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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Indemnification asset	$ 21.0		$ 23.0
Transactions with non-consolidated companies included in net sales	157.4	$ 148.6
Transactions with non-consolidated companies included in cost of sales	217.7	177.1
Investee
Related Party Transaction [Line Items]
Net amount due from our non-consolidated companies	1.4		55.9
Indemnification asset	$ 21.0		23.0
Beneficial Owner
Related Party Transaction [Line Items]
Mosaic's ownership percentage	50.00%
Bridge loans to affiliate	$ 74.7
Allowance against bridge loans to affiliates	54.2		$ 54.2
Equity Method Investee
Related Party Transaction [Line Items]
Transactions with non-consolidated companies included in net sales	$ 1.6	$ 2.4
Percent of joint venture production Mosaic expects to market	25.00%

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Percent of joint venture production Mosaic expects to market

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Amount of allowance for credit loss of accounts and financing receivables. Includes, but is not limited to, notes and loan receivable.

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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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