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Share Repurchases	12 Months Ended
	Dec. 31, 2018
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. As of December 31, 2018, 15,765,025 shares of Common Stock have been repurchased under the 2015 Repurchase Program for an aggregate total of approximately $650 million. The remaining amount that could be repurchased under this program was $850 million as of December 31, 2018. 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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No definition available.

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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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