NOTE 15SEGMENTS The Company operates under six segments: Latex Binders, Synthetic Rubber, Performance Plastics, Polystyrene, Feedstocks, and Americas Styrenics. The Latex Binders segment produces styrene-butadiene latex (SB latex) and other latex polymers and binders, primarily for coated paper and packaging board, carpet and artificial turf backings, as well as a broad range of performance latex binders products, including SB latex, SA latex, and vinylidene chloride latex for CASE applications. The Synthetic Rubber segment produces synthetic rubber products, including SSBR, used predominantly in high-performance tires, impact modifiers and technical rubber products, such as conveyer belts, hoses, seals and gaskets. The Performance Plastics segment includes a variety of highly engineered compounds and blends, the Companys acrylonitrile-butadiene-styrene (ABS), styrene-acrylonitrile (SAN), and polycarbonate (PC) businesses, and engineered materials applications, which includes consumer electronics, medical, and thermoplastic elastomers (TPEs) applications. The Polystyrene segment includes a variety of general purpose polystyrenes (GPPS) and polystyrene that has been modified with polybutadiene rubber to increase its impact resistant properties (HIPS). The Feedstocks segment includes the Companys production and procurement of styrene monomer outside of North America, which is used as a key raw material in many of the Companys products, including polystyrene, SB latex, ABS resins, and SSBR. Lastly, the Americas Styrenics segment consists solely of the operations of the Companys 50%-owned joint venture, Americas Styrenics, a producer of both styrene monomer and polystyrene in North America. The following table provides disclosure of the Companys segment Adjusted EBITDA, which is used to measure segment operating performance and is defined below, for the three and nine months ended September 30, 2020 and 2019. Asset and intersegment sales information by reporting segment is not regularly reviewed or included with the Companys reporting to the chief operating decision maker. Therefore, this information has not been disclosed below. Refer to Note 3 for the Companys net sales to external customers by segment for the three and nine months ended September 30, 2020 and 2019.                        Latex  Synthetic  Performance      Americas Three Months Ended (1)  Binders  Rubber  Plastics  Polystyrene  Feedstocks  Styrenics September 30, 2020 $ 19.6 $ (2.2) $ 50.9  $ 20.7 $ 10.8 $ 18.3  September 30, 2019  $ 21.0  $ 7.4  $ 36.3  $ 16.3  $ 0.1  $ 25.7                         Latex  Synthetic  Performance      Americas Nine Months Ended (1)  Binders  Rubber  Plastics  Polystyrene  Feedstocks  Styrenics September 30, 2020 $ 58.1  $ (14.7)  $ 82.0  $ 47.4  $ (8.9)  $ 42.5  September 30, 2019  $ 59.1  $ 29.1  $ 106.1  $ 49.3  $ 16.7  $ 98.2  (1) The Companys primary measure of segment operating performance is Adjusted EBITDA, which is defined as income from continuing operations before interest expense, net; provision for income taxes; depreciation and amortization expense; loss on extinguishment of long-term debt; asset impairment charges; gains or losses on the dispositions of businesses and assets; restructuring charges; acquisition related costs and benefits and other items. Segment Adjusted EBITDA is a key metric that is used by management to evaluate business performance in comparison to budgets, forecasts, and prior year financial results, providing a measure that management believes reflects core operating performance by removing the impact of transactions and events that would not be considered a part of core operations. Other companies in the industry may define segment Adjusted EBITDA differently than the Company, and as a result, it may be difficult to use segment Adjusted EBITDA, or similarly named financial measures, that other companies may use to compare the performance of those companies to the Companys segment performance.  The reconciliation of income before income taxes to segment Adjusted EBITDA is as follows:                 Three Months Ended  Nine Months Ended    September 30,  September 30,   2020 2019 2020 2019 Income (loss) before income taxes  $ 56.3  $ 31.8  $ (55.5)  $ 122.1  Interest expense, net  10.0  9.2  32.0  29.3  Depreciation and amortization  30.7  33.0   101.8  101.7  Corporate Unallocated (2)   16.5   18.7   56.1   65.6  Adjusted EBITDA Addbacks (3)  4.6  14.1  72.0  39.8  Segment Adjusted EBITDA  $ 118.1  $ 106.8  $ 206.4  $ 358.5  (2) Corporate unallocated includes corporate overhead costs and certain other income and expenses. (3) Adjusted EBITDA addbacks for the three and nine months ended September 30, 2020 and 2019 are as follows:                  Three Months Ended  Nine Months Ended    September 30,  September 30,    2020 2019 2020 2019 Net gain on disposition of businesses and assets  $   $   $ (0.4)  $ (0.2)  Restructuring and other charges (Note 16)   2.0   0.2   10.1   0.3  Acquisition transaction and integration net costs      0.6   (0.3)   1.3  Asset impairment charges or write-offs (Note 9)         38.3     Other items (a)   2.6   13.3   24.3   38.4  Total Adjusted EBITDA Addbacks  $ 4.6  $ 14.1  $ 72.0  $ 39.8  (a) Other items for the three and nine months ended September 30, 2020 and 2019 primarily relate to fees incurred in conjunction with certain of the Companys strategic initiatives as well as advisory and professional fees incurred in conjunction with the Companys initiative to transition business services from Dow, including certain administrative services such as accounts payable, logistics, and IT services. New Segmentation As a subsequent event, effective October 1, 2020, the Company will realign its reporting segments to reflect the new model under which the business will be managed and results will be reviewed by the chief executive officer, who is the Companys chief operating decision maker. With this change, the Company will report operating results for seven segments, five of which will remain unchanged from the Companys current segmentation: Latex Binders, Synthetic Rubber, Feedstocks, Polystyrene, and Americas Styrenics. The Companys Performance Plastics segment, which currently includes a variety of compounds and blends as well as the results of the ABS, SAN, TPE, and PC businesses, will now be reorganized into two standalone reporting segments, Engineered Materials and Base Plastics. The new Engineered Materials segment will include the Companys compounds and blends products sold into higher growth and higher value applications, such as consumer electronics and medical, as well as the Companys TPE products which are sold into a variety of applications including footwear and automotive. The new Base Plastics segment will contain the results of the remaining businesses, including the ABS, SAN, and PC businesses, as well as compounds and blends for automotive and other applications. This segmentation change will provide enhanced clarity to investors by placing the results of the Companys products sold into engineered materials applications into a single reporting segment, which aligns with the Companys strategy to focus its efforts and investments in these applications, as they tend to be less cyclical and offer significantly higher growth and margin potential. The resegmentation will also reduce complexity as ABS, SAN, and PC are primary inputs into the downstream production of these highly engineered materials. The Companys Annual Report on Form 10-K for the year ended December 31, 2020 will be presented under this new segmentation.