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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income (loss) attributable to Mosaic $ 156.7 $ (203.0)
Basic weighted average number of shares outstanding 379.2 378.8
Dilutive impact of share-based awards 3.6 0.0
Diluted weighted average number of shares outstanding 382.8 378.8
Basic net earnings (loss) per share attributable to Mosaic $ 0.41 $ (0.54)
Diluted net earnings (loss) per share attributable to Mosaic $ 0.41 $ (0.54)
Shares subject to issuance upon exercise of stock options excluded from the calculation of diluted earnings per share 0.7 2.5