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SEGMENT AND RELATED INFORMATION - Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 330.6 | $ 319.3 | $ 313.0 | $ 302.5 | $ 295.6 | $ 290.2 | $ 297.7 | $ 286.8 | $ 1,265.4 | $ 1,170.3 | $ 1,243.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 5.1 | 5.3 | 5.9
Operating Income (Loss) | (26.4) |  |  |  |  |  |  |  | 71.3 | 27.7 | (3.5)
Assets | 551.4 |  |  |  | 566.1 |  |  |  | 551.4 | 566.1 | 710.1
Operating Segments | IPG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 791.8 | 715.6 | 698.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 3.9 | 3.6 | 3.8
Operating Income (Loss) |  |  |  |  |  |  |  |  | 69.6 | 34.3 | 43.7
Assets | 220.4 |  |  |  | 201.5 |  |  |  | 220.4 | 201.5 | 203.8
Operating Segments | ETG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 473.6 | 451.1 | 441.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.5 | 0.8 | 0.5
Operating Income (Loss) |  |  |  |  |  |  |  |  | 24.5 | 14.5 | 13.0
Assets | 188.0 |  |  |  | 165.2 |  |  |  | 188.0 | 165.2 | 140.5
Operating Segments | ETG - discontinued |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 0.0 |  |  |  | 109.4 |  |  |  | 0.0 | 109.4 | 166.4
Operating Segments | NATG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 97.8
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.6
Operating Income (Loss) |  |  |  |  |  |  |  |  | (0.6) | (2.8) | (38.2)
Assets | 13.6 |  |  |  | 6.9 |  |  |  | 13.6 | 6.9 | 151.6
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0.0 | 3.6 | 5.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.7 | 0.9 | 1.0
Operating Income (Loss) |  |  |  |  |  |  |  |  | (22.2) | (18.3) | (22.0)
Assets | $ 129.4 |  |  |  | $ 83.1 |  |  |  | $ 129.4 | $ 83.1 | $ 47.8

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