Lines of Credit, Long-Term Debt, Commitments and Contingencies (Details) $ in Millions							6 Months Ended
	Sep. 30, 2021 USD ($)	Jul. 21, 2021	Jun. 28, 2018	May 15, 2018 USD ($)	Apr. 27, 2018 USD ($) employee	Mar. 20, 2018 USD ($) subsidiary	Dec. 31, 2018	Apr. 02, 2022 USD ($)	Dec. 31, 2021 USD ($)
Lines of Credit, Long-Term Debt, Commitments and Contingencies
Lines of credit outstanding								$ 531.0	$ 516.0
Other long-term debt								38.0	39.0
Total debt at face value								714.0	717.0
Current maturities of long-term debt and unamortized discount								(9.0)	(9.0)
Long-term debt, less current maturities								705.0	708.0
Contingencies
Assets								$ 7,669.0	$ 7,503.0
Pork Product Purchasers | Pending Litigation
Contingencies
Number of plaintiffs			12				3
Odette Blanco De Fernandez | Pending Litigation
Contingencies
Term of concession to develop port facilities		70 years
HSBC | Pending Litigation
Contingencies
Damages sought	$ 10.0
HSBC | Pending Litigation | Minimum
Contingencies
Interest and other relief sought	$ 3.2
Cereoil
Contingencies
Percentage of ownership								45.00%
Cereoil | Cereoil Bankruptcy Trustee - Case One | Pending Litigation
Contingencies
Damages sought						$ 22.0
Number of subsidiaries | subsidiary						2
Cereoil | Cereoil Bankruptcy Trustee - Case Two | Pending Litigation
Contingencies
Damages sought					$ 23.0
Number of individuals employed by Seaboard serving as directors | employee					2
Total liabilities					$ 53.0
Assets					$ 30.0
Nolston
Contingencies
Percentage of ownership								45.00%
Nolston | Nolston Bankruptcy Trustee | Pending Litigation
Contingencies
Damages sought				$ 8.0
Total liabilities				29.0
Assets				$ 15.0
Committed and uncommitted bank lines
Lines of Credit, Long-Term Debt, Commitments and Contingencies
Weighted average interest rate (as a percent)								2.34%	2.71%
Committed and uncommitted bank lines | Denominated in foreign currencies
Lines of Credit, Long-Term Debt, Commitments and Contingencies
Lines of credit outstanding								$ 155.0	$ 218.0
Committed and uncommitted bank lines | South African Rand
Lines of Credit, Long-Term Debt, Commitments and Contingencies
Lines of credit outstanding								132.0	177.0
Committed bank line
Lines of Credit, Long-Term Debt, Commitments and Contingencies
Lines of credit outstanding								152.0	157.0
Uncommitted bank lines
Lines of Credit, Long-Term Debt, Commitments and Contingencies
Lines of credit outstanding								379.0	359.0
Term loan due 2028
Lines of Credit, Long-Term Debt, Commitments and Contingencies
Total debt at face value								$ 676.0	$ 677.0
Effective interest rate (as a percent)								2.08%	1.73%
Foreign subsidiary obligations
Lines of Credit, Long-Term Debt, Commitments and Contingencies
Total debt at face value									$ 1.0