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Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Goodwill [Line Items]    
Goodwill, net of accumulated amortization $ 1,061.1  
Foreign currency translation 30.7  
Goodwill, net of accumulated amortization 1,091.8  
Goodwill, Gross 1,100.0 $ 1,100.0
Potash segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 955.4  
Foreign currency translation 27.2  
Goodwill, net of accumulated amortization 982.6  
Mosaic Fertilizantes segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 93.6  
Foreign currency translation 3.5  
Goodwill, net of accumulated amortization 97.1  
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