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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2.0 3.5 3.0
Net earnings (loss) attributable to Mosaic $ 470.0 $ (107.2) $ 297.8
Basic weighted average number of shares outstanding (in shares) 384.8 350.9 350.4
Dilutive impact of share-based awards (in shares) 1.6 0.0 1.3
Diluted weighted average number of shares outstanding (in shares) 386.4 350.9 351.7
Basic net (loss) earnings per share (in usd per share) $ 1.22 $ (0.31) $ 0.85
Diluted net (loss) earnings per share (in usd per share) $ 1.22 $ (0.31) $ 0.85