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Financing Arrangements - Long-term debt - Stated value (Details 3) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2021	Aug. 19, 2021	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Long-term Debt, Excluding Current Maturities
Stated value of issued debt			$ 3,362.1		$ 3,395.6
Fair value adjustment of debt			5.4		7.7
Debt Instrument, Unamortized Discount			5.8		6.1
Total long term debt			3,361.7		3,397.2
Stated value of current portion of issued debt			129.2		983.9
Fair value adjustment of current portion of long-term debt			1.3		2.0
Debt Instrument, Unamortized Discount, Current			0.4		0.6
Carrying Value, current portion			130.1		985.3
Stated value of noncurrent portion of issued debt			3,232.9		2,411.7
Fair Market Value Adjustment, Total long term debt noncurrent			4.1		5.7
Debt Instrument, Unamortized Discount, Noncurrent			5.4		5.5
Total long-term debt, less current maturities			3,231.6		$ 2,411.9
Letters of Credit Outstanding, Amount			$ 50.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.15%	0.40%	0.15%		0.15%
Repayments of Subordinated Debt					$ 550.0
Servicing Liability			$ 0.0		0.0
The Mosaic Credit Facility amount of revolving credit loans		$ 2,500.0
Maturities of Long-term Debt
2024			130.1
2025			45.7
2026			28.8
2027			710.5
2028			554.3
Thereafter			1,892.3
Total long term debt			3,361.7		3,397.2
Mosaic Credit Facility
Long-term Debt, Excluding Current Maturities
Letters of Credit Outstanding, Amount			10.5		10.9
Line of Credit Facility, Commitment Fee Amount			$ 3.8		$ 3.8	$ 7.0
Senior Notes | Senior Notes Due 2022 [Member]
Stated interest rates:
Stated interest rate			3.25%		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 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
Senior Notes | Senior Notes Due 2023
Stated interest rates:
Stated interest rate			4.25%
Long-term Debt, Excluding Current Maturities
Repayments of Subordinated Debt			$ 900.0
Senior Notes | Senior Notes Due 2028
Stated interest rates:
Stated interest rate			5.375%
Long term debt including current maturities			$ 400.0
Debentures | Debentures Due 2028
Stated interest rates:
Long term debt including current maturities			$ 147.1
Unsecured Notes
Stated interest rates:
Effective interest rate			5.49%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt			$ 2,500.0		$ 3,000.0
Fair value adjustment of debt			0.0		0.0
Debt Instrument, Unamortized Discount			5.8		6.1
Total long term debt			2,494.2		2,993.9
Maturities of Long-term Debt
Total long term debt			$ 2,494.2		2,993.9
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			0.4		0.6
Debt Instrument, Unamortized Discount			0.0		0.0
Total long term debt			147.5		147.7
Maturities of Long-term Debt
Total long term debt			$ 147.5		147.7
Unsecured Debentures | Maximum
Stated interest rates:
Stated interest rate			7.30%
Finance Leases
Stated interest rates:
Effective interest rate			4.16%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt			$ 180.0		194.3
Fair value adjustment of debt			0.0		0.0
Debt Instrument, Unamortized Discount			0.0		0.0
Total long term debt			180.0		194.3
Maturities of Long-term Debt
Total long term debt			$ 180.0		194.3
Finance Leases | Minimum
Stated interest rates:
Stated interest rate			0.77%
Finance Leases | Maximum
Stated interest rates:
Stated interest rate			19.72%
Other
Stated interest rates:
Effective interest rate			6.43%
Long-term Debt, Excluding Current Maturities
Stated value of issued debt			$ 35.0	[1]	54.2
Fair value adjustment of debt			5.0		7.1
Debt Instrument, Unamortized Discount			0.0		0.0
Total long term debt			40.0	[1]	61.3
Maturities of Long-term Debt
Total long term debt			$ 40.0	[1]	61.3
Other | Minimum
Stated interest rates:
Stated interest rate			6.53%
Other | Maximum
Stated interest rates:
Stated interest rate			8.00%
Term Loan
Stated interest rates:
Effective interest rate			7.08%
Term Loan | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Stated interest rates:
Stated interest rate			3000.00%
Senior Loans | Senior Unsecured Term Loan Facility
Long-term Debt, Excluding Current Maturities
The Mosaic Credit Facility amount of revolving credit loans			$ 700.0
Long-Term Line of Credit			500.0
Senior Unsecured Term Loan Facility
Long-term Debt, Excluding Current Maturities
Stated value of issued debt			500.0		0.0
Fair value adjustment of debt			0.0		0.0
Debt Instrument, Unamortized Discount			0.0		0.0
Total long term debt			500.0		0.0
Maturities of Long-term Debt
Total long term debt			$ 500.0		$ 0.0
[1] Includes deferred financing fees related to our long-term debt.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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