Reserves - Narrative (Details)	12 Months Ended		36 Months Ended
Reserves - Narrative (Details)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2007
Universal Life and Annuity
Claims and Benefits Payable
Interest rates credited on annuities at guarantee rates	4.50%
Universal Life and Annuity \| Minimum
Claims and Benefits Payable
Interest rates credited on annuities at guarantee rates	3.50%
Universal Life and Annuity \| Maximum
Claims and Benefits Payable
Interest rates credited on annuities at guarantee rates	4.00%
Universal Life
Claims and Benefits Payable
Crediting interest rates at guaranteed rates	0.00%
Universal Life \| Minimum
Claims and Benefits Payable
Crediting interest rates at guaranteed rates	4.00%
Universal Life \| Maximum
Claims and Benefits Payable
Crediting interest rates at guaranteed rates	4.10%
Surrender charge grading period	20 years
Global Preneed \| Preneed life insurance
Claims and Benefits Payable
Future policy benefit increases tied to inflation	3.00%	3.00%	2.30%
Global Preneed \| Preneed life insurance \| Minimum
Claims and Benefits Payable
Interest rate assumption	4.70%	4.70%
Percentage of adverse deviation in interest and discount rate for preneed life insurance	0.20%	0.20%
Future policy benefit increases	0.00%	0.00%
Global Preneed \| Preneed life insurance \| Maximum
Claims and Benefits Payable
Interest rate assumption	7.30%	7.30%
Percentage of adverse deviation in interest and discount rate for preneed life insurance	0.50%	0.50%
Future policy benefit increases	7.00%	7.00%
Global Preneed \| Life insurance no longer offered \| Minimum
Claims and Benefits Payable
Discount rate	5.30%	5.30%
Period of grading of interest and discount rates	20 years	20 years
Global Preneed \| Life insurance no longer offered \| Maximum
Claims and Benefits Payable
Discount rate	7.50%	7.50%
Global Preneed \| Block of pre-1980 traditional life insurance business
Claims and Benefits Payable
Discount rate	8.80%	8.80%
Global Preneed \| Preneed annuities \| Minimum
Claims and Benefits Payable
Interest rate assumption	1.00%	1.00%
Withdrawal charge percentage		0.00%
Global Preneed \| Preneed annuities \| Maximum
Claims and Benefits Payable
Surrender charge grading period	7 years
Interest rate assumption	5.50%	5.50%
Withdrawal charge percentage		7.00%

UNION SECURITY INSURANCE CO S-1