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SEGMENT AND RELATED INFORMATION - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |
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
Net income from continuing operations | $ 32.4 | $ 14.1 | $ 19.3 | $ 10.3 | $ 11.5 | $ 1.6 | $ 2.3 | $ 1.5 | 76.1 | 16.9 | (24.0)
Special charges, net |  |  |  |  |  |  |  |  | 0.3 | 3.9 | 26.9
Operating Segments | ETG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 473.6 | 451.1 | 441.7
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 0.0 | 3.6 | $ 5.4
Continuing Operations | Operating Segments | ETG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 33.9 |
Net income from continuing operations |  |  |  |  |  |  |  |  |  | (6.4) |
Special charges, net |  |  |  |  |  |  |  |  |  | 1.7 |
Continuing Operations | Intercompany | ETG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  |  |  |  |  |  |  |  |  | 1.7 |
Rebate Processing Business | Intercompany |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  |  |  |  |  |  |  |  |  | (0.1) |
Rebate Processing Business | Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 3.6 |
Net income from continuing operations |  |  |  |  |  |  |  |  |  | (2.3) |
Gain on disposition |  |  |  |  |  |  |  |  |  | $ 3.9 |

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