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Debt Obligations - Narrative (Details)
£ in Millions
1 Months Ended 6 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
GBP (£)
May 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
HC2 Broadcasting Holdings, Inc | Senior Notes            
Debt Instrument [Line Items]            
Additional borrowing capacity $ 700,000     $ 10,800,000 $ 7,500,000  
Revolving Credit Agreement            
Debt Instrument [Line Items]            
Face amount $ 15,000,000          
Basis spread on variable rate (as a percent) 6.75%          
Revolving Credit Facility | HC2 Broadcasting Holdings, Inc            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 5,000,000.0          
Revolving Credit Facility | HC2 Broadcasting Holdings, Inc | Senior Notes            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 10,000,000    
Marine Services | 7.49% Note, due 2020            
Debt Instrument [Line Items]            
Long-term debt   $ 21,600,000 £ 17.0     $ 14,000,000
Interest rate (as a percent)   7.49% 7.49%      
Energy | LIBOR plus 3.00% Term Loan due in 2023            
Debt Instrument [Line Items]            
Long-term debt   $ 28,000,000        
Life Sciences Segment | Notes payable due in 2019            
Debt Instrument [Line Items]            
Long-term debt   0       1,700,000
Broadcasting | Notes payable due in 2019            
Debt Instrument [Line Items]            
Long-term debt   $ 54,000,000       35,000,000
Interest rate (as a percent)   8.50% 8.50%      
LIBOR | Energy | LIBOR plus 3.00% Term Loan due in 2023            
Debt Instrument [Line Items]            
Long-term debt   $ 28,000,000       $ 0
Interest rate (as a percent)   3.00% 3.00%      
Basis spread on variable rate (as a percent)   3.00%