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Segment Disclosures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment data        
Net sales $ 1,040.0 $ 870.0 $ 3,297.0 $ 3,031.0
Cost of sales 867.0 859.0 2,622.0 2,740.0
Gross margin 173.0 11.0 675.0 291.0
Total other operating costs and expenses 42.0 43.0 134.0 154.0
Equity in earnings (loss) of operating affiliates 5.0 (5.0) 30.0 (8.0)
Operating earnings (loss) 136.0 (37.0) 571.0 129.0
Ammonia        
Segment data        
Net sales 192.0   778.0  
Granular Urea        
Segment data        
Net sales 353.0   977.0  
UAN        
Segment data        
Net sales 270.0   892.0  
AN        
Segment data        
Net sales 139.0   363.0  
Operating Segments | Ammonia        
Segment data        
Net sales 192.0 194.0 778.0 865.0
Cost of sales 181.0 203.0 641.0 770.0
Gross margin 11.0 (9.0) 137.0 95.0
Operating Segments | Granular Urea        
Segment data        
Net sales 353.0 228.0 977.0 725.0
Cost of sales 238.0 220.0 682.0 667.0
Gross margin 115.0 8.0 295.0 58.0
Operating Segments | UAN        
Segment data        
Net sales 270.0 243.0 892.0 846.0
Cost of sales 243.0 252.0 731.0 781.0
Gross margin 27.0 (9.0) 161.0 65.0
Operating Segments | AN        
Segment data        
Net sales 139.0 135.0 363.0 372.0
Cost of sales 129.0 123.0 320.0 331.0
Gross margin 10.0 12.0 43.0 41.0
Operating Segments | Other        
Segment data        
Net sales 86.0 70.0 287.0 223.0
Cost of sales 76.0 61.0 248.0 191.0
Gross margin $ 10.0 $ 9.0 $ 39.0 $ 32.0