STOCK-BASED COMPENSATION (Details Textuals) $ in Millions	Sep. 30, 2015 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Deferred Directors' Compensation Payout	$ 11.4

The amount of deferred directors' compensation to be paid out that is associated with the change in control mandatory acceleration of payments under the plan as a result of the Transactions.

No definition available.

Name:	olin_DeferredDirectorsCompensationPayout
Namespace Prefix:	olin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant