| Cover | Jan. 04, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 04, 2024 |
| Entity File Number | 001-39071 |
| Entity Registrant Name | ADC Therapeutics SA |
| Entity Central Index Key | 0001771910 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | V8 |
| Entity Address, Address Line One | Biopôle |
| Entity Address, Address Line Two | Route de la Corniche 3B |
| Entity Address, City or Town | Epalinges |
| Entity Address, Country | CH |
| Entity Address, Postal Zip Code | 1066 |
| Country Region | +41 |
| City Area Code | 21 |
| Local Phone Number | 653 02 00 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, par value CHF 0.08 per share |
| Trading Symbol | ADCT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
