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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net earnings attributable to Mosaic $ 39.2 $ 160.0 $ 285.9 $ 845.4
Basic weighted average number of shares outstanding 350.1 354.3 350.4 360.5
Dilutive impact of share-based awards 1.4 1.7 1.3 1.8
Diluted weighted average number of shares outstanding 351.5 356.0 351.7 362.3
Basic net earnings per share attributable to Mosaic $ 0.11 $ 0.45 $ 0.82 $ 2.35
Diluted net earnings per share attributable to Mosaic $ 0.11 $ 0.45 $ 0.81 $ 2.33
Shares subject to issuance upon exercise of stock options excluded from the calculation of diluted earnings per share 2.6 1.6 3.0 1.3