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Equity Incentive Program Equity Incentive Program - Other Information Regarding SSARs and Stock Options (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2018    
Cash received by Knowles for exercise of stock options $ 0.5 $ 3.3 $ 0.0
SSARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of SSARs that are exercisable 1.8 1.9 1.9
Aggregate intrinsic value of SSARs exercised 0.1 0.2 0.1
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash received by Knowles for exercise of stock options 0.5 3.3 0.0
Aggregate intrinsic value of options exercised $ 0.2 $ 1.1 $ 0.0