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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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