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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