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SEGMENT INFORMATION
 3 Months Ended
Mar. 31, 2022
Segment Reporting [Abstract]  
SEGMENT INFORMATION
NOTE 12. 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 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 March 31,
 20222021
Sales:($ in millions)
Chlor Alkali Products and Vinyls$1,245.2 $867.0 
Epoxy789.5 662.6 
Winchester426.7 389.2 
Total sales$2,461.4 $1,918.8 
Income before taxes:  
Chlor Alkali Products and Vinyls$328.6 $271.1 
Epoxy138.0 65.2 
Winchester118.9 85.1 
Corporate/other:
Environmental expense(5.6)(0.3)
Other corporate and unallocated costs(30.3)(33.0)
Restructuring charges(3.1)(6.9)
Interest expense(32.9)(84.5)
Interest income0.4 0.1 
Non-operating pension income9.6 9.3 
Income before taxes$523.6 $306.1 
 Three Months Ended March 31,
 20222021
Sales by geography:($ in millions)
     Chlor Alkali Products and Vinyls
United States$819.4 $577.0 
Europe70.4 29.5 
Other foreign355.4 260.5 
               Total Chlor Alkali Products and Vinyls1,245.2 867.0 
     Epoxy
United States242.8 158.3 
Europe359.0 320.0 
Other foreign187.7 184.3 
               Total Epoxy789.5 662.6 
     Winchester
United States401.9 365.0 
Europe2.7 3.8 
Other foreign22.1 20.4 
               Total Winchester426.7 389.2 
     Total
United States1,464.1 1,100.3 
Europe432.1 353.3 
Other foreign565.2 465.2 
               Total sales$2,461.4 $1,918.8 

 Three Months Ended March 31,
 20222021
Sales by product line:($ in millions)
     Chlor Alkali Products and Vinyls
          Caustic soda$518.9 $347.0 
          Chlorine, chlorine-derivatives and other co-products726.3 520.0 
               Total Chlor Alkali Products and Vinyls1,245.2 867.0 
     Epoxy
          Aromatics and allylics392.0 312.0 
          Epoxy resins397.5 350.6 
               Total Epoxy789.5 662.6 
     Winchester
          Commercial314.2 261.0 
          Military and law enforcement112.5 128.2 
               Total Winchester426.7 389.2 
          Total sales$2,461.4 $1,918.8