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Debt Obligations - Narrative (Details)					3 Months Ended		6 Months Ended
	May 31, 2021 USD ($)	May 27, 2021 USD ($)	Feb. 23, 2021 USD ($)	Feb. 01, 2021 USD ($) $ / shares	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt					$ 1,600,000	$ 3,400,000	$ 12,400,000	$ 9,200,000
Repayments of long-term debt							$ 446,100,000	$ 154,200,000
UMB Bank | Term Loan
Debt Instrument [Line Items]
Face amount	$ 110,000,000.0
UMB Bank | Revolving Credit Facility
Debt Instrument [Line Items]
Face amount	$ 110,000,000.0
Interest rate	3.25%
UMB Bank | Revolving Credit Facility | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.10%
TWC Loan | Revolving Credit Facility
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 1,600,000
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]
Repayments of long-term debt				$ 330,000,000.0
Interest rate				8.50%	8.50%		8.50%
7.50% Convertible Senior Notes, due 2022 | Non-Operating Corporate
Debt Instrument [Line Items]
Face amount				$ 51,800,000
Loss on extinguishment of debt				5,400,000
Repayments of long-term debt				$ 55,000,000.0
Interest rate				7.50%	7.50%		7.50%
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]
Loss on extinguishment of debt				4,500,000
Interest rate					11.50%		11.50%
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							$ 800,000
Convertible notes, conversion ratio				0.2342971
Conversion price (in usd per share) | $ / shares				$ 4.27
Long-term debt, gross					$ 62,200,000		62,200,000
Unamortized premium					$ 11,400,000		$ 11,400,000
Share price (in usd per share) | $ / shares					$ 3.98		$ 3.98
Interest cost relating to contractual interest coupon							$ 1,600,000
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%
Revolving Credit Agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Face amount	$ 5,000,000.0		$ 20,000,000.0
HC2 Broadcasting Holdings, Inc | 7.50% Convertible Senior Notes, due 2026
Debt Instrument [Line Items]
Interest rate, effective percentage				3.21%
Debt issuance costs				$ 1,100,000
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%

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