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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Indemnification asset	$ 22.2		$ 22.2		$ 23.0
Transactions with non-consolidated companies included in net sales	196.4	$ 222.5	353.8	$ 371.1
Transactions with non-consolidated companies included in cost of sales	239.6	218.4	489.4	395.5
Investee
Related Party Transaction [Line Items]
Net amount due from our non-consolidated companies		73.3		73.3	55.9
Indemnification asset	$ 22.2		$ 22.2		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	$ 3.0	$ 1.5	$ 4.6	$ 1.9
Percent of joint venture production Mosaic expects to market			25.00%

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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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