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Cover page - USD ($) $ in Millions	12 Months Ended
Cover page - USD ($) $ in Millions	Dec. 31, 2019	Feb. 24, 2020	Jun. 30, 2019
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Entity File Number	001-33289
Entity Registrant Name	Enstar Group LTD
Entity Incorporation, State or Country Code	D0
Entity Address, Address Line One	Windsor Place
Entity Address, Address Line Two	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
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Public Float			$ 1,860
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A relating to its 2020 annual general meeting of shareholders are incorporated by reference in Part III of this Form 10-K.
Entity Central Index Key	0001363829
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Ordinary Shares
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 Shares
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, Each Representing a 1/1,000th Interest in a 7.00%
Trading Symbol	ESGRP
Security Exchange Name	NASDAQ
Series E Preferred Shares
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, Each Representing a 1/1,000th Interest in a 7.00%
Trading Symbol	ESGRO
Security Exchange Name	NASDAQ
Voting ordinary shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		18,012,556
Non-voting ordinary shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,509,682