| Segment Information |
| | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2017 | | 2016 | | 2017 | | 2016 | Sales: | ($ in millions) | Chlor Alkali Products and Vinyls | $ | 881.2 |
| | $ | 779.4 |
| | $ | 2,583.2 |
| | $ | 2,216.7 |
| Epoxy | 489.9 |
| | 470.1 |
| | 1,549.5 |
| | 1,380.3 |
| Winchester | 183.8 |
| | 203.2 |
| | 515.8 |
| | 567.9 |
| Total sales | $ | 1,554.9 |
| | $ | 1,452.7 |
| | $ | 4,648.5 |
| | $ | 4,164.9 |
| Income (loss) before taxes: | | | | | | | | Chlor Alkali Products and Vinyls | $ | 129.7 |
| | $ | 53.7 |
| | $ | 270.0 |
| | $ | 152.5 |
| Epoxy | (1.7 | ) | | 10.3 |
| | (11.0 | ) | | 18.5 |
| Winchester | 17.2 |
| | 36.0 |
| | 61.3 |
| | 95.9 |
| Corporate/other: | | | | | | | | Pension income | 11.1 |
| | 15.4 |
| | 32.1 |
| | 40.2 |
| Environmental expense | (1.8 | ) | | (0.4 | ) | | (6.2 | ) | | (5.5 | ) | Other corporate and unallocated costs | (31.1 | ) | | (28.2 | ) | | (94.2 | ) | | (81.7 | ) | Restructuring charges | (9.2 | ) | | (5.2 | ) | | (25.9 | ) | | (106.2 | ) | Acquisition-related costs | (1.1 | ) | | (13.1 | ) | | (12.5 | ) | | (39.6 | ) | Other operating (expense) income | — |
| | (0.2 | ) | | (0.1 | ) | | 10.5 |
| Interest expense | (53.1 | ) | | (47.5 | ) | | (158.0 | ) | | (143.6 | ) | Interest income | 0.4 |
| | 0.5 |
| | 1.0 |
| | 1.3 |
| Income (loss) before taxes | $ | 60.4 |
| | $ | 21.3 |
| | $ | 56.5 |
| | $ | (57.7 | ) |
|