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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Indemnification asset	$ 21.7		$ 21.7		$ 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	301.8	$ 483.6	$ 562.6	$ 880.5
Revenues	234.0	314.6	470.6	760.5
Amounts due to related parties	155.7		155.7		$ 0.8
Equity Method Investee
Related Party Transaction [Line Items]
Revenues	$ 5.7	$ 3.6	$ 9.0	$ 9.3

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