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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Indemnification asset	$ 20.6		$ 20.6		$ 20.9
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	306.8	$ 257.7	$ 869.5	$ 1,122.9
Revenues	223.8	218.5	694.4	979.0
Amounts due to related parties	1.0		1.0		$ 0.8
Equity Method Investee
Related Party Transaction [Line Items]
Revenues	$ 3.3	$ 3.6	$ 12.3	$ 12.9

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