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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Indemnification asset	$ 21.3		$ 21.3		$ 40.6
Transactions with non-consolidated companies included in net sales	222.5	$ 289.3	371.1	$ 551.8
Transactions with non-consolidated companies included in cost of sales	218.4	299.8	395.5	550.8
Investee
Related Party Transaction [Line Items]
Net amount due to our non-consolidated companies	175.1		175.1
Net amount due from our non-consolidated companies					23.2
Indemnification asset	$ 21.3		$ 21.3
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		$ 54.2
Equity Method Investee
Related Party Transaction [Line Items]
Transactions with non-consolidated companies included in net sales	$ 1.5	$ 3.9	$ 1.9	$ 4.6
Percent of joint venture production Mosaic expects to market			25.00%

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