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Acquisition - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 1,593.1 | $ 1,453.8 | $ 1,434.4 | $ 1,507.1 | $ 1,353.4 | $ 1,240.3 | $ 1,283.2 | $ 905.5 | $ 5,988.4 | $ 4,782.4 | $ 5,432.5
Operating loss |  | $ 30.0 | $ 78.9 | $ 1.3 | $ 67.6 | $ 12.9 | $ 27.2 | $ 90.7 | $ (39.9) | $ 177.8 | 90.9 | $ 421.6
East Dubuque Merger |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 127.9 |
Operating loss |  |  |  |  |  |  |  |  |  |  | $ 1.2 |
CVR Nitrogen | East Dubuque Merger |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unit consideration per CVR Nitrogen common unit (in units) | 1.04 |  |  |  |  |  |  |  |  |  |  |
Cash consideration received per outstanding common unit (in dollars per share) | $ 2.57 |  |  |  |  |  |  |  |  |  |  |
CVR Partners, LP | East Dubuque Merger |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 40,200,000 |  |  |  |  |  |  |  |  |  |  |
Cash payment to CVR Nitrogen common unitholders and certain phantom unit holders | $ 99.2 |  |  |  |  |  |  |  |  |  |  |
Aggregate merger consideration | 802.4 |  |  |  |  |  |  |  |  |  |  |
Fair value of common units issued in a business combination | 335.7 |  |  |  |  |  |  |  |  |  |  |
Fair value of debt assumed | $ 367.5 |  |  |  |  |  |  |  |  |  |  |

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