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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Indemnification asset	$ 22.4		$ 22.4		$ 23.7
Percent of joint venture production Mosaic expects to market			25.00%
Related Party
Related Party Transaction [Line Items]
Transactions with non-consolidated companies included in cost of sales	257.7	$ 1,198.8	$ 1,122.9	$ 2,668.2
Revenues	218.5	965.0	979.0	2,378.0
Amounts due to related parties	89.6		89.6		$ 56.8
Equity Method Investee
Related Party Transaction [Line Items]
Revenues	$ 3.6	$ 7.5	$ 12.9	$ 16.6

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