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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net earnings (loss) attributable to Mosaic $ 47.4 $ (233.1) $ (155.6) $ (102.3)
Basic weighted average number of shares outstanding 379.1 385.8 378.9 385.7
Dilutive impact of share-based awards 2.2 0.0 0.0 0.0
Diluted weighted average number of shares outstanding 381.3 385.8 378.9 385.7
Basic net earnings (loss) per share attributable to Mosaic $ 0.13 $ (0.60) $ (0.41) $ (0.27)
Diluted net earnings (loss) per share attributable to Mosaic $ 0.12 $ (0.60) $ (0.41) $ (0.27)
Shares subject to issuance upon exercise of stock options excluded from the calculation of diluted earnings per share 3.4 2.9 3.0 2.4