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Financing Arrangements - Mosaic Credit Facility (Details) $ in Millions |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 18, 2016 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 05, 2013 USD ($)
Debt Instrument |  |  |  |  |  |  |
Structured accounts payable arrangements |  | $ 640.0 |  | $ 640.0 |  | $ 740.6 |
Term Loan Facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Long term debt including current maturities | $ 720.0 |  |  |  |  |  |
Mosaic Credit Facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
The Mosaic Credit Facility amount of revolving credit loans |  | 2,200.0 |  | 2,200.0 |  |  |
Line of Credit | Mosaic Credit Facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Credit facility term | 5 years |  |  |  |  |  |
The Mosaic Credit Facility amount of revolving credit loans | $ 2,000.0 | 2,000.0 |  | 2,000.0 |  |  | $ 1,500.0
A failure to pay principal or interest under any one item of other indebtedness in excess of $50 million, or breach or default under such indebtedness that permits the holders thereof to accelerate the maturity thereof, will result in a cross-default in the Mosaic Credit Line |  | 50.0 |  | 50.0 |  |  |
A failure to pay principal or interest for multiple items of other indebtedness in excess of $75 million, or breach or default under such indebtedness that permits the holders thereof to accelerate the maturity thereof, will result in a cross-default in the Mosaic Credit Line |  | 75.0 |  | 75.0 |  |  |
Net available borrowings for revolving loans under the Mosaic Credit Facility |  | $ 2,190.0 |  | 2,190.0 |  | 1,990.0 |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.40% | 0.20% |  | 0.20% |  |
Line of Credit Facility, Commitment Fee Amount |  |  |  | $ 6.0 | $ 4.0 |  |
Line of Credit | Mosaic Credit Facility | Minimum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Credit facility, interest coverage ratio, minimum | 1.0 |  |  |  |  |  |
Debt Instrument, Covenant, Consolidated Capitalization Ratio, Maximum |  |  |  | 0.65 |  |  |
Line of Credit | Mosaic Credit Facility | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Credit facility, interest coverage ratio, minimum | 3.0 |  |  |  |  |  |
Debt Instrument, Covenant, Consolidated Capitalization Ratio, Maximum |  |  |  | 1.0 |  |  |
Line of Credit | Mosaic Credit Facility | Term Loan Facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
The Mosaic Credit Facility amount of revolving credit loans | $ 2,720.0 |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 54.7 |  | $ 54.7 |  |  |
Letter of Credit | Mosaic Credit Facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount | $ 18.3 | 12.4 |  | 12.4 |  | 13.1 |
Short-term Debt |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Short-term Debt |  | 0.1 |  | 0.1 |  | $ 41.6 |
Unfavorable Regulatory Action | 2015 Consent Decrees With EPA |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 50.0 |  | $ 50.0 |  |  |

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