| Cover Statement | 6 Months Ended | 7 Months Ended |
| Jun. 30, 2019 | Jul. 24, 2019 | |
| Document Information [Line Items] | ||
| Document Period End Date | Jul. 24, 2019 | |
| Entity Registrant Name | Knowles Corporation | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-36102 | |
| Entity Tax Identification Number | 90-1002689 | |
| Entity Address, Address Line One | 1511 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 | |
| Title of 12(b) Security | Common stock, $0.01 par value per share | |
| Trading Symbol | KN | |
| Security Exchange Name | NYSE | |
| Entity Emerging Growth Company | false | |
| Entity Central Index Key | 0001587523 | |
| Document Fiscal Year Focus | 2019 | |
| Document Fiscal Period Focus | Q2 | |
| Document Type | 8-K | |
| Amendment Flag | false |
