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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Net income attributable to Mosaic $ 841.7 $ 371.9 $ 3,059.6 $ 965.8
Basic weighted average number of shares outstanding 344.2 379.8 356.5 379.6
Dilutive impact of share-based awards 3.5 3.4 3.6 3.4
Diluted weighted average number of shares outstanding 347.7 383.2 360.1 383.0
Basic net earnings per share attributable to Mosaic $ 2.45 $ 0.98 $ 8.58 $ 2.54
Diluted net earnings per share attributable to Mosaic $ 2.42 $ 0.97 $ 8.50 $ 2.52
Shares subject to issuance upon exercise of stock options excluded from the calculation of diluted earnings per share 0.1 0.5 0.1 0.5
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares subject to issuance upon exercise of stock options excluded from the calculation of diluted earnings per share 0.1 0.5 0.1 0.5
Debt securities        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Debt Securities, Available-for-sale, Realized Gain $ 0.1 $ 0.9 $ 0.3 $ 5.3