XML 22 R11.htm IDEA: XBRL DOCUMENT
v3.10.0.1

ACQUISITION | 9 Months Ended
--- | ---
Sep. 30, 2018
Acquisition [Abstract] |
ACQUISITION | ACQUISITION On October 5, 2015 (the Closing Date), we completed the acquisition (the Acquisition) from DowDuPont Inc. (DowDuPont) (f/k/a The Dow Chemical Company) of its U.S. Chlor Alkali and Vinyl, Global Chlorinated Organics and Global Epoxy businesses (collectively, the Acquired Business), whose operating results are included in the accompanying financial statements since the Closing Date. We incurred costs related to the integration of the Acquired Business which consisted of advisory, legal, accounting and other professional fees of $0.4 million and $1.1 million for the three months ended September 30, 2018 and 2017, respectively, and $1.0 million and $12.5 million for the nine months ended September 30, 2018 and 2017, respectively.

X
- Definition Acquisition [Abstract] + References No definition available. + Details
Name: | oln_AcquisitionAbstract
Namespace Prefix: | oln_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details
Name: | us-gaap_BusinessCombinationDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration