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Restructuring and Related Activities - Costs Recognized and Remaining Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 11.8 $ 14.3 $ 7.6
Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 10.3   (0.1)
Cost of Goods Sold, Restructuring Charges [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 1.5   7.7
Severance Pay and Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   13.4 6.9
Severance Pay and Benefits | Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 9.2    
Facility Closing [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   0.9 $ 0.7
Facility Closing [Member] | Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 2.6    
Audience, Inc. | Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   9.5  
Audience, Inc. | Severance Pay and Benefits | Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   9.0  
Audience, Inc. | Facility Closing [Member] | Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   0.5  
Other Restructuring Actions      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   4.8  
Other Restructuring Actions | Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   2.1  
Other Restructuring Actions | Cost of Goods Sold, Restructuring Charges [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   2.7  
Other Restructuring Actions | Severance Pay and Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   4.4  
Other Restructuring Actions | Contract Termination and Other Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 0.4  
Minimum      
Restructuring Cost and Reserve [Line Items]      
Finite-lived intangible asset, useful life 5 years    
Minimum | Patents      
Restructuring Cost and Reserve [Line Items]      
Finite-lived intangible asset, useful life 7 years