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Equity Incentive Program Equity Incentive Program - Other Information Regarding SSARs and Stock Options (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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