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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Fiscal Year Focus	2021
Fair value of SSARs that are exercisable	$ 21.9
Cash received by Knowles for exercise of stock options	25.6	$ 1.8	$ 9.8
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	1.2	0.0	0.0
SSARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of SSARs exercised	0.1	0.0	0.4
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received by Knowles for exercise of stock options	25.6	1.8	9.8
Aggregate intrinsic value of stock options exercised	$ 6.6	$ 0.4	$ 2.7

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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