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SEGMENT AND RELATED INFORMATION - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 30, 2018 segment | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment | 2 |  |  |  |  |  |  |  |  | 1 |  |
Net sales |  | $ 217.7 | $ 235.8 | $ 231.2 | $ 212.2 | $ 194.5 | $ 204.4 | $ 202.7 | $ 190.2 | $ 896.9 | $ 791.8 | $ 753.1
Net loss from continuing operations |  | $ (12.3) | $ (15.1) | $ (13.4) | $ (8.7) | $ (32.6) | $ (11.3) | $ (15.2) | $ (6.4) | (49.5) | (65.5) | (3.9)
Special charges, net |  |  |  |  |  |  |  |  |  | 0.8 | 0.3 | 3.9
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | 37.5
Continuing Operations | Operating Segments | ETG |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 33.9
Net loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  | 4.7
Special charges, net |  |  |  |  |  |  |  |  |  |  |  | 1.7
Rebate Processing Business | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 3.6
Net loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  | 2.2
Gain on disposition |  |  |  |  |  |  |  |  |  |  |  | $ 3.9

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