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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2022    
Cash received by Knowles for exercise of stock options $ 7.5 $ 25.6 $ 1.8
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 1.2 1.2 0.0
SSARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value of SSARs exercised 0.1 0.1 0.0
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash received by Knowles for exercise of stock options 7.5 25.6 1.8
Aggregate intrinsic value of stock options exercised $ 6.0 $ 6.6 $ 0.4