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DEBT (Detail Textuals) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jan. 19, 2018 | Mar. 09, 2017 | Oct. 05, 2015 | Jun. 23, 2015
Debt Instruments [Abstract] |  |  |  |  |  |  |
2030 Senior Notes |  |  |  | $ 550.0 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.00% | 5.125% |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amended Delayed-Draw Term Loan Facility, Maximum Borrowing Capacity |  |  |  |  | $ 1,375.0 |  | $ 1,350.0
Write-off of unamortized deferred debt issuance costs | $ 2.6 | $ 2.7 |  |  |  |  |
Debt issuance costs | 8.5 | $ 11.2 |  |  |  |  |
Senior Credit Facility |  |  |  |  | 1,975.0 |  | 1,850.0
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 600.0 |  | $ 500.0
Line of Credit Facility, Remaining Borrowing Capacity | 596.5 |  |  |  |  |  |
Letters of Credit Outstanding, Amount | 3.5 |  |  |  |  |  |
Sumitomo Credit Facility |  |  |  |  |  | $ 800.0 |
Subfacility Of Senior Credit Facitility |  |  |  |  | $ 100.0 |  |
Annual Required Principal Payment (Percent) in Years 1 and 2 |  |  |  |  | 5.00% |  |
Annual Required Principal Payment (Percent) in Year 3 |  |  |  |  | 7.50% |  |
Annual Required Principal Payment (Percent) in Years 4 and 5 |  |  |  |  | 10.00% |  |
2027 Senior Notes |  |  |  |  | $ 500.0 |  |
$1,375.0 million Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of Debt | $ 550.0 |  |  |  |  |  |
$1,350.0 million Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of Debt |  |  | $ 1,282.5 |  |  |  |

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- Definition 5.125% senior notes due 2027 that were issued on March 9, 2017. + References No definition available. + Details
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- Definition 5.00% senior notes due 2030 that were issued on January 19, 2018. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the amended and restated delayed-draw term loan facility, which is included in the Amended Senior Credit Facility. + References No definition available. + Details
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- Definition Annual percentage of required principal payment on the term loan facility in year 3. + References No definition available. + Details
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- Definition Annual percentage of required principal payment on the term loan facility in years 1 and 2. + References No definition available. + Details
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- Definition Annual percentage of required principal payment on the term loan facility in years 4 and 5. + References No definition available. + Details
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- Definition Senior credit facility consisting of a senior revolving credit facility and a delayed-draw term loan facility. + References No definition available. + Details
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- Definition Amount of borrowing capacity under a subfacility of the senior revolving credit facility. + References No definition available. + Details
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- Definition Term credit facility with a syndicate of lenders and Sumitomo Mitsui Banking Corporation under which Olin obtained term loans that were borrowed upon on the Closing Date of the Transactions. + References No definition available. + Details
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- Definition Expense recognized for the write-off of unamortized deferred debt issuance costs as a result of the retirement of debt prior to its maturity date. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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