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Investments in Non-Consolidated Companies - MWSPC Joint Venture (Details) t in Millions, $ in Millions		6 Months Ended	12 Months Ended
	Jul. 01, 2016 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2018 USD ($) t	Dec. 31, 2017 USD ($) financialinstitution	Dec. 31, 2016 USD ($)	Sep. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)
Schedule of Equity Method Investments
Equity in net (loss) earnings of nonconsolidated companies			$ (4.5)	$ 16.7	$ (15.4)
Payments to Acquire Equity Method Investments			0.0	62.5	$ 244.0
Investments in nonconsolidated companies			826.6	1,089.5
Mosaic investment in MWSPC Joint Venture
Schedule of Equity Method Investments
Equity in net (loss) earnings of nonconsolidated companies			$ 9.5	$ 32.0
Payments to Acquire Equity Method Investments	$ 120.0
Percentage Of Total Production Expected To Market			25.00%
Investments in nonconsolidated companies			$ 770.0
Future Cash Payments To Acquire Interest In Joint Venture			70.0
Mosaic investment in MWSPC Joint Venture | Maximum
Schedule of Equity Method Investments
Mosaic's exposure in MWSPC credit facility		$ 200.0
Ma'aden Wa'ad Al Shamal Phosphate Company [Member]
Schedule of Equity Method Investments
Aggregate cost of investment in phosphates greenfield mine including Mosaic's portion			$ 8,000.0
Annual production of finished product (Tonnes) | t			3.0
Number of lenders in MWSPC credit facility | financialinstitution				20
MWSPC line of credit facility, maximum borrowing capacity		$ 5,000.0				$ 506.0	$ 560.0
After project completion, number of months of shareholder tax amounts and severance fees for which the joint venture parties may have exposure		36 months
Loans Payable							$ 1,100.0
Ma'aden Wa'ad Al Shamal Phosphate Company [Member] | Maximum
Schedule of Equity Method Investments
Total cash investment from investors to acquire interest in MWSPC		$ 2,400.0

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