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Investments in Non-Consolidated Companies - MWSPC Joint Venture (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 01, 2016	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments
Equity in net earnings (loss) of nonconsolidated companies		$ 196.0	$ 7.8	$ (93.8)
Investments in nonconsolidated companies		$ 885.9	691.8
Equity Method Investee | MWSPC
Schedule of Equity Method Investments
Payments to Acquire Equity Method Investments	$ 120.0
Proportion of assets represented by MWSPC		70.00%
Proportion of liabilities represented by MWSPC		62.00%
Equity in net earnings (loss) of nonconsolidated companies		$ 194.5	$ 5.0	$ (97.3)
Aggregate cost of investment in phosphates greenfield mine including Mosaic's portion to date		$ 8,000.0
Percentage Of Total Production Expected To Market		25.00%
Investments in nonconsolidated companies		$ 770.0

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Total investment required by the joint venture to develop a phosphates greenfield mine and chemical complexes

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Percent of joint venture production Mosaic expects to market

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