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Share Repurchases	12 Months Ended
	Dec. 31, 2020
Share Repurchases [Abstract]
Share Repurchases [Text Block]	SHARE REPURCHASES In May 2015, our Board of Directors authorized a $1.5 billion share repurchase program (the “2015 Repurchase Program”), allowing Mosaic to repurchase shares of our Common Stock through open market purchases, accelerated share repurchase arrangements, privately negotiated transactions or otherwise. The 2015 Repurchase Program has no set expiration date. During the year ended December 31, 2020, no shares of Common Stock were repurchased under the 2015 Repurchase Program. We previously repurchased 22.9 million shares under the 2015 Repurchase Program for an aggregate total of approximately $800 million. The remaining amount that could be repurchased under this program was $700 million as of December 31, 2020. The extent to which we repurchase our shares and the timing of any such repurchases depend on a number of factors, including market and business conditions, the price of our shares, and corporate, regulatory and other considerations.

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Share Repurchases [Abstract]

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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