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Acquisition Acquisition - Schedule of Purchase Consideration and Net Asset Allocation (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 01, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Consideration Transferred [Abstract]        
Cash consideration paid to Audience shareholders and equity award holders   $ 61.6    
Business Net Assets Acquired [Abstract]        
Goodwill   $ 925.8 $ 914.7 $ 961.9
Audience, Inc.        
Consideration Transferred [Abstract]        
Cash consideration paid to Audience shareholders and equity award holders $ 61.6      
Fair value of shares of Knowles common stock issued to Audience shareholders and equity award holders 60.2      
Fair value of restricted stock units assumed 1.5      
Fair value of total consideration 123.3      
Business Net Assets Acquired [Abstract]        
Goodwill 47.8      
Cash 26.5      
Identified intangible assets 25.8      
Inventories 10.3      
Property, plant, and equipment 10.7      
Other assets 19.5      
Total liabilities and accruals (17.3)      
Fair value of total consideration $ 123.3