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Revenue Recognition - Revenue by Product and by Geography (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Net sales $ 1,040.0 $ 870.0 $ 3,297.0 $ 3,031.0
Ammonia        
Disaggregation of Revenue [Line Items]        
Net sales 192.0   778.0  
Granular Urea        
Disaggregation of Revenue [Line Items]        
Net sales 353.0   977.0  
UAN        
Disaggregation of Revenue [Line Items]        
Net sales 270.0   892.0  
AN        
Disaggregation of Revenue [Line Items]        
Net sales 139.0   363.0  
Other        
Disaggregation of Revenue [Line Items]        
Net sales 86.0   287.0  
North America        
Disaggregation of Revenue [Line Items]        
Net sales 760.0   2,639.0  
North America | Ammonia        
Disaggregation of Revenue [Line Items]        
Net sales 148.0   665.0  
North America | Granular Urea        
Disaggregation of Revenue [Line Items]        
Net sales 292.0   901.0  
North America | UAN        
Disaggregation of Revenue [Line Items]        
Net sales 214.0   750.0  
North America | AN        
Disaggregation of Revenue [Line Items]        
Net sales 45.0   139.0  
North America | Other        
Disaggregation of Revenue [Line Items]        
Net sales 61.0   184.0  
Europe and Other        
Disaggregation of Revenue [Line Items]        
Net sales 280.0   658.0  
Europe and Other | Ammonia        
Disaggregation of Revenue [Line Items]        
Net sales 44.0   113.0  
Europe and Other | Granular Urea        
Disaggregation of Revenue [Line Items]        
Net sales 61.0   76.0  
Europe and Other | UAN        
Disaggregation of Revenue [Line Items]        
Net sales 56.0   142.0  
Europe and Other | AN        
Disaggregation of Revenue [Line Items]        
Net sales 94.0   224.0  
Europe and Other | Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 25.0   $ 103.0