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Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Beginning balance $ 1,116.3 $ 1,172.2
Goodwill, Foreign Currency Translation Gain (Loss) 22.3 (55.9)
Ending balance 1,138.6 1,116.3
Goodwill determined to be tax deductible 46.2  
Potash Segment    
Goodwill [Line Items]    
Beginning balance 1,006.6 1,064.2
Goodwill, Foreign Currency Translation Gain (Loss) 20.3 (57.6)
Ending balance 1,026.9 1,006.6
Mosaic Fertilizantes    
Goodwill [Line Items]    
Beginning balance 97.6 95.9
Goodwill, Foreign Currency Translation Gain (Loss) 2.0 1.7
Ending balance 99.6 97.6
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%