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Marketable Securities Held in Trusts (Details) $ in Millions	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 31, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract]
Amount deposited by Mosaic into the RCRA Trusts			$ 630.0
Number Of Decades Remaining For Trust			3
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 710.3	$ 696.3
Gross Unrealized Gains	12.1	27.5
Gross Unrealized Losses	(7.5)	(0.4)
Total debt securities	714.9	723.4
Cash And Cash Equivalents | Fair Value Inputs Level 1
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	8.1	11.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Total debt securities	8.1	11.8
Corporate Debt Securities | Fair Value Inputs Level 2
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	198.8	193.3
Gross Unrealized Gains	5.6	14.0
Gross Unrealized Losses	(0.9)	0.0
Total debt securities	203.5	207.3
Municipal Bonds | Fair Value Inputs Level 2
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	198.1	190.5
Gross Unrealized Gains	6.5	8.8
Gross Unrealized Losses	(0.5)	(0.3)
Total debt securities	204.1	199.0
U.S. Government Bonds | Fair Value Inputs Level 2
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	305.3	300.7
Gross Unrealized Gains	0.0	4.7
Gross Unrealized Losses	(6.1)	(0.1)
Total debt securities	$ 299.2	$ 305.3

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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