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Business Segments (Details 1) $ in Millions | 3 Months Ended | 12 Months Ended
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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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