| Document and Entity Information | Oct. 09, 2019 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001712184 |
| Document Type | 8-K |
| Document Period End Date | Oct. 9, 2019 |
| Entity Registrant Name | LIBERTY LATIN AMERICA LTD. |
| Entity Incorporation State Country Code | D0 |
| Entity File Number | 001-38335 |
| Entity Tax Identification Number | 98-1386359 |
| Entity Address, Address Line One | Clarendon House |
| Entity Address, Address Line Two | 2 Church Street |
| Entity Address, City or Town | Hamilton |
| Entity Address, Postal Zip Code | HM 11 |
| Entity Address, Country | BM |
| City Area Code | (303) |
| Local Phone Number | 925-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Capital Unit, Class A [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A Shares, par value $0.01 per share |
| Trading Symbol | LILA |
| Security Exchange Name | NASDAQ |
| Common Class C [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class C Shares, par value $0.01 per share |
| Trading Symbol | LILAK |
| Security Exchange Name | NASDAQ |
