| Cover | Dec. 20, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 20, 2023 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 333-273360 |
| Entity Registrant Name | ARCADIUM LITHIUM PLC |
| Entity Central Index Key | 0001977303 |
| Entity Tax Identification Number | 98-1737136 |
| Entity Incorporation, State or Country Code | Y9 |
| Entity Address, Address Line One | Suite 12, Gateway Hub |
| Entity Address, Address Line Two | Shannon Airport House |
| Entity Address, City or Town | Shannon |
| Entity Address, Country | IE |
| Entity Address, Postal Zip Code | V14 E370 |
| Country Region | 353 |
| City Area Code | 1 |
| Local Phone Number | 6875238 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
