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Goodwill (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Goodwill [Line Items]    
Goodwill, net of accumulated amortization $ 1,172.2  
Foreign currency translation (65.9)  
Goodwill, net of accumulated amortization 1,106.3  
Goodwill, Gross 1,100.0 $ 1,200.0
Potash segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 1,064.2  
Foreign currency translation (66.7)  
Goodwill, net of accumulated amortization 997.5  
Mosaic Fertilizantes segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 95.9  
Foreign currency translation 0.8  
Goodwill, net of accumulated amortization 96.7  
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