Entity Tax Identification Number Entity Tax Identification Number Fair Value Investment NAV Redemption Notice Period Applicable Fair Value Investment NAV Redemption Notice Period Applicable Fair Value Investment NAV Redemption Notice Period Applicable Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] Vesting [Axis] Retirement Savings Plan Vesting [Axis] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Self-directed brokerage investment EBP, Self-Directed Brokerage Account [Member] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Text Block] Accrued expenses EBP, Accrued Expense Investments, at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Investment, Fair Value and NAV [Abstract] Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Table Text Block] Total assets EBP, Asset Assets EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Benefit Payments EBP, Payment to Participant [Policy Text Block] EBP, Fair Value, Investment, NAV, Unfunded Commitment EBP, Fair Value, Investment, NAV, Unfunded Commitment Total liabilities EBP, Liability 2 years of service [Member] 2 years of service [Member] Amendment Flag Amendment Flag Matching Contribution Immediate Vesting Percentage Matching Contribution Immediate Vesting Percentage Matching Contribution Immediate Vesting Percentage Olin Common Stock Sales, Amount Olin Common Stock Sales, Amount Value of investment purchased by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Olin Common Stock Fund Maximum Allocation Percentage Olin Common Stock Fund Maximum Allocation Percentage Olin Common Stock Fund Maximum Allocation Percentage Basis of Presentation EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] EBP, Investment, Number of Shares EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] Retirement Contribution Percentage Immediately Vested Retirement Contribution Percentage Immediately Vested Retirement Contribution Percentage Immediately Vested Investments Fair Value Hierarchy EBP, Investment, Fair Value and NAV [Table Text Block] Vesting [Domain] Retirement Savings Plan Vesting [Domain] Investments [Domain] Investments [Domain] Use of Estimates EBP, Use of Estimate [Policy Text Block] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] Automatic Escalation Percentage Maximum Automatic Escalation Percentage Maximum Automatic Escalation Percentage Maximum EBP, Schedule of Asset Held for Investment EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Automatic Escalation Percentage Automatic Escalation Percentage Automatic Escalation Percentage Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Olin Common Stock Purchases, Amount Olin Common Stock Purchases, Amount Value of investment purchased by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Minimum Minimum [Member] EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Investment Type [Axis] Investment Type [Axis] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividend income from investments EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Less than 2 years of service [Member] Less than 2 years of service [Member] EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] EBP, Plan Number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of the Plan EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Change in Recordkeeper and Custodian Change in Recordkeeper and Custodian [Text Block] Change in Recordkeeper and Custodian EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Tax Determination Letter, Date EBP, Tax Determination Letter, Date Olin Corporation common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Document [Domain] Document [Domain] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense 3 years of service or more [Member] 3 years of service or more [Member] Outstanding Loan Rate, Maximum Outstanding Loan Rate, Maximum Outstanding Loan Rate, Maximum Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Outstanding Loan Rate, Minimum Outstanding Loan Rate, Minimum Outstanding Loan Rate, Minimum EBP, Fair Value, Investment, NAV, Redemption, Description EBP, Fair Value, Investment, NAV, Redemption, Description EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Change in Recordkeeper and Custodian [Table] EBP, Change in Recordkeeper and Custodian [Table] EBP, Change in Recordkeeper and Custodian New Loan Rate, Maximum New Loan Rate, Maximum New Loan Rate, Maximum EBP, Tax Determination Letter, Obtained [true false] EBP, Tax Determination Letter, Obtained [true false] Voya/Voya Trust Voya/Voya Trust [Member] Retirement Contribution Vesting Percentage Retirement Contribution Vesting Percentage Retirement Contribution Vesting Percentage EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase in net assets available for benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Loan Maturity Date Loan Maturity Date Maturity date of participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). EBP, Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Excess deferrals due to participants EBP, Excess Contribution Payable Total receivables EBP, Receivable Text Block [Abstract] Employer contributions EBP, Employer Contribution, Receivable EBP, Participant Contribution, Automatic, Deferral Rate EBP, Participant Contribution, Automatic, Deferral Rate Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Maximum Loan Term, Years Maximum Loan Term, Years Maximum Loan Term, Years EBP, Change in Recordkeeper and Custodian [Line Items] EBP, Change in Recordkeeper and Custodian [Line Items] EBP, Change in Recordkeeper and Custodian EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] Document Period End Date Document Period End Date Plan Name EBP, Plan Name Administrative Expenses EBP, Expense [Policy Text Block] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Fees Paid to Related Parties and Parties-in-Interest Fees Paid to Related Parties and Parties-in-Interest Amount of fees paid to related parties and parties-in-interest. Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Document Type Document Type Total categorized investments measured at fair value Investments Measured at Fair Value Excluding Common/Collective Trust Funds [Member] EBP, Plan Termination [Text Block] EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Collective trust funds with fair value measured at net asset value (1) Common Collective Trust [Member] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Deductions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] EBP, Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Retirement Contribution Vesting Schedule Excluding Safe Harbor Retirement Contribution Vesting Schedule Excluding Safe Harbor [Table Text Block] Retirement Contribution Vesting Schedule Excluding Safe Harbor Liabilities EBP, Liability [Abstract] Related Party and Party-in-Interest Balances Related Party and Party-in-Interest Balance Tabular Disclosure [Table Text Block] Tabular disclosure of related party and party-in-interest balances with employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). EBP, Tax Status EBP, Tax Status [Text Block] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Empower/Empower Trust Empower/Empower Trust [Member] New Loan Rate, Minimum New Loan Rate, Minimum New Loan Rate, Minimum State Street State Street [Member] Document Information [Table] Document Information [Table] Employer Contributions Receivable Employer Contributions Receivable [Policy Text Block] Disclosure of accounting policy for contributions receivable from the employer in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). EBP 032 EBP 032 [Member] Olin Corporation Retirement Savings Plan Investments Measured at Net Asset Value Investments Measured at Net Asset Value [Table Text Block] Disclosure table summarizing investments measured using net asset value (NAV) per share as a practical expedient. Schedule of Assets Held for Investment [Text Block] EmployeeBenefitPlanScheduleOfAssetsHeldTextBlock [Text Block] Employee benefit plan, schedule of assets held. Trust Fund Management Trust Fund Management [Policy Text Block] Disclosure of accounting policy for the relevant Trust in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Other receivables EBP, Other Receivable Net assets available for benefits Net assets available for benefits at beginning of year Net assets available for benefits at end of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Fees Paid to Parties-in-Interest Fees Paid to Parties-in-Interest [Table Text Block] Tabular disclosure of fees paid to Parties-in-Interest. EBP, Forfeited Nonvested Account EBP, Forfeited Nonvested Account Document Information, Document [Axis] Document Information, Document [Axis] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]