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SEGMENT AND RELATED INFORMATION - Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 217.7 | $ 235.8 | $ 231.2 | $ 212.2 | $ 194.5 | $ 204.4 | $ 202.7 | $ 190.2 | $ 896.9 | $ 791.8 | $ 753.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 4.5 | 4.6 | 4.5
Operating Income (Loss) |  |  |  |  |  |  |  |  | 61.7 | 45.7 | 8.0
Assets | 530.0 |  |  |  | 551.4 |  |  |  | 530.0 | 551.4 | 566.1
Operating Segments | IPG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 896.9 | 791.8 | 715.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 3.9 | 3.9 | 3.6
Operating Income (Loss) |  |  |  |  |  |  |  |  | 82.6 | 69.6 | 34.3
Assets | 234.7 |  |  |  | 220.4 |  |  |  | 234.7 | 220.4 | 201.5
Operating Segments | ETG - discontinued |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 0.0 |  |  |  | 185.3 |  |  |  | 0.0 | 185.3 | 269.4
Operating Segments | NATG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (0.8) | (0.6) | (2.8)
Assets | 8.9 |  |  |  | 13.6 |  |  |  | 8.9 | 13.6 | 6.9
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 37.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.6 | 0.7 | 0.9
Operating Income (Loss) |  |  |  |  |  |  |  |  | (20.1) | (23.3) | (23.5)
Assets | $ 286.4 |  |  |  | $ 132.1 |  |  |  | $ 286.4 | $ 132.1 | $ 88.3

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