SEGMENT INFORMATION (Details 2) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
64 Months Ended |
|
Jun. 30, 2026 |
Mar. 31, 2026 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Dec. 31, 2025 |
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
$ 1,741.9
|
|
$ 1,758.3
|
|
$ 3,324.9
|
$ 3,402.5
|
|
|
| Cost of goods sold |
1,571.7
|
|
1,620.2
|
|
3,078.9
|
3,115.7
|
|
|
| Gross Profit |
170.2
|
|
138.1
|
|
246.0
|
286.8
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(103.7)
|
|
(96.6)
|
|
(250.1)
|
(197.6)
|
|
|
| Restructuring charges |
(10.5)
|
$ (9.1)
|
(7.4)
|
$ (4.0)
|
(19.6)
|
(11.4)
|
$ (279.5)
|
|
| Interest Expense, Operating and Nonoperating |
(44.3)
|
|
(45.6)
|
|
(86.4)
|
(92.9)
|
|
|
| Non-operating pension income |
2.6
|
|
4.9
|
|
6.1
|
10.6
|
|
|
| Income (loss) before taxes |
3.8
|
|
(6.8)
|
|
(114.5)
|
(4.7)
|
|
|
| Depreciation and amortization |
122.1
|
|
129.9
|
|
239.3
|
262.1
|
|
|
| Segment, Expenditure, Addition to Long-Lived Assets |
29.0
|
|
31.0
|
|
72.7
|
92.4
|
|
|
| Assets |
7,440.6
|
|
7,667.9
|
|
7,440.6
|
7,667.9
|
7,440.6
|
$ 7,325.8
|
| Business Combination, Acquisition Related Costs |
(10.6)
|
|
0.0
|
|
(10.6)
|
0.0
|
|
|
| Transferred over Time |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
112.2
|
|
94.4
|
|
233.0
|
152.9
|
|
|
| United States |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
1,211.0
|
|
1,201.9
|
|
2,357.0
|
2,339.1
|
|
|
| Europe |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
167.0
|
|
155.8
|
|
303.9
|
303.4
|
|
|
| Other foreign |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
363.9
|
|
400.6
|
|
664.0
|
760.0
|
|
|
| Chlor Alkali Products and Vinyls |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
819.5
|
|
979.5
|
|
1,576.4
|
1,904.0
|
|
|
| Cost of goods sold |
726.5
|
|
871.8
|
|
1,453.6
|
1,673.8
|
|
|
| Gross Profit |
93.0
|
|
107.7
|
|
122.8
|
230.2
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(39.6)
|
|
(42.8)
|
|
(113.9)
|
(87.0)
|
|
|
| Restructuring charges |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
(151.0)
|
|
| Interest Expense, Operating and Nonoperating |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Non-operating pension income |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Income (loss) before taxes |
53.4
|
|
64.9
|
|
8.9
|
143.2
|
|
|
| Depreciation and amortization |
98.1
|
|
106.3
|
|
191.3
|
213.5
|
|
|
| Segment, Expenditure, Addition to Long-Lived Assets |
19.2
|
|
14.2
|
|
49.2
|
51.8
|
|
|
| Assets |
5,118.1
|
|
5,277.4
|
|
5,118.1
|
5,277.4
|
5,118.1
|
|
| Business Combination, Acquisition Related Costs |
0.0
|
|
|
|
0.0
|
|
|
|
| Chlor Alkali Products and Vinyls | Caustic soda |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
348.8
|
|
435.1
|
|
677.3
|
821.9
|
|
|
| Chlor Alkali Products and Vinyls | Chlorine, chlorine-derivatives and other co-products |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
470.7
|
|
544.4
|
|
899.1
|
1,082.1
|
|
|
| Chlor Alkali Products and Vinyls | United States |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
558.4
|
|
664.2
|
|
1,109.2
|
1,311.1
|
|
|
| Chlor Alkali Products and Vinyls | Europe |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
35.1
|
|
42.0
|
|
59.7
|
75.2
|
|
|
| Chlor Alkali Products and Vinyls | Other foreign |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
226.0
|
|
273.3
|
|
407.5
|
517.7
|
|
|
| Epoxy |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
422.1
|
|
331.2
|
|
777.7
|
662.9
|
|
|
| Cost of goods sold |
391.3
|
|
340.0
|
|
734.4
|
685.1
|
|
|
| Gross Profit |
30.8
|
|
(8.8)
|
|
43.3
|
(22.2)
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(14.8)
|
|
(14.9)
|
|
(30.2)
|
(29.9)
|
|
|
| Restructuring charges |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
(125.4)
|
|
| Interest Expense, Operating and Nonoperating |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Non-operating pension income |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Income (loss) before taxes |
16.0
|
|
(23.7)
|
|
13.1
|
(52.1)
|
|
|
| Depreciation and amortization |
11.7
|
|
13.1
|
|
23.6
|
25.9
|
|
|
| Segment, Expenditure, Addition to Long-Lived Assets |
2.1
|
|
2.0
|
|
6.6
|
12.8
|
|
|
| Assets |
934.1
|
|
949.3
|
|
934.1
|
949.3
|
934.1
|
|
| Business Combination, Acquisition Related Costs |
0.0
|
|
|
|
0.0
|
|
|
|
| Epoxy | Aromatics and allylics |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
172.3
|
|
130.8
|
|
316.8
|
271.8
|
|
|
| Epoxy | Epoxy resins |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
249.8
|
|
200.4
|
|
460.9
|
391.1
|
|
|
| Epoxy | United States |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
196.8
|
|
140.8
|
|
348.4
|
284.9
|
|
|
| Epoxy | Europe |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
102.3
|
|
93.4
|
|
202.7
|
195.2
|
|
|
| Epoxy | Other foreign |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
123.0
|
|
97.0
|
|
226.6
|
182.8
|
|
|
| Winchester |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
500.3
|
|
447.6
|
|
970.8
|
835.6
|
|
|
| Cost of goods sold |
447.2
|
|
402.6
|
|
877.7
|
745.2
|
|
|
| Gross Profit |
53.1
|
|
45.0
|
|
93.1
|
90.4
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(25.0)
|
|
(20.0)
|
|
(49.8)
|
(42.6)
|
|
|
| Restructuring charges |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Interest Expense, Operating and Nonoperating |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Non-operating pension income |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Income (loss) before taxes |
28.1
|
|
25.0
|
|
43.3
|
47.8
|
|
|
| Depreciation and amortization |
8.8
|
|
7.9
|
|
17.7
|
17.4
|
|
|
| Segment, Expenditure, Addition to Long-Lived Assets |
6.7
|
|
11.7
|
|
14.5
|
22.8
|
|
|
| Assets |
833.1
|
|
866.7
|
|
833.1
|
866.7
|
833.1
|
|
| Business Combination, Acquisition Related Costs |
0.0
|
|
|
|
0.0
|
|
|
|
| Winchester | Commercial |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
192.4
|
|
169.7
|
|
361.2
|
325.6
|
|
|
| Winchester | Military and law enforcement |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
307.9
|
|
277.9
|
|
609.6
|
510.0
|
|
|
| Winchester | United States |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
455.8
|
|
396.9
|
|
899.4
|
743.1
|
|
|
| Winchester | Europe |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
29.6
|
|
20.4
|
|
41.5
|
33.0
|
|
|
| Winchester | Other foreign |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
14.9
|
|
30.3
|
|
29.9
|
59.5
|
|
|
| Corporate/ other |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Cost of goods sold |
6.7
|
|
5.8
|
|
13.2
|
11.6
|
|
|
| Gross Profit |
(6.7)
|
|
(5.8)
|
|
(13.2)
|
(11.6)
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(24.3)
|
|
(18.9)
|
|
(56.2)
|
(38.1)
|
|
|
| Restructuring charges |
(10.5)
|
|
(7.4)
|
|
(19.6)
|
(11.4)
|
|
|
| Interest Expense, Operating and Nonoperating |
44.3
|
|
45.6
|
|
86.4
|
92.9
|
|
|
| Non-operating pension income |
2.6
|
|
4.9
|
|
6.1
|
10.6
|
|
|
| Income (loss) before taxes |
(93.7)
|
|
(73.0)
|
|
(179.8)
|
(143.6)
|
|
|
| Depreciation and amortization |
3.5
|
|
2.6
|
|
6.7
|
5.3
|
|
|
| Segment, Expenditure, Addition to Long-Lived Assets |
1.0
|
|
3.1
|
|
2.4
|
5.0
|
|
|
| Assets |
555.3
|
|
574.5
|
|
555.3
|
574.5
|
$ 555.3
|
|
| Business Combination, Acquisition Related Costs |
10.6
|
|
|
|
10.6
|
|
|
|
| Corporate/ other | United States |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Corporate/ other | Europe |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
|
|
| Corporate/ other | Other foreign |
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
| Sales |
$ 0.0
|
|
$ 0.0
|
|
$ 0.0
|
$ 0.0
|
|
|