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Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]      
Beginning balance $ 1,173.0 $ 1,156.9  
Goodwill, Foreign Currency Translation Gain (Loss) (0.8) 16.1  
Ending balance 1,172.2 1,173.0 $ 1,156.9
Goodwill, Impairment Loss 0.0 0.0 588.6
Goodwill determined to be tax deductible 3.0    
Potash Segment      
Goodwill [Line Items]      
Beginning balance 1,063.2 1,039.8  
Goodwill, Foreign Currency Translation Gain (Loss) 1.0 23.4  
Ending balance 1,064.2 1,063.2 1,039.8
Mosaic Fertilizantes      
Goodwill [Line Items]      
Beginning balance 97.7 105.0  
Goodwill, Foreign Currency Translation Gain (Loss) (1.8) (7.3)  
Ending balance 95.9 97.7 105.0
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 12.1
Phosphates Segment      
Goodwill [Line Items]      
Goodwill, Impairment Loss     $ 588.6
Minimum      
Goodwill [Line Items]      
Terminal Value Growth Rate 2.00%