| Document and Entity Information | Oct. 22, 2019 |
| Cover [Abstract] | |
| Entity Tax Identification Number | 00-0000000 |
| Amendment Flag | false |
| Entity Central Index Key | 0001701040 |
| Document Type | 8-K |
| Document Period End Date | Oct. 22, 2019 |
| Entity Registrant Name | Cision Ltd. |
| Entity Incorporation State Country Code | E9 |
| Entity File Number | 000-38140 |
| Entity Address, Address Line One | 130 East Randolph Street |
| Entity Address, Address Line Two | 7th Floor |
| Entity Address, City or Town | Chicago |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60601 |
| City Area Code | (866) |
| Local Phone Number | 639-5087 |
| Written Communications | false |
| Soliciting Material | true |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Ordinary shares, par value $0.0001 per share |
| Trading Symbol | CISN |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
