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Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Goodwill [Line Items]    
Goodwill, net of accumulated amortization $ 1,061.1  
Foreign currency translation 4.0  
Goodwill, net of accumulated amortization 1,065.1  
Goodwill, Gross 1,100.0 $ 1,100.0
Potash segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 955.4  
Foreign currency translation 2.3  
Goodwill, net of accumulated amortization 957.7  
Mosaic Fertilizantes segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 93.6  
Foreign currency translation 1.7  
Goodwill, net of accumulated amortization 95.3  
Corporate, other and intersegment eliminations    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 12.1  
Foreign currency translation 0.0  
Goodwill, net of accumulated amortization $ 12.1