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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net earnings attributable to Mosaic $ 174.9 $ 1,164.9 $ 3,582.8
Basic weighted average number of shares outstanding (in shares) 319.8 331.3 352.4
Dilutive impact of share-based awards (in shares) 0.9 1.9 3.6
Diluted weighted average number of shares outstanding (in shares) 320.7 333.2 356.0
Basic net (loss) earnings per share (in usd per share) $ 0.55 $ 3.52 $ 10.17
Diluted net (loss) earnings per share (in usd per share) $ 0.55 $ 3.50 $ 10.06
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1.0 0.5 0.1