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Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]    
Goodwill, net of accumulated amortization $ 1,172.2  
Foreign currency translation 24.2  
Goodwill, net of accumulated amortization 1,196.4  
Goodwill, Gross 1,200.0 $ 1,200.0
Potash segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 1,064.2  
Foreign currency translation 19.9  
Goodwill, net of accumulated amortization 1,084.1  
Mosaic Fertilizantes segment    
Goodwill [Line Items]    
Goodwill, net of accumulated amortization 95.9  
Foreign currency translation 4.3  
Goodwill, net of accumulated amortization 100.2  
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