| Cover Document | Mar. 01, 2020 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Mar. 1, 2020 |
| Entity Registrant Name | IHSÂ MARKIT LTD. |
| Entity Incorporation, State or Country Code | D0 |
| Entity File Number | 001-36495 |
| Entity Tax Identification Number | 98-1166311 |
| Entity Address, Address Line One | 4th Floor, Ropemaker Place |
| Entity Address, Address Line Two | 25 Ropemaker Street |
| Entity Address, City or Town | London |
| Entity Address, Country | GB |
| Entity Address, Postal Zip Code | EC2Y 9LY |
| Country Region | 44 |
| City Area Code | 20 |
| Local Phone Number | 7260 2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, $0.01 par value per share |
| Trading Symbol | INFO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001598014 |
| Amendment Flag | false |
