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Segment Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segments
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]          
Assets $ 1,516.5   $ 1,516.5   $ 1,515.0
Document Fiscal Year Focus     2017    
Number of reportable segments | segments     2    
Reconciliation from Segment Totals to Consolidated [Abstract]          
Revenues 190.2 $ 190.3 $ 383.9 $ 375.6  
Reconciliation of Net Earnings from Segments [Abstract]          
Interest expense, net 5.1 5.8 10.3 9.5  
Loss before income taxes and discontinued operations (23.0) (5.4) (27.9) (15.5)  
(Benefit from) provision for income taxes 7.3 1.4 7.1 3.8  
Loss from continuing operations (30.3) (6.8) (35.0) (19.3)  
Assets of discontinued operations 0.7   0.7   0.9
Operating Segments          
Reconciliation of Net Earnings from Segments [Abstract]          
(Loss) earnings before interest and income taxes (1.2) 12.1 13.2 19.1  
Operating Segments | Audio          
Segment Reporting Information [Line Items]          
Assets 1,336.9   1,336.9   1,349.1
Reconciliation from Segment Totals to Consolidated [Abstract]          
Revenues 138.1 140.3      
Reconciliation of Net Earnings from Segments [Abstract]          
(Loss) earnings before interest and income taxes (7.1) 8.4      
Operating Segments | Mobile Consumer Electronics [Member]          
Reconciliation from Segment Totals to Consolidated [Abstract]          
Revenues     282.3 278.2  
Reconciliation of Net Earnings from Segments [Abstract]          
(Loss) earnings before interest and income taxes     1.8 14.1  
Operating Segments | Precision Devices          
Segment Reporting Information [Line Items]          
Assets 175.5   175.5   162.9
Reconciliation from Segment Totals to Consolidated [Abstract]          
Revenues 52.1 50.0      
Reconciliation of Net Earnings from Segments [Abstract]          
(Loss) earnings before interest and income taxes 5.9 3.7      
Operating Segments | Specialty Components [Member]          
Reconciliation from Segment Totals to Consolidated [Abstract]          
Revenues     101.6 97.4  
Reconciliation of Net Earnings from Segments [Abstract]          
(Loss) earnings before interest and income taxes     11.4 5.0  
Corporate          
Reconciliation of Net Earnings from Segments [Abstract]          
Corporate expense / other 16.7 11.7 30.8 25.1  
Segment Reconciling Items          
Reconciliation of Net Earnings from Segments [Abstract]          
Interest expense, net (5.1) $ (5.8) (10.3) $ (9.5)  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Assets $ 3.4   $ 3.4   $ 2.1