PROPOSED MERGER	3 Months Ended
Mar. 31, 2015
Proposed Merger [Abstract]
Business Combination Disclosure	PROPOSED MERGER On March 27, 2015, Olin and The Dow Chemical Company (TDCC) announced that Olin had agreed to acquire certain chlor alkali and downstream derivatives businesses from TDCC using a Reverse Morris Trust structure. Olin and TDCC and certain affiliates have entered into an Agreement and Plan of Merger (the Merger Agreement) dated March 26, 2015 among Olin, TDCC, Blue Cube Acquisition Corporation, a wholly-owned subsidiary of Olin (Merger Sub) and Blue Cube Spinco Inc. (Spinco), pursuant to which, subject to the terms and conditions of the Merger Agreement and a Separation Agreement dated March 26, 2015 between TDCC and Spinco (the Separation Agreement), (1) TDCC will transfer its U.S. chlor alkali and vinyl, global chlorinated organics and global epoxy businesses (collectively, the Business) to Spinco, (2) TDCC will distribute Spinco’s stock to TDCC’s shareholders, at TDCC’s option, by way of a spin-off, a split-off or a combination thereof (the Distribution) and (3) Merger Sub will merge with and into Spinco, with Spinco as the surviving corporation (the Merger). Upon consummation of the transactions contemplated by the Merger Agreement and the Separation Agreement, the shares of Spinco common stock then outstanding will automatically be converted into approximately 80.6 million shares of Olin’s common stock and will represent approximately 50.5% of the outstanding shares of Olin’s common stock. Olin’s existing shareholders will continue to hold the remaining approximately 49.5% of the outstanding shares of Olin’s common stock. In the event that certain joint venture interests owned by an unrelated third party participant in a TDCC chlor alkali joint venture (DMCA JV) are transferred to Spinco in the transaction, approximately 6.9 million shares of additional Olin common stock would be issued in the Merger to TDCC shareholders receiving the Distribution. Prior to the Distribution, TDCC will receive from Spinco distributions of cash and debt instruments of Spinco with an aggregate value of approximately $2.0 billion (collectively, the Cash and Debt Distribution). TDCC expects to deliver the Spinco debt instruments received in the Cash and Debt Distribution in exchange for outstanding debt obligations to be identified by TDCC prior to the consummation of the Distribution (the Exchange). As the cash portion of the Cash and Debt Distribution, TDCC will receive from Spinco a total of $875 million immediately prior to the Distribution. The amount of the Cash and Debt Distribution is subject to adjustment based on Spinco’s working capital at the time of Distribution. If TDCC determines that the Exchange is not reasonably likely to be consummated at the time of the Distribution, TDCC may elect to receive the Spinco debt instruments in any event, or alternatively, may elect to receive cash for the full amount of the Cash and Debt Distribution; however TDCC has no obligation to waive the consummation of the Exchange as a condition to the closing of the Merger. On March 26, 2015, we and certain financial institutions executed commitment letters pursuant to which the financial institutions have agreed to provide financing to Spinco to finance the amount of the Cash and Debt Distribution and to provide financing to Olin to refinance certain of our existing debt (the Bridge Financing), in each case on the terms and conditions set forth in the commitment letters. For the three months ended March 31, 2015, we paid deferred debt issuance costs of $14.3 million associated with the Bridge Financing. During 2015, we expect to incur one-time costs in connection with the Merger and related transactions, including approximately$40 million to $45 million of advisory, legal, accounting and other professional fees, approximately $50 million of costs associated with the change in control mandatory acceleration of expenses under deferred compensation plans as a result of the transaction and approximately $25 million to $30 million financing-related fees. For the three months ended March 31, 2015 acquisition costs included $10.4 million associated with advisory, legal, accounting and other professional fees and interest expense included $0.4 million for financing fees. The consummation of the Merger is subject to the satisfaction or waiver of various customary closing conditions, including, among others, (1) the consummation of the separation of the Business from the other businesses of TDCC (the Separation) and the Distribution in accordance with the Separation Agreement, (2) the expiration or termination of any applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of regulatory approvals in certain other jurisdictions, (3) the effectiveness of registration statements to be filed with the SEC, (4) the approval by Olin’s shareholders of the issuance of Olin common stock in the Merger (the Share Issuance) and the amendment of Olin’s Amended and Restated Articles of Incorporation to increase the number of authorized shares of Olin common stock (the Charter Amendment), (5) the receipt by TDCC of a favorable IRS private letter ruling with respect to certain aspects of the Separation and the Distribution and an opinion from its counsel with respect to certain federal income tax matters related to the Separation, Distribution and Exchange, (6) the receipt by TDCC, on the one hand, and Olin, on the other hand, of an opinion from their respective counsel to the effect that the Merger will be treated as a “reorganization” for U.S. federal income tax purposes, (7) the consummation of the Exchange (unless TDCC elects to receive cash for the full amount of the Cash and Debt Distribution as described above), (8) material compliance by each party with its covenants and (9) subject to certain materiality qualifiers, the absence of breaches of representations and warranties. In connection with the transactions contemplated by the Merger Agreement and the Separation Agreement, certain additional agreements have been or will by entered into, including, among others, an Employee Matters Agreement, a Tax Matters Agreement and site, transitional and other services agreements, supply and purchase agreements, real estate agreements, technology licenses and intellectual property agreements. In addition, Olin and TDCC have agreed in connection with the transactions to enter into arrangements for the long-term supply of ethylene by TDCC to Olin at co-producer economics, pursuant to which, among other things, Olin will make an upfront payment of just over $300 million upon the closing of the Merger. Olin will also have the option of obtaining additional future ethylene supply by paying an additional reservation fee at closing.

PROPOSED MERGER

On March 27, 2015, Olin and The Dow Chemical Company (TDCC) announced that Olin had agreed to acquire certain chlor alkali and downstream derivatives businesses from TDCC using a Reverse Morris Trust structure. Olin and TDCC and certain affiliates have entered into an Agreement and Plan of Merger (the Merger Agreement) dated March 26, 2015 among Olin, TDCC, Blue Cube Acquisition Corporation, a wholly-owned subsidiary of Olin (Merger Sub) and Blue Cube Spinco Inc. (Spinco), pursuant to which, subject to the terms and conditions of the Merger Agreement and a Separation Agreement dated March 26, 2015 between TDCC and Spinco (the Separation Agreement), (1) TDCC will transfer its U.S. chlor alkali and vinyl, global chlorinated organics and global epoxy businesses (collectively, the Business) to Spinco, (2) TDCC will distribute Spinco’s stock to TDCC’s shareholders, at TDCC’s option, by way of a spin-off, a split-off or a combination thereof (the Distribution) and (3) Merger Sub will merge with and into Spinco, with Spinco as the surviving corporation (the Merger).

Upon consummation of the transactions contemplated by the Merger Agreement and the Separation Agreement, the shares of Spinco common stock then outstanding will automatically be converted into approximately 80.6 million shares of Olin’s common stock and will represent approximately 50.5% of the outstanding shares of Olin’s common stock. Olin’s existing shareholders will continue to hold the remaining approximately 49.5% of the outstanding shares of Olin’s common stock. In the event that certain joint venture interests owned by an unrelated third party participant in a TDCC chlor alkali joint venture (DMCA JV) are transferred to Spinco in the transaction, approximately 6.9 million shares of additional Olin common stock would be issued in the Merger to TDCC shareholders receiving the Distribution.

Prior to the Distribution, TDCC will receive from Spinco distributions of cash and debt instruments of Spinco with an aggregate value of approximately $2.0 billion (collectively, the Cash and Debt Distribution). TDCC expects to deliver the Spinco debt instruments received in the Cash and Debt Distribution in exchange for outstanding debt obligations to be identified by TDCC prior to the consummation of the Distribution (the Exchange). As the cash portion of the Cash and Debt Distribution, TDCC will receive from Spinco a total of $875 million immediately prior to the Distribution. The amount of the Cash and Debt Distribution is subject to adjustment based on Spinco’s working capital at the time of Distribution. If TDCC determines that the Exchange is not reasonably likely to be consummated at the time of the Distribution, TDCC may elect to receive the Spinco debt instruments in any event, or alternatively, may elect to receive cash for the full amount of the Cash and Debt Distribution; however TDCC has no obligation to waive the consummation of the Exchange as a condition to the closing of the Merger.

On March 26, 2015, we and certain financial institutions executed commitment letters pursuant to which the financial institutions have agreed to provide financing to Spinco to finance the amount of the Cash and Debt Distribution and to provide financing to Olin to refinance certain of our existing debt (the Bridge Financing), in each case on the terms and conditions set forth in the commitment letters. For the three months ended March 31, 2015, we paid deferred debt issuance costs of $14.3 million associated with the Bridge Financing.

During 2015, we expect to incur one-time costs in connection with the Merger and related transactions, including approximately$40 million to $45 million of advisory, legal, accounting and other professional fees, approximately $50 million of costs associated with the change in control mandatory acceleration of expenses under deferred compensation plans as a result of the transaction and approximately $25 million to $30 million financing-related fees. For the three months ended March 31, 2015 acquisition costs included $10.4 million associated with advisory, legal, accounting and other professional fees and interest expense included $0.4 million for financing fees.

The consummation of the Merger is subject to the satisfaction or waiver of various customary closing conditions, including, among others, (1) the consummation of the separation of the Business from the other businesses of TDCC (the Separation) and the Distribution in accordance with the Separation Agreement, (2) the expiration or termination of any applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of regulatory approvals in certain other jurisdictions, (3) the effectiveness of registration statements to be filed with the SEC, (4) the approval by Olin’s shareholders of the issuance of Olin common stock in the Merger (the Share Issuance) and the amendment of Olin’s Amended and Restated Articles of Incorporation to increase the number of authorized shares of Olin common stock (the Charter Amendment), (5) the receipt by TDCC of a favorable IRS private letter ruling with respect to certain aspects of the Separation and the Distribution and an opinion from its counsel with respect to certain federal income tax matters related to the Separation, Distribution and Exchange, (6) the receipt by TDCC, on the one hand, and Olin, on the other hand, of an opinion from their respective counsel to the effect that the Merger will be treated as a “reorganization” for U.S. federal income tax purposes, (7) the consummation of the Exchange (unless TDCC elects to receive cash for the full amount of the Cash and Debt Distribution as described above), (8) material compliance by each party with its covenants and (9) subject to certain materiality qualifiers, the absence of breaches of representations and warranties.

In connection with the transactions contemplated by the Merger Agreement and the Separation Agreement, certain additional agreements have been or will by entered into, including, among others, an Employee Matters Agreement, a Tax Matters Agreement and site, transitional and other services agreements, supply and purchase agreements, real estate agreements, technology licenses and intellectual property agreements. In addition, Olin and TDCC have agreed in connection with the transactions to enter into arrangements for the long-term supply of ethylene by TDCC to Olin at co-producer economics, pursuant to which, among other things, Olin will make an upfront payment of just over $300 million upon the closing of the Merger. Olin will also have the option of obtaining additional future ethylene supply by paying an additional reservation fee at closing.