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Marketable Securities Held in Trusts (Details) $ in Millions	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	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
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized cost	$ 695.6	$ 710.3
Gross unrealized gains	0.0	12.1
Gross unrealized losses	(54.6)	(7.5)
Debt Securities, Available-for-sale	641.0	714.9
Cash and Cash Equivalents | Level 1
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized cost	8.4	8.1
Gross unrealized gains	0.0	0.0
Gross unrealized losses	0.0	0.0
Debt Securities, Available-for-sale	8.4	8.1
Corporate debt securities | Level 2
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized cost	200.2	198.8
Gross unrealized gains	0.0	5.6
Gross unrealized losses	(20.7)	(0.9)
Debt Securities, Available-for-sale	179.5	203.5
Municipal bonds | Level 2
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized cost	202.1	198.1
Gross unrealized gains	0.0	6.5
Gross unrealized losses	(12.6)	(0.5)
Debt Securities, Available-for-sale	189.5	204.1
U.S. government bonds | Level 2
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized cost	284.7	305.3
Gross unrealized gains	0.0	0.0
Gross unrealized losses	(21.3)	(6.1)
Debt Securities, Available-for-sale	263.4	$ 299.2
Debt securities
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Debt Securities, Available-for-sale	632.6
Asset-Backed Securities | Level 2
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized cost	0.2
Gross unrealized gains	0.0
Gross unrealized losses	0.0
Debt Securities, Available-for-sale	$ 0.2

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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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