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Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Goodwill, net of accumulated amortization $ 1,138.6  
Foreign currency translation (21.3)  
Goodwill, net of accumulated amortization 1,117.3  
Goodwill, Gross 1,100.0 $ 1,100.0
Potash segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 1,026.9  
Foreign currency translation (18.2)  
Goodwill, net of accumulated amortization 1,008.7  
Mosaic Fertilizantes segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 99.6  
Foreign currency translation (3.1)  
Goodwill, net of accumulated amortization 96.5  
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