Name:	oln_DefinedBenefitPlanRateOfReturnPercentageOfAssetsAlternateInvestmentRangeMaximum
Namespace Prefix:	oln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Rate of return minimum percentage of investments in alternate investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oln_DefinedBenefitPlanRateOfReturnPercentageOfAssetsAlternateInvestmentRangeMinimum
Namespace Prefix:	oln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Rate of return maximum percentage of investments in fixed income/cash to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oln_DefinedBenefitPlanRateOfReturnPercentageOfAssetsFixedIncomeCashRangeMaximum
Namespace Prefix:	oln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Rate of return minimum percentage of investments in fixed income/cash to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oln_DefinedBenefitPlanRateOfReturnPercentageOfAssetsFixedIncomeCashRangeMinimum
Namespace Prefix:	oln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Rate of return maximum percentage of investments in non-U. S. equities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oln_DefinedBenefitPlanRateOfReturnPercentageOfAssetsNonUSEquitiesRangeMaximum
Namespace Prefix:	oln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Rate of return minimum percentage of investments in non-U. S. equities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oln_DefinedBenefitPlanRateOfReturnPercentageOfAssetsNonUSEquitiesRangeMinimum
Namespace Prefix:	oln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Rate of return maximum percentage of investments in U. S. equities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oln_DefinedBenefitPlanRateOfReturnPercentageOfAssetsUSEquitiesRangeMaximum
Namespace Prefix:	oln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Rate of return minimum percentage of investments in U. S. equities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oln_DefinedBenefitPlanRateOfReturnPercentageOfAssetsUSEquitiesRangeMinimum
Namespace Prefix:	oln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.