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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]          
Indemnification asset $ 21.4   $ 21.4   $ 40.6
Transactions with non-consolidated companies included in net sales 200.4 $ 273.6 571.5 $ 825.4  
Transactions with non-consolidated companies included in cost of sales 224.2 396.7 619.7 947.5  
Investee          
Related Party Transaction [Line Items]          
Net amount due from our non-consolidated companies 33.7   33.7   23.2
Indemnification asset $ 21.4   $ 21.4   32.5
Beneficial Owner          
Related Party Transaction [Line Items]          
Mosaic's ownership percentage 50.00%   50.00%    
Bridge loans to affiliate $ 74.7   $ 74.7    
Allowance against bridge loans to affiliates 54.2   54.2   $ 54.2
Equity Method Investee          
Related Party Transaction [Line Items]          
Transactions with non-consolidated companies included in net sales $ 1.5 $ 2.4 $ 5.4 $ 7.0  
Percent of joint venture production Mosaic expects to market     25.00%