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Business Segments - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) segment | Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Net sales | $ 1,434.4 | $ 1,283.2 | $ 2,941.5 | $ 2,188.7
Cost of materials and other | 1,228.6 | 976.9 | 2,449.8 | 1,713.7
Intersegment elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1.7) | (1.0) | (3.4) | (2.6)
Cost of materials and other | (1.5) | (1.0) | (3.4) | (2.9)
Intersegment elimination | Petroleum |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (0.8) | (0.5) | (1.2) | (0.9)
Cost of materials and other | 0.0 | (0.5) | (0.1) | (1.6)
Intersegment elimination | Nitrogen Fertilizer |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (0.9) | (0.5) | (2.1) | (1.6)
Cost of materials and other | $ (0.5) | $ (0.5) | $ (1.0) | $ (1.3)

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