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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Net amount due from our non-consolidated companies	$ 658.1		$ 658.1		$ 445.0
Indemnification asset	22.8		22.8		21.0
Transactions with non-consolidated companies included in net sales	965.0	$ 273.9	2,378.0	$ 627.7
Transactions with non-consolidated companies included in cost of sales	$ 1,198.8	535.1	$ 2,668.2	989.8
Percent of joint venture production Mosaic expects to market			25.00%
Gulf Sulphur Services Ltd., LLLP
Related Party Transaction [Line Items]
Mosaic's ownership percentage	50.00%		50.00%
Savage Companies
Related Party Transaction [Line Items]
Mosaic's ownership percentage	50.00%		50.00%
Investee
Related Party Transaction [Line Items]
Net amount due from our non-consolidated companies	$ 373.4		$ 373.4		63.0
Equity Method Investee
Related Party Transaction [Line Items]
Transactions with non-consolidated companies included in net sales	7.5	$ 2.5	16.6	$ 7.1
Gulf Marine Soulutions, LLC
Related Party Transaction [Line Items]
Bridge loans to affiliate	74.7		74.7		$ 74.7
Allowance against bridge loans to affiliates	$ 54.2		$ 54.2

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Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold.

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