SEGMENT INFORMATION (Details 2) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
64 Months Ended |
|
Sep. 30, 2026 |
Jun. 30, 2026 |
Mar. 31, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Jun. 30, 2026 |
Dec. 31, 2025 |
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
$ 1,747.7
|
|
|
$ 1,713.2
|
|
|
$ 5,072.6
|
$ 5,115.7
|
|
|
| Cost of goods sold |
1,575.0
|
|
|
1,529.8
|
|
|
4,653.9
|
4,645.5
|
|
|
| Gross Profit |
172.7
|
|
|
183.4
|
|
|
418.7
|
470.2
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(99.3)
|
|
|
(99.1)
|
|
|
(349.4)
|
(296.7)
|
|
|
| Restructuring charges |
(1.7)
|
$ (10.5)
|
$ (9.1)
|
(2.9)
|
$ (7.4)
|
$ (4.0)
|
(21.3)
|
(14.3)
|
$ (281.2)
|
|
| Other Operating Income |
0.3
|
|
|
0.4
|
|
|
0.4
|
0.2
|
|
|
| Interest Expense, Operating and Nonoperating |
(44.5)
|
|
|
(45.2)
|
|
|
(130.9)
|
(138.1)
|
|
|
| Non-operating pension income |
3.3
|
|
|
4.9
|
|
|
9.4
|
15.5
|
|
|
| Income (loss) before taxes |
17.1
|
|
|
41.5
|
|
|
(97.4)
|
36.8
|
|
|
| Depreciation and amortization |
114.4
|
|
|
133.8
|
|
|
353.7
|
395.9
|
|
|
| Segment Reporting, Long-Lived Asset, Expenditure for Addition |
33.9
|
|
|
71.1
|
|
|
106.6
|
163.5
|
|
|
| Assets |
7,405.7
|
|
|
7,600.9
|
|
|
7,405.7
|
7,600.9
|
|
$ 7,325.8
|
| Business Combination, Acquisition-Related Cost, Expense |
(13.7)
|
|
|
0.0
|
|
|
(24.3)
|
0.0
|
|
|
| Transferred over Time |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
97.0
|
|
|
90.4
|
|
|
330.0
|
243.3
|
|
|
| United States |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
1,223.3
|
|
|
1,136.1
|
|
|
3,580.3
|
3,475.2
|
|
|
| Europe |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
142.1
|
|
|
159.3
|
|
|
446.0
|
462.7
|
|
|
| Other foreign |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
382.3
|
|
|
417.8
|
|
|
1,046.3
|
1,177.8
|
|
|
| Chlor Alkali Products and Vinyls |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
850.8
|
|
|
924.0
|
|
|
2,427.2
|
2,828.0
|
|
|
| Cost of goods sold |
742.7
|
|
|
758.0
|
|
|
2,196.3
|
2,431.8
|
|
|
| Gross Profit |
108.1
|
|
|
166.0
|
|
|
230.9
|
396.2
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(36.8)
|
|
|
(38.4)
|
|
|
(150.7)
|
(125.4)
|
|
|
| Restructuring charges |
0.0
|
|
|
0.0
|
|
|
0.0
|
0.0
|
(155.3)
|
|
| Other Operating Income |
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 |
71.3
|
|
|
127.6
|
|
|
80.2
|
270.8
|
|
|
| Depreciation and amortization |
91.1
|
|
|
109.0
|
|
|
282.4
|
322.5
|
|
|
| Segment Reporting, Long-Lived Asset, Expenditure for Addition |
22.8
|
|
|
56.2
|
|
|
72.0
|
108.0
|
|
|
| Assets |
5,060.1
|
|
|
5,203.8
|
|
|
5,060.1
|
5,203.8
|
|
|
| Business Combination, Acquisition-Related Cost, Expense |
0.0
|
|
|
|
|
|
0.0
|
|
|
|
| Chlor Alkali Products and Vinyls | Caustic soda |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
363.2
|
|
|
410.2
|
|
|
1,040.5
|
1,232.1
|
|
|
| Chlor Alkali Products and Vinyls | Chlorine, chlorine-derivatives and other co-products |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
487.6
|
|
|
513.8
|
|
|
1,386.7
|
1,595.9
|
|
|
| Chlor Alkali Products and Vinyls | United States |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
577.8
|
|
|
624.7
|
|
|
1,687.0
|
1,935.8
|
|
|
| Chlor Alkali Products and Vinyls | Europe |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
36.0
|
|
|
48.4
|
|
|
95.7
|
123.6
|
|
|
| Chlor Alkali Products and Vinyls | Other foreign |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
237.0
|
|
|
250.9
|
|
|
644.5
|
768.6
|
|
|
| Epoxy |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
412.2
|
|
|
349.6
|
|
|
1,189.9
|
1,012.5
|
|
|
| Cost of goods sold |
396.7
|
|
|
367.4
|
|
|
1,131.1
|
1,052.5
|
|
|
| Gross Profit |
15.5
|
|
|
(17.8)
|
|
|
58.8
|
(40.0)
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(14.9)
|
|
|
(14.4)
|
|
|
(45.1)
|
(44.3)
|
|
|
| Restructuring charges |
0.0
|
|
|
0.0
|
|
|
0.0
|
0.0
|
$ (122.8)
|
|
| Other Operating Income |
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 |
0.6
|
|
|
(32.2)
|
|
|
13.7
|
(84.3)
|
|
|
| Depreciation and amortization |
11.1
|
|
|
13.2
|
|
|
34.7
|
39.1
|
|
|
| Segment Reporting, Long-Lived Asset, Expenditure for Addition |
2.0
|
|
|
3.3
|
|
|
8.6
|
16.1
|
|
|
| Assets |
922.1
|
|
|
923.8
|
|
|
922.1
|
923.8
|
|
|
| Business Combination, Acquisition-Related Cost, Expense |
0.0
|
|
|
|
|
|
0.0
|
|
|
|
| Epoxy | Aromatics and allylics |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
169.8
|
|
|
128.5
|
|
|
486.6
|
400.3
|
|
|
| Epoxy | Epoxy resins |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
242.4
|
|
|
221.1
|
|
|
703.3
|
612.2
|
|
|
| Epoxy | United States |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
208.7
|
|
|
139.5
|
|
|
557.1
|
424.4
|
|
|
| Epoxy | Europe |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
102.1
|
|
|
88.1
|
|
|
304.8
|
283.3
|
|
|
| Epoxy | Other foreign |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
101.4
|
|
|
122.0
|
|
|
328.0
|
304.8
|
|
|
| Winchester |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
484.7
|
|
|
439.6
|
|
|
1,455.5
|
1,275.2
|
|
|
| Cost of goods sold |
428.5
|
|
|
398.5
|
|
|
1,306.2
|
1,143.7
|
|
|
| Gross Profit |
56.2
|
|
|
41.1
|
|
|
149.3
|
131.5
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(22.4)
|
|
|
(21.8)
|
|
|
(72.2)
|
(64.4)
|
|
|
| Restructuring charges |
0.0
|
|
|
0.0
|
|
|
0.0
|
0.0
|
|
|
| Other Operating Income |
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 |
33.8
|
|
|
19.3
|
|
|
77.1
|
67.1
|
|
|
| Depreciation and amortization |
9.0
|
|
|
7.8
|
|
|
26.7
|
25.2
|
|
|
| Segment Reporting, Long-Lived Asset, Expenditure for Addition |
9.1
|
|
|
10.3
|
|
|
23.6
|
33.1
|
|
|
| Assets |
838.7
|
|
|
924.5
|
|
|
838.7
|
924.5
|
|
|
| Business Combination, Acquisition-Related Cost, Expense |
0.0
|
|
|
|
|
|
0.0
|
|
|
|
| Winchester | Commercial |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
206.6
|
|
|
168.9
|
|
|
567.8
|
491.6
|
|
|
| Winchester | Military and law enforcement |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
278.1
|
|
|
270.7
|
|
|
887.7
|
783.6
|
|
|
| Winchester | United States |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
436.8
|
|
|
371.9
|
|
|
1,336.2
|
1,115.0
|
|
|
| Winchester | Europe |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
4.0
|
|
|
22.8
|
|
|
45.5
|
55.8
|
|
|
| Winchester | Other foreign |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
43.9
|
|
|
44.9
|
|
|
73.8
|
104.4
|
|
|
| Corporate/ other |
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Sales |
0.0
|
|
|
0.0
|
|
|
0.0
|
0.0
|
|
|
| Cost of goods sold |
7.1
|
|
|
5.9
|
|
|
20.3
|
17.5
|
|
|
| Gross Profit |
(7.1)
|
|
|
(5.9)
|
|
|
(20.3)
|
(17.5)
|
|
|
| Segment Reporting, Other Segment Item, Amount |
(25.2)
|
|
|
(24.5)
|
|
|
(81.4)
|
(62.6)
|
|
|
| Restructuring charges |
(1.7)
|
|
|
(2.9)
|
|
|
(21.3)
|
(14.3)
|
|
|
| Other Operating Income |
0.3
|
|
|
(0.4)
|
|
|
0.4
|
(0.2)
|
|
|
| Interest Expense, Operating and Nonoperating |
44.5
|
|
|
45.2
|
|
|
130.9
|
138.1
|
|
|
| Non-operating pension income |
3.3
|
|
|
4.9
|
|
|
9.4
|
15.5
|
|
|
| Income (loss) before taxes |
(88.6)
|
|
|
(73.2)
|
|
|
(268.4)
|
(216.8)
|
|
|
| Depreciation and amortization |
3.2
|
|
|
3.8
|
|
|
9.9
|
9.1
|
|
|
| Segment Reporting, Long-Lived Asset, Expenditure for Addition |
0.0
|
|
|
1.3
|
|
|
2.4
|
6.3
|
|
|
| Assets |
584.8
|
|
|
548.8
|
|
|
584.8
|
548.8
|
|
|
| Business Combination, Acquisition-Related Cost, Expense |
13.7
|
|
|
|
|
|
24.3
|
|
|
|
| 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
|
|
|