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Financing Arrangements - Long-term debt - Stated value (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 3,395.6		$ 3,975.0
Fair value adjustment of debt	7.7		10.4
Debt Instrument, Unamortized Discount	6.1		6.6
Total long term debt	3,397.2		3,978.8
Stated value of current portion of issued debt	983.9		594.8
Fair value adjustment of current portion of long-term debt	2.0		2.3
Debt Instrument, Unamortized Discount, Current	0.6		0.5
Carrying Value, current portion	985.3		596.6
Stated value of noncurrent portion of issued debt	2,411.7		3,380.2
Fair Market Value Adjustment, Total long term debt noncurrent	5.7		8.1
Debt Instrument, Unamortized Discount, Noncurrent	5.5		6.1
Total long-term debt, less current maturities	2,411.9		3,382.2
Letters of Credit Outstanding, Amount	50.0
Repayments of Subordinated Debt	550.0
Maturities of Long-term Debt
2023	985.3
2024	110.8
2025	21.9
2026	21.7
2027	707.8
Thereafter	1,549.7
Total long term debt	3,397.2		3,978.8
Mosaic Credit Facility
Long-term Debt, Excluding Current Maturities
Letters of Credit Outstanding, Amount	$ 10.9		$ 10.9
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.15%		0.40%	0.40%
Senior Notes | Senior Notes Due 2022 [Member]
Stated interest rates:
Stated interest rate	3.25%
Long term debt including current maturities	$ 550.0
Senior Notes | Senior Notes Due 2027 [Member]
Stated interest rates:
Stated interest rate	4.05%
Long term debt including current maturities	$ 700.0
Senior Notes | Senior Notes Due 2023
Stated interest rates:
Stated interest rate	4.25%
Long term debt including current maturities	$ 900.0
Senior Notes | Senior Notes Due 2033
Stated interest rates:
Stated interest rate	5.45%
Long term debt including current maturities	$ 500.0
Senior Notes | Senior Notes Due 2043
Stated interest rates:
Stated interest rate	5.625%
Long term debt including current maturities	$ 600.0
Senior Notes | Senior Notes Due 2041
Stated interest rates:
Stated interest rate	4.875%
Long term debt including current maturities	$ 300.0
Debentures | Debentures Due 2028
Stated interest rates:
Long term debt including current maturities	$ 147.1
Unsecured Notes
Stated interest rates:
Effective interest rate	5.10%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 3,000.0		$ 3,550.0
Fair value adjustment of debt	0.0		0.0
Debt Instrument, Unamortized Discount	6.1		6.6
Total long term debt	$ 2,993.9		3,543.4
Maturity year - earliest	Jan. 01, 2023
Maturity year - latest	Dec. 31, 2043
Maturities of Long-term Debt
Total long term debt	$ 2,993.9		3,543.4
Unsecured Notes | Minimum
Stated interest rates:
Stated interest rate	4.05%
Unsecured Notes | Maximum
Stated interest rates:
Stated interest rate	5.63%
Unsecured Debentures
Stated interest rates:
Effective interest rate	7.19%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 147.1		147.1
Fair value adjustment of debt	0.6		0.7
Debt Instrument, Unamortized Discount	0.0		0.0
Total long term debt	$ 147.7		147.8
Maturity year - latest	Dec. 31, 2028
Maturities of Long-term Debt
Total long term debt	$ 147.7		147.8
Unsecured Debentures | Minimum
Stated interest rates:
Stated interest rate	0.00%
Unsecured Debentures | Maximum
Stated interest rates:
Stated interest rate	7.30%
Finance Leases
Stated interest rates:
Effective interest rate	2.96%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 194.3		213.0
Fair value adjustment of debt	0.0		0.0
Debt Instrument, Unamortized Discount	0.0		0.0
Total long term debt	$ 194.3		213.0
Maturity year - earliest	Jan. 01, 2023
Maturity year - latest	Dec. 31, 2032
Maturities of Long-term Debt
Total long term debt	$ 194.3		213.0
Finance Leases | Minimum
Stated interest rates:
Stated interest rate	0.67%
Finance Leases | Maximum
Stated interest rates:
Stated interest rate	19.72%
Other
Stated interest rates:
Effective interest rate	5.19%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt	$ 54.2	[1]	64.9
Fair value adjustment of debt	7.1		9.7
Debt Instrument, Unamortized Discount	0.0		0.0
Total long term debt	$ 61.3	[1]	74.6
Maturity year - earliest	Jan. 01, 2023
Maturity year - latest	Dec. 31, 2026
Maturities of Long-term Debt
Total long term debt	$ 61.3	[1]	$ 74.6
Other | Minimum
Stated interest rates:
Stated interest rate	6.53%
Other | Maximum
Stated interest rates:
Stated interest rate	8.00%
[1] Includes deferred financing fees related to our long term debt.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

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