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Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Goodwill, net of accumulated amortization $ 1,116.3  
Foreign currency translation (1.0)  
Goodwill, net of accumulated amortization 1,115.3  
Goodwill, Gross 1,100.0 $ 1,100.0
Potash segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 1,006.6  
Foreign currency translation (2.1)  
Goodwill, net of accumulated amortization 1,004.5  
Mosaic Fertilizantes segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 97.6  
Foreign currency translation 1.1  
Goodwill, net of accumulated amortization 98.7  
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