| Document and Entity Information | Sep. 11, 2019 |
| Cover [Abstract] | |
| Entity Registrant Name | Knowles Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0001587523 |
| Document Type | 8-K |
| Document Period End Date | Sep. 11, 2019 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36102 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | KN |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
