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Phosphate Business Disposition (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Phosphate business disposition            
Gain on sale of phosphate business   $ 0.0 $ 0.0 $ 0.0 $ 747.1  
Operating equity method investments | Point Lisas Nitrogen Limited (PLNL)            
Phosphate business disposition            
Share of operating results       50.00%    
Phosphate mining and manufacturing business | Mosaic | Purchase Agreement            
Phosphate business disposition            
Cash consideration received as per definitive agreement $ 1,400.0          
Gain on sale of phosphate business     747.1     $ 750.1
After tax gain on sale of phosphate business     $ 461.0     $ 462.8