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SEGMENT INFORMATION
 6 Months Ended
Jun. 30, 2024
Segment Reporting [Abstract]  
SEGMENT INFORMATION
NOTE 16. SEGMENT INFORMATION
We define segment results as income (loss) before interest expense, interest income, other operating income (expense), non-operating pension income, other income and income taxes. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy, and Winchester. The three operating segments reflect the organization used by our management for purposes of allocating resources and assessing performance. Chlorine and caustic soda used in our Epoxy segment is transferred at cost from the Chlor Alkali Products and Vinyls segment. Sales are attributed to geographic areas based on customer location.
 Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Segment Detail($ in millions)
Sales
Chlor Alkali Products and Vinyls$920.3 $1,002.3 $1,804.9 $2,119.4 
Epoxy317.7 333.8 659.0 694.5 
Winchester406.0 366.6 815.4 733.1 
Total sales$1,644.0 $1,702.7 $3,279.3 $3,547.0 
Income before Taxes  
Chlor Alkali Products and Vinyls$99.3 $180.1 $175.9 $426.0 
Epoxy(3.0)(0.5)(14.8)20.9 
Winchester70.3 64.7 142.5 125.7 
Corporate/Other:
Environmental expense(6.4)(13.0)(12.2)(16.2)
Other corporate and unallocated costs(17.0)(22.4)(42.8)(56.7)
Restructuring charges(6.8)(19.2)(15.1)(80.1)
Other operating income— 27.0 0.2 27.5 
Interest expense(46.6)(45.3)(91.2)(87.7)
Interest income0.9 1.1 1.7 2.2 
Non-operating pension income5.9 5.4 12.7 11.1 
Income before taxes$96.6 $177.9 $156.9 $372.7 
Other operating income for both the three and six months ended June 30, 2023 included a gain of $27.0 million for the sale of our domestic private trucking fleet and operations.
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Segment Sales by Geography($ in millions)
Chlor Alkali Products and Vinyls
United States$671.5 $652.3 $1,307.1 $1,418.8 
Europe45.0 45.0 80.8 117.4 
Other foreign203.8 305.0 417.0 583.2 
Total Chlor Alkali Products and Vinyls920.3 1,002.3 1,804.9 2,119.4 
Epoxy
United States166.8 148.8 338.1 300.4 
Europe74.9 77.4 164.2 174.0 
Other foreign76.0 107.6 156.7 220.1 
Total Epoxy317.7 333.8 659.0 694.5 
Winchester
United States373.6 325.3 755.7 655.2 
Europe7.4 15.8 14.3 23.6 
Other foreign25.0 25.5 45.4 54.3 
Total Winchester406.0 366.6 815.4 733.1 
Total
United States1,211.9 1,126.4 2,400.9 2,374.4 
Europe127.3 138.2 259.3 315.0 
Other foreign304.8 438.1 619.1 857.6 
Total sales$1,644.0 $1,702.7 $3,279.3 $3,547.0 
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Segment Sales by Product Line($ in millions)
Chlor Alkali Products and Vinyls
Caustic soda$376.8 $454.9 $732.5 $1,001.7 
Chlorine, chlorine-derivatives and other products543.5 547.4 1,072.4 1,117.7 
Total Chlor Alkali Products and Vinyls920.3 1,002.3 1,804.9 2,119.4 
Epoxy
Aromatics and allylics128.3 128.7 283.2 271.0 
Epoxy resins189.4 205.1 375.8 423.5 
Total Epoxy317.7 333.8 659.0 694.5 
Winchester
Commercial222.0 199.4 464.8 399.9 
Military and law enforcement(1)
184.0 167.2 350.6 333.2 
Total Winchester406.0 366.6 815.4 733.1 
Total sales$1,644.0 $1,702.7 $3,279.3 $3,547.0 
(1)    For the three months ended June 30, 2024 and 2023, revenue recognized over time represented $37.8 million and $26.1 million, respectively, and for the six months ended June 30, 2024 and 2023, revenue recognized over time represented $57.6 million and $48.8 million, respectively, associated with governmental contracts within our Winchester business.