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Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net earnings (loss) attributable to Mosaic	$ 666.1	$ (1,067.4)	$ 470.0
Basic weighted average number of shares outstanding (in shares)	379.0	383.8	384.8
Dilutive impact of share-based awards (in shares)	2.3	0.0	1.6
Diluted weighted average number of shares outstanding (in shares)	381.3	383.8	386.4
Basic net (loss) earnings per share (in usd per share)	$ 1.76	$ (2.78)	$ 1.22
Diluted net (loss) earnings per share (in usd per share)	$ 1.75	$ (2.78)	$ 1.22
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2.3	2.5	2.0

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