Organization and Business (Details) - segment	6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	May 12, 2020	Oct. 30, 2019
Business And Organization [Line Items]
Number of reportable segments	4
DBMG
Business And Organization [Line Items]
Parents interest, controlling	92.00%
Genoval Orthopedics inc.
Business And Organization [Line Items]
Parents interest, controlling	80.00%
R2 Dermatology, Inc.
Business And Organization [Line Items]
Parents interest, controlling	51.00%
Medibeacon Inc., and Triple Ring Technologies, Inc
Business And Organization [Line Items]
Parents interest, controlling	47.00%
HC2 Broadcasting Holdings, Inc
Business And Organization [Line Items]
Parents interest, controlling	98.00%
DTV America
Business And Organization [Line Items]
Parents interest, controlling	76.00%	60.00%
Minority Holders
Business And Organization [Line Items]
Percentage of proxy and voting rights from minority holders	15.00%	10.00%
Insurance Companies
Business And Organization [Line Items]
Parents interest, controlling	100.00%
Marine Services
Business And Organization [Line Items]
Parents interest, controlling	73.00%		30.00%	49.00%
HMN
Business And Organization [Line Items]
Parents interest, controlling	19.00%