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Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Beginning balance $ 1,138.6 $ 1,116.3
Goodwill, Foreign Currency Translation Gain (Loss) (77.5) 22.3
Ending balance 1,061.1 1,138.6
Goodwill determined to be tax deductible 18.6  
Potash Segment    
Goodwill [Line Items]    
Beginning balance 1,026.9 1,006.6
Goodwill, Foreign Currency Translation Gain (Loss) (71.5) 20.3
Ending balance 955.4 1,026.9
Mosaic Fertilizantes    
Goodwill [Line Items]    
Beginning balance 99.6 97.6
Goodwill, Foreign Currency Translation Gain (Loss) (6.0) 2.0
Ending balance 93.6 99.6
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%