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Revenue (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2018
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Provision for (benefit from) income taxes $ 77.1 $ 494.9 $ (74.2)  
Net earnings (loss) attributable to Mosaic 470.0 (107.2) 297.8  
Other current assets 280.6 273.2    
Receivables, net 838.5 642.6   $ 660.8
Inventory, Net 2,270.2 1,547.2   1,533.9
Deferred income taxes 343.8 254.6   253.3
Accrued liabilities 1,092.5 754.4   755.3
Retained earnings 11,064.7 10,631.1   10,633.8
Elimination of Revenue Deferral [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Provision for (benefit from) income taxes (2.1)      
Net earnings (loss) attributable to Mosaic (21.5)      
Other current assets 23.5      
Receivables, net (107.3)      
Inventory, Net 48.1      
Deferred income taxes 3.4      
Accrued liabilities (8.1)      
Retained earnings (24.2)      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Provision for (benefit from) income taxes (3.7)      
Net earnings (loss) attributable to Mosaic (15.0)      
Other current assets (23.5)      
Receivables, net 10.9     18.2
Inventory, Net (5.3)     (13.3)
Deferred income taxes 2.4     (1.3)
Accrued liabilities (3.3)     0.9
Retained earnings $ (12.2)     $ 2.7
Canpotex ASC Topic 606 Adoption Impact [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Sales Volume 450,000      
Provision for (benefit from) income taxes [1] $ 5.8      
Net earnings (loss) attributable to Mosaic [1] 36.5      
Other current assets [1] 0.0      
Receivables, net [1] 96.4      
Inventory, Net [1] (42.8)      
Deferred income taxes [1] (5.8)      
Accrued liabilities [1] 11.4      
Retained earnings [1] 36.4      
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Provision for (benefit from) income taxes 80.8      
Net earnings (loss) attributable to Mosaic 485.0      
Other current assets 304.1      
Receivables, net 827.6      
Inventory, Net 2,275.5      
Deferred income taxes 341.4      
Accrued liabilities 1,095.8      
Retained earnings 11,076.9      
Product        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales 9,587.3 7,409.4 7,162.8  
Cost of goods sold 8,088.9 $ 6,566.6 $ 6,352.8  
Product | Elimination of Revenue Deferral [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales (87.9)      
Cost of goods sold (64.3)      
Product | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales (8.5)      
Cost of goods sold 10.2      
Product | Canpotex ASC Topic 606 Adoption Impact [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales [1] 96.4      
Cost of goods sold [1] 54.1      
Product | Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales 9,595.8      
Cost of goods sold $ 8,078.7      
[1] Includes impact from Canpotex's adoption of new revenue standards, resulting in a deferral of approximately 450,000 tonnes as of December 31, 2018.