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SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 77 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Sales | $ 1,567.1 | $ 1,348.2 |
Income before taxes [Abstract] |  |  |
Income (loss) before taxes | 17.9 | (55.4) |
Restructuring charges | (8.2) | (92.8) | $ (157.8)
Acquisition-related costs | 7.0 | 10.2 |
Other operating (expense) income | (0.4) | 10.9 |
Interest expense | (52.4) | (48.5) |
Interest income | 0.2 | 0.3 |
Chlor Alkali Products and Vinyls Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 836.9 | 704.3 |
Income before taxes [Abstract] |  |  |
Income (loss) before taxes | 87.5 | 68.1 |
Epoxy Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 567.6 | 460.2 |
Income before taxes [Abstract] |  |  |
Income (loss) before taxes | (1.2) | 8.2 |
Winchester Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 162.6 | 183.7 |
Income before taxes [Abstract] |  |  |
Income (loss) before taxes | 25.1 | 28.7 |
Restructuring charges |  | (0.3) | $ (25.5)
Corporate/Other |  |  |
Income before taxes [Abstract] |  |  |
Pension income | 10.3 | 12.2 |
Environmental expense | (2.6) | (2.7) |
Other corporate and unallocated costs | (33.4) | (29.6) |
Restructuring charges | (8.2) | (92.8) |
Acquisition-related costs | $ 7.0 | $ 10.2 |

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