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Business Segments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Net sales | $ 1,240.3 | $ 1,408.8 | $ 3,429.0 | $ 4,421.9
Cost of product sold (exclusive of depreciation and amortization) | 1,005.7 | 1,076.7 | 2,719.3 | 3,342.5
Intersegment elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1.7) | (2.1) | (4.3) | (14.9)
Cost of product sold (exclusive of depreciation and amortization) | (1.7) | (1.5) | (4.6) | (14.0)
Intersegment elimination | Petroleum |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 0.4 | 1.7 | 1.3 | 5.9
Cost of product sold (exclusive of depreciation and amortization) | 1.2 | 0.5 | 2.9 | 9.0
Intersegment elimination | Nitrogen Fertilizer |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1.2 | 0.5 | 2.9 | 9.0
Cost of product sold (exclusive of depreciation and amortization) | $ 0.5 | $ 1.1 | $ 1.7 | $ 5.0

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