| Cover Page Cover Page | Jul. 22, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 22, 2021 |
| Entity Registrant Name | Enstar Group LTD |
| Entity File Number | 001-33289 |
| Entity Address, Address Line One | P.O. Box HM 2267 |
| Entity Address, Address Line Two | Windsor Place 3rd Floor |
| Entity Address, Address Line Three | 22 Queen Street |
| Entity Address, City or Town | Hamilton |
| Entity Address, Postal Zip Code | HM JX |
| Entity Address, Country | BM |
| City Area Code | 441 |
| Local Phone Number | 292-3645 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Incorporation, State or Country Code | D0 |
| Entity Central Index Key | 0001363829 |
| Amendment Flag | false |
| Common Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Ordinary shares, par value $1.00 per share |
| Trading Symbol | ESGR |
| Security Exchange Name | NASDAQ |
| Series D Preferred Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares, Each Representing a 1/1,000th Interest in a 7.00% Fixed-to-Floating Rate |
| Trading Symbol | ESGRP |
| Security Exchange Name | NASDAQ |
| Series E Preferred Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares, Each Representing a 1/1,000th Interest |
| Trading Symbol | ESGRO |
| Security Exchange Name | NASDAQ |
