Debt Obligations - Narrative (Details)				1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 30, 2021 USD ($)	Feb. 23, 2021 USD ($)	Feb. 01, 2021 USD ($) $ / shares	May 31, 2021 USD ($)	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt					$ 100,000	$ 0	$ 12,500,000	$ 9,200,000
Repayments of long-term debt							454,800,000	155,300,000
Amortization of discount (premium) on investments, net							$ 0	$ (100,000)
DTV America’s Secured Notes | Sellers' Notes
Debt Instrument [Line Items]
Repurchased outstanding notes payable	$ 1,000,000
8.50% Senior Secured Notes, due 2026
Debt Instrument [Line Items]
Interest rate			100.00%
8.50% Senior Secured Notes, due 2026 | Non-Operating Corporate
Debt Instrument [Line Items]
Interest rate			8.50%		8.50%		8.50%
Repayments of long-term debt			$ 330,000,000
7.50% Convertible Senior Notes, due 2022 | Non-Operating Corporate
Debt Instrument [Line Items]
Face amount			$ 51,800,000
Interest rate			7.50%		7.50%		7.50%
Loss on extinguishment of debt			$ 5,400,000
Repayments of long-term debt			55,000,000
Amortization of discount (premium) on investments, net			5,300,000
Extinguishment of the bifurcated conversion option equity			7,700,000
11.50% Senior Secured Notes, due 2021 | Non-Operating Corporate
Debt Instrument [Line Items]
Interest rate					11.50%		11.50%
Loss on extinguishment of debt			4,500,000
7.50% Convertible Senior Notes, due 2026
Debt Instrument [Line Items]
Face amount			$ 12,300,000
Interest rate			100.00%
Amortization of discount (premium) on investments, net							$ (1,300,000)
Convertible notes, conversion ratio			0.2342971
Conversion price (in usd per share) | $ / shares			$ 4.27
Long-term debt, gross					$ 61,700,000		61,700,000
Unamortized premium					$ 10,900,000		$ 10,900,000
Share price (in usd per share) | $ / shares					$ 4.10		$ 4.10
Interest cost relating to contractual interest coupon							$ 2,600,000
7.50% Convertible Senior Notes, due 2026 | HC2 Broadcasting Holdings, Inc
Debt Instrument [Line Items]
Interest rate, effective percentage			3.21%
Debt issuance costs			$ 1,100,000
7.50% Convertible Senior Notes, due 2026 | Non-Operating Corporate
Debt Instrument [Line Items]
Interest rate					7.50%		7.50%
Amortization of discount (premium) on investments, net			$ (12,300,000)
LIBOR plus 5.75% Line of Credit | Non-Operating Corporate
Debt Instrument [Line Items]
Basis spread on variable rate		6.75%					5.75%
Term Loan | UMB Bank
Debt Instrument [Line Items]
Face amount				$ 110,000,000
Revolving Credit Facility | Revolving Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Face amount		$ 20,000,000		5,000,000
Revolving Credit Facility | UMB Bank
Debt Instrument [Line Items]
Face amount				$ 110,000,000
Interest rate				3.25%
Revolving Credit Facility | UMB Bank | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate				1.10%
Revolving Credit Facility | TWC Loan
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ 1,500,000
Minimum
Debt Instrument [Line Items]
Finance leases rate							2.00%
Minimum | LIBOR plus 5.75% Line of Credit | Non-Operating Corporate
Debt Instrument [Line Items]
Basis spread on variable rate		5.75%
Maximum
Debt Instrument [Line Items]
Finance leases rate							10.00%
Maximum | LIBOR plus 5.75% Line of Credit | Non-Operating Corporate
Debt Instrument [Line Items]
Basis spread on variable rate		6.75%