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Marketable Securities Held in Trusts (Details) $ in Millions | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | 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 | $ 682.7 | $ 678.3 |
Gross unrealized gains | 1.0 | 0.5 |
Gross unrealized losses | (21.5) | (28.7) |
Debt Securities, Available-for-sale | 662.2 | 650.1 |
Cash and Cash Equivalents | Level 1 |  |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |  |
Amortized cost | 4.8 | 7.7 |
Gross unrealized gains | 0.0 | 0.0 |
Gross unrealized losses | 0.0 | 0.0 |
Debt Securities, Available-for-sale | 4.8 | 7.7 |
Corporate debt securities | Level 2 |  |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |  |
Amortized cost | 203.0 | 203.8 |
Gross unrealized gains | 0.2 | 0.1 |
Gross unrealized losses | (13.4) | (17.1) |
Debt Securities, Available-for-sale | 189.8 | 186.8 |
Municipal bonds | Level 2 |  |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |  |
Amortized cost | 203.9 | 197.0 |
Gross unrealized gains | 0.5 | 0.4 |
Gross unrealized losses | (6.9) | (8.0) |
Debt Securities, Available-for-sale | 197.5 | 189.4 |
U.S. government bonds | Level 2 |  |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |  |
Amortized cost | 271.0 | 269.6 |
Gross unrealized gains | 0.3 | 0.0 |
Gross unrealized losses | (1.2) | (3.6) |
Debt Securities, Available-for-sale | 270.1 | 266.0 |
Debt securities |  |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |  |
Debt Securities, Available-for-sale | $ 657.4 |  |
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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