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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill [Line Items]  
Sensitivity Analysis WACC [Table Text Block] Assuming that all other components of our fair value estimate remain unchanged, a change in the WACC would have the following effect on estimated fair values in excess of carrying values:
Sensitivity Analysis - Percent of Fair Values in Excess of Carrying Values
  Excess at Current WACC  WACC Decreased by 50 Basis Points WACC Decreased by 25 Basis Points WACC Increased by 25 Basis Points WACC Increased by 50 Basis Points
Potash Reporting Unit 20.9% 26.8%23.9%17.8% 14.7%
Goodwill The changes in the carrying amount of goodwill, by reporting unit, as of December 31, 2020 and 2019, are as follows:
(in millions)PhosphatesPotashMosaic FertilizantesCorporate, Eliminations and OtherTotal
Balance as of December 31, 2018$588.6 $1,000.4 $106.4 $12.1 $1,707.5 
Foreign currency translation— 39.4 (1.4)— 38.0 
Impairment(588.6)— — — (588.6)
Balance as of December 31, 2019$— $1,039.8 $105.0 $12.1 $1,156.9 
Foreign currency translation— 23.4 (7.3)— 16.1 
Balance as of December 31, 2020$— $1,063.2 $97.7 $12.1 $1,173.0