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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Indemnification asset	$ 19.7		$ 19.7		$ 23.0
Transactions with non-consolidated companies included in net sales	273.9	$ 200.4	627.7	$ 571.5
Transactions with non-consolidated companies included in cost of sales	535.1	224.2	989.8	619.7
Investee
Related Party Transaction [Line Items]
Net amount due from our non-consolidated companies	13.5		13.5		55.9
Indemnification asset	$ 19.7		$ 19.7		23.0
Beneficial Owner
Related Party Transaction [Line Items]
Mosaic's ownership percentage	50.00%		50.00%
Bridge loans to affiliate	$ 74.7		$ 74.7		$ 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	$ 2.5	$ 1.5	$ 7.1	$ 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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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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