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Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]    
Beginning balance $ 1,172.2 $ 1,173.0
Goodwill, Foreign Currency Translation Gain (Loss) (55.9) (0.8)
Ending balance 1,116.3 1,172.2
Goodwill determined to be tax deductible 9.3  
Potash Segment    
Goodwill [Line Items]    
Beginning balance 1,064.2 1,063.2
Goodwill, Foreign Currency Translation Gain (Loss) (57.6) 1.0
Ending balance 1,006.6 1,064.2
Mosaic Fertilizantes    
Goodwill [Line Items]    
Beginning balance 95.9 97.7
Goodwill, Foreign Currency Translation Gain (Loss) 1.7 (1.8)
Ending balance 97.6 95.9
Corporate Eliminations And Other Segment    
Goodwill [Line Items]    
Beginning balance 12.1 12.1
Goodwill, Foreign Currency Translation Gain (Loss) 0.0 0.0
Ending balance $ 12.1 $ 12.1
Minimum    
Goodwill [Line Items]    
Terminal Value Growth Rate 2.00%