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Debt Obligations - Insurance and Broadcasting (Details) - USD ($)
9 Months Ended
Aug. 07, 2018
May 07, 2018
Sep. 30, 2018
Sep. 30, 2017
Jul. 31, 2018
Feb. 06, 2018
Feb. 04, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                
Loss on extinguishment of debt     $ (2,537,000) $ 0        
Other financing activities     (835,000) $ (230,000)        
Broadcasting                
Debt Instrument [Line Items]                
Other financing activities $ 38,100,000              
HC2 Station And HC2LPTV | Secured Debt                
Debt Instrument [Line Items]                
Aggregate principal amount $ 35,000,000.0              
Debt instrument, term 364 days              
Interest rate (as a percent) 8.50%              
The Bridge Loan | HC2 Broadcasting Holdings, Inc | Bridge Loan                
Debt Instrument [Line Items]                
Outstanding debt           $ 42,000,000    
Aggregate principal amount   $ 102,000,000.0         $ 75,000,000.0  
Loan increase             $ 27,000,000.0  
Loss on extinguishment of debt   $ (2,500,000)            
Senior Notes Due 2019 | Broadcasting                
Debt Instrument [Line Items]                
Outstanding debt     $ 35,000,000         $ 0
Interest rate (as a percent)     8.50%          
Surplus Note                
Debt Instrument [Line Items]                
Outstanding debt         $ 32,000,000