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Organization and Nature of Business (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Jan. 08, 2018	Dec. 31, 2017
MWSPC
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage		25.00%
Percentage Of Total Production Expected To Market		25.00%
Miski Mayo Mine
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage				35.00%
Miski Mayo Joint Venture [Member]
Schedule of Equity Method Investments
Business Acquisition, Percentage of Voting Interests Acquired			40.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage			75.00%
Ma'aden Wa'ad Al Shamal Phosphate Company [Member]
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage	25.00%
Percentage Of Total Production Expected To Market	25.00%	25.00%

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Percent of joint venture production Mosaic expects to market

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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-Section 50
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-SubTopic 10
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