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Restructuring and Related Activities - Restructuring Activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges $ 2.1 $ 10.2 $ 10.1
Document Fiscal Year Focus 2018    
Restructuring Reserve, Accrual Adjustment $ 1.2    
Restructuring Reserve [Roll Forward]      
Beginning balance 5.1 2.8 8.8
Restructuring charges 2.1 10.2 10.1
Payments (6.0) (8.3) (16.1)
Other, including foreign currency (0.1) 0.4  
Ending balance 1.1 5.1 2.8
Severance Pay and Benefits      
Restructuring Reserve [Roll Forward]      
Beginning balance 4.7 2.4 7.7
Restructuring charges 2.1 8.4 7.5
Payments (5.9) (6.5) (12.8)
Other, including foreign currency (0.1) 0.4  
Ending balance 0.8 4.7 2.4
Facility Closing [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 0.4 0.4 1.1
Restructuring charges 0.0 1.8 2.6
Payments (0.1) (1.8) (3.3)
Other, including foreign currency 0.0 0.0  
Ending balance 0.3 0.4 0.4
Corporate, Non-Segment [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges 0.2 2.0 1.6
Audio      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges 1.4 8.1 7.1
Precision Devices      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges 0.5 0.1 1.4
Restructuring Charges [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring charges 1.7 6.2 8.6
Cost of Goods Sold, Restructuring Charges [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring charges $ 0.4 $ 4.0 $ 1.5