Schedule II - Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Statement of Income Captions [Line Items]
NET EARNINGS	$ 202,764	$ 126,668	$ 240,767	$ 367,890	$ (106,423)	$ (10,832)	$ 8,244	$ (41,210)	$ 938,089	$ (150,221)	$ 311,458
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSTAR GROUP LIMITED									934,820	(150,248)	345,474
Enstar Group Limited
Condensed Statement of Income Captions [Line Items]
NET EARNINGS									938,089	(150,221)	311,458
OTHER COMPREHENSIVE INCOME (LOSS) RELATING TO SUBSIDIARIES, NET OF TAX									(3,269)	(27)	34,016
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSTAR GROUP LIMITED									$ 934,820	$ (150,248)	$ 345,474