Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 07, 2022	Jun. 30, 2021
Cover [Abstract]
Title of 12(b) Security	Common stock, $0.01 par value per share
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	90-1002689
Entity Address, Address Line One	1151 Maplewood Drive,
Document Annual Report	true
Entity Address, City or Town	Itasca
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60143
Trading Symbol	KN
Security Exchange Name	NYSE
Document Transition Report	false
City Area Code	630
Document Period End Date	Dec. 31, 2021
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Local Phone Number	250-5100
Entity File Number	001-36102
Entity Registrant Name	Knowles Corporation
Entity Central Index Key	0001587523
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Public Float			$ 1,791,000,000
Entity Common Stock, Shares Outstanding		91,813,002
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false