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SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 95 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Sales | $ 1,872.4 |  |  | $ 1,554.9 |  |  |  | $ 5,311.1 | $ 4,648.5 |
Income (loss) before taxes: |  |  |  |  |  |  |  |  |  |
Income (loss) before taxes | 261.4 |  |  | 60.4 |  |  |  | 363.2 | 56.5 |
Environmental income (expense) | 110.8 |  |  | (1.8) |  |  |  | 104.1 | (6.2) |
Restructuring charges | (3.3) | $ (6.4) | $ (4.0) | (9.2) | $ (8.5) | $ (8.2) |  | (13.7) | (25.9) | $ (200.9)
Acquisition-related costs | (0.4) |  |  | (1.1) |  |  |  | (1.0) | (12.5) |
Other operating (expense) income | (1.7) |  |  | 0.0 |  |  |  | 6.4 | (0.1) |
Interest expense | (59.2) |  |  | (53.1) |  |  |  | (184.0) | (158.0) |
Interest income | 0.3 |  |  | 0.4 |  |  |  | 1.1 | 1.0 |
Non-operating pension income | 5.4 |  |  | 8.4 |  |  |  | 16.2 | 25.5 |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |  |  |  |  | (1.9) | (0.4) |
Recoveries From Third Parties Of Costs Incurred And Expensed | 110.0 |  |  | 0.0 |  |  |  | 110.0 | 0.0 |
Environmental Possible Additional Contingent Environmental Liabilities | 10.0 |  |  |  |  |  |  | 10.0 |  | 10.0
Gain in Other Operating (Expense) Income due to Insurance Recoveries |  |  |  |  |  |  | $ 8.0 |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Earnings (losses) of non-consolidated affiliates | 0.4 |  |  | 0.5 |  |  |  | (20.2) | 1.5 |
BayGas non-cash impairment charge |  |  |  |  |  |  |  | 21.5 |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 1,872.4 |  |  | 1,554.9 |  |  |  | 5,311.1 | 4,648.5 |
United States |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 1,047.4 |  |  | 915.8 |  |  |  | 3,006.1 | 2,658.4 |
Europe |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 331.2 |  |  | 240.9 |  |  |  | 906.2 | 786.0 |
Other foreign |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 493.8 |  |  | 398.2 |  |  |  | 1,398.8 | 1,204.1 |
Chlor Alkali Products and Vinyls Segment |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Sales | 1,051.1 |  |  | 881.2 |  |  |  | 3,005.9 | 2,583.2 |
Income (loss) before taxes: |  |  |  |  |  |  |  |  |  |
Income (loss) before taxes | 210.8 |  |  | 129.7 |  |  |  | 490.7 | 270.0 |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 1,051.1 |  |  | 881.2 |  |  |  | 3,005.9 | 2,583.2 |
Chlor Alkali Products and Vinyls Segment | United States |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 682.8 |  |  | 589.5 |  |  |  | 1,956.0 | 1,706.6 |
Chlor Alkali Products and Vinyls Segment | Europe |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 40.1 |  |  | 31.6 |  |  |  | 136.2 | 92.7 |
Chlor Alkali Products and Vinyls Segment | Other foreign |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 328.2 |  |  | 260.1 |  |  |  | 913.7 | 783.9 |
Epoxy Segment |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Sales | 647.3 |  |  | 489.9 |  |  |  | 1,794.4 | 1,549.5 |
Income (loss) before taxes: |  |  |  |  |  |  |  |  |  |
Income (loss) before taxes | 31.1 |  |  | (1.7) |  |  |  | 33.8 | (11.0) |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 647.3 |  |  | 489.9 |  |  |  | 1,794.4 | 1,549.5 |
Epoxy Segment | United States |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 209.1 |  |  | 159.8 |  |  |  | 589.9 | 488.0 |
Epoxy Segment | Europe |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 289.3 |  |  | 206.8 |  |  |  | 763.0 | 685.1 |
Epoxy Segment | Other foreign |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 148.9 |  |  | 123.3 |  |  |  | 441.5 | 376.4 |
Winchester Segment |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Sales | 174.0 |  |  | 183.8 |  |  |  | 510.8 | 515.8 |
Income (loss) before taxes: |  |  |  |  |  |  |  |  |  |
Income (loss) before taxes | 10.3 |  |  | 17.2 |  |  |  | 34.1 | 61.3 |
Restructuring charges |  |  |  |  |  |  |  |  |  | $ (27.1)
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 174.0 |  |  | 183.8 |  |  |  | 510.8 | 515.8 |
Winchester Segment | United States |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 155.5 |  |  | 166.5 |  |  |  | 460.2 | 463.8 |
Winchester Segment | Europe |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 1.8 |  |  | 2.5 |  |  |  | 7.0 | 8.2 |
Winchester Segment | Other foreign |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 16.7 |  |  | 14.8 |  |  |  | 43.6 | 43.8 |
Corporate/Other |  |  |  |  |  |  |  |  |  |
Income (loss) before taxes: |  |  |  |  |  |  |  |  |  |
Environmental income (expense) | 110.8 |  |  | (1.8) |  |  |  | 104.1 | (6.2) |
Other corporate and unallocated costs | (42.7) |  |  | (28.4) |  |  |  | (124.5) | (87.6) |
Restructuring charges | (3.3) |  |  | (9.2) |  |  |  | (13.7) | (25.9) |
Acquisition-related costs | (0.4) |  |  | (1.1) |  |  |  | (1.0) | (12.5) |
Gain (Loss) on Disposition of Property Plant Equipment | 1.7 |  |  |  |  |  |  | 1.7 |  |
Caustic soda | Chlor Alkali Products and Vinyls Segment |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 539.2 |  |  | 442.7 |  |  |  | 1,571.1 | 1,272.5 |
Chlorine, chlorine derivatives and other co-products | Chlor Alkali Products and Vinyls Segment |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 511.9 |  |  | 438.5 |  |  |  | 1,434.8 | 1,310.7 |
Phenolics and allylics | Epoxy Segment |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 345.6 |  |  | 227.1 |  |  |  | 891.8 | 759.1 |
Epoxy resins | Epoxy Segment |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 301.7 |  |  | 262.8 |  |  |  | 902.6 | 790.4 |
Commercial | Winchester Segment |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | 118.2 |  |  | 128.8 |  |  |  | 335.3 | 364.2 |
Military and law enforcement | Winchester Segment |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Sales | $ 55.8 |  |  | $ 55.0 |  |  |  | $ 175.5 | $ 151.6 |

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