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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Net (loss) attributable to Mosaic $ (6.2) $ (44.1) $ (161.8) $ (146.4)
Basic weighted average number of shares outstanding 379.1 385.0 379.0 385.5
Dilutive impact of share-based awards 0.0 0.0 0.0 0.0
Diluted weighted average number of shares outstanding 379.1 385.0 379.0 385.5
Basic net (loss) per share attributable to Mosaic $ (0.02) $ (0.11) $ (0.43) $ (0.38)
Diluted net (loss) per share attributable to Mosaic $ (0.02) $ (0.11) $ (0.43) $ (0.38)
Shares subject to issuance upon exercise of stock options excluded from the calculation of diluted earnings per share 1.9 2.7 2.4 2.5