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Business Segments (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) segment | Jun. 30, 2014 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 1,624.2 | $ 2,540.3 | $ 3,013.1 | $ 4,987.8
Cost of product sold (exclusive of depreciation and amortization) | 1,192.2 | 2,189.0 | 2,265.8 | 4,265.9
Intersegment elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (4.1) | (3.2) | (12.8) | (11.4)
Cost of product sold (exclusive of depreciation and amortization) | (4.1) | (3.0) | (12.5) | (11.2)
Intersegment elimination | Petroleum |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 2.1 | 2.3 | 4.2 | 4.6
Cost of product sold (exclusive of depreciation and amortization) | 2.0 | 0.9 | 8.5 | 6.8
Intersegment elimination | Nitrogen Fertilizer |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 2.0 | 0.9 | 8.5 | 6.8
Cost of product sold (exclusive of depreciation and amortization) | $ 2.1 | $ 2.2 | $ 3.9 | $ 4.5

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