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Acquisition Acquisition - Schedule of Purchase Consideration and Net Asset Allocation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2015
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consideration Transferred [Abstract]                          
Cash consideration paid to Audience shareholders and equity award holders                       $ 61.6  
Business Net Assets Acquired [Abstract]                          
Goodwill   $ 894.6       $ 925.8       $ 925.8 $ 894.6 925.8 $ 914.7
Revenues   240.6 $ 243.1 $ 190.3 $ 185.3 223.5 $ 246.7 $ 192.8 $ 186.6   859.3 849.6 915.0
Net (loss) earnings   $ 19.3 $ (7.6) $ (24.6) $ (29.4) $ (187.0) $ (14.9) $ (16.1) $ (15.8)   $ (42.3) $ (233.8) $ (87.0)
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 48.0                        
Cash 26.5                        
Inventories 25.8                        
Property, plant, and equipment 10.3                        
Other assets 10.7                        
Total liabilities and accruals (17.5)                        
Fair value of total consideration $ 123.3                        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Number of Shares for Unvested Equity Awards Assumed 461,371.00                        
Consideration transferred, enterprise value, net of cash and short-term investments $ 92.8                        
Revenues                   19.0      
Net (loss) earnings                   $ 31.6      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets $ 19.5                        
Fair Value Inputs, Discount Rate 27.00%