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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