Cash dividends per common share (in USD per share) Common Stock, Dividends, Per Share, Cash Paid Summary of Other Lease Information Summary Of Supplemental Cash Flow Information Related To Leases [Table Text Block] Summary Of Supplemental Cash Flow Information Related To Leases [Table Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Changes due to translation of foreign currencies Asset Retirement Obligation, Foreign Currency Translation Gain (Loss) Accounts payable Accounts Payable [Member] 5.875 Notes Due 2027 5.875 Notes Due 2027 [Member] 5.875 Notes Due 2027 October 1, 2025 October 1, 2025 [Member] October 1, 2025 Commodity derivative contracts Commodity swaps Commodity Contract [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Award Timing Predetermined Award Timing Predetermined [Flag] 2025 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Mississippi Canyon 387 Mississippi 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Treasury Stock Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Operating lease liabilities Present value of lease liabilities Operating Lease, Liability Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Remaining Finance Lease, Liability, to be Paid, After Year Four Finance Lease, Liability, to be Paid, After Year Four Income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Deferred credits and other liabilities Other Liabilities, Noncurrent Other taxes payable Accrual for Taxes Other than Income 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