.1	11.4
Intersegment Eliminations | Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Net sales									11.8	10.1	11.4
Cost of product sold (exclusive of depreciation and amortization)									$ 6.6	$ 9.2	9.8
Intersegment Eliminations | Hydrogen | Petroleum
Segment Reporting Information [Line Items]
Net sales											0.6
Intersegment Eliminations | Hydrogen | Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Cost of product sold (exclusive of depreciation and amortization)											$ 0.6

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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=26872669&loc=d3e20235-122688

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