Cover - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Oct. 26, 2021
Cover [Abstract]
Document Quarterly Report		true
Document Transition Report		false
Entity File Number		001-36102
Entity Registrant Name		Knowles Corporation
Entity Incorporation, State or Country Code		DE
Entity Tax Identification Number		90-1002689
Entity Address, Address Line One		1151 Maplewood Drive,
Entity Address, City or Town		Itasca,
Entity Address, State or Province		IL
Entity Address, Postal Zip Code		60143
City Area Code		(630)
Local Phone Number		250-5100
Title of 12(b) Security		Common stock, $0.01 par value per share
Trading Symbol		KN
Security Exchange Name		NYSE
Entity Current Reporting Status		Yes
Entity Interactive Data Current		Yes
Entity Filer Category		Large Accelerated Filer
Entity Small Business		false
Entity Emerging Growth Company		false
Entity Shell Company		false
Entity Common Stock, Shares Outstanding			92,345,471
Document Type		10-Q
Entity Central Index Key		0001587523
Current Fiscal Year End Date		--12-31
Document Period End Date	Sep. 30, 2021
Document Fiscal Period Focus		Q3
Amendment Flag		false
Document Fiscal Year Focus		2021