INNOVATE (VATE) 10-Q 6 Aug 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-35210
Entity Registrant Name	HC2 HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	54-1708481
Entity Address, Address Line One	295 Madison Avenue
Entity Address, Address Line Two	12th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	212
Local Phone Number	235-2690
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	HCHC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		77,819,782
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001006837
Current Fiscal Year End Date	--12-31

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue	$ 243.8	$ 181.8	$ 415.6	$ 368.4
Cost of revenue	207.4	152.1	348.7	308.9
Gross profit	36.4	29.7	66.9	59.5
Operating expenses:
Selling, general and administrative	39.5	36.4	76.6	75.3
Depreciation and amortization	4.8	4.5	8.7	8.8
Other operating (income) loss	(0.2)	(2.3)	0.2	(2.1)
Loss from operations	(7.7)	(8.9)	(18.6)	(22.5)
Other (expense) income:
Interest expense	(12.4)	(19.1)	(33.8)	(38.3)
Loss on early extinguishment or restructuring of debt	(1.6)	(3.4)	(12.4)	(9.2)
Income (loss) from equity investees	0.2	(0.2)	(1.9)	(2.7)
Other income	0.4	64.6	3.8	66.1
(Loss) income from continuing operations before income taxes	(21.1)	33	(62.9)	(6.6)
Income tax expense	(2.6)	(12)	(3.7)	(2.3)
(Loss) income from continuing operations	(23.7)	21	(66.6)	(8.9)
(Loss) income from discontinued operations (including gain on disposal of $40.4 million and loss on disposal of $39.3 million for the six months ended June 30, 2021 and 2020, respectively)	(1.5)	7.5	50.4	(63.6)
Net (loss) income	(25.2)	28.5	(16.2)	(72.5)
Net income (loss) attributable to noncontrolling interest and redeemable noncontrolling interest	1.7	(15.4)	5.3	2.5
Net (loss) income attributable to HC2 Holdings, Inc.	(23.5)	13.1	(10.9)	(70)
Less: Preferred dividends and deemed dividends from conversions	0.2	0.4	0.6	0.8
Net (loss) income attributable to common stock and participating preferred stockholders	$ (23.7)	$ 12.7	$ (11.5)	$ (70.8)
(Loss) income per common share - continuing operations
Basic (in usd per share)	$ (0.29)	$ 0.11	$ (0.82)	$ (0.48)
Diluted (in usd per share)	(0.29)	0.11	(0.82)	(0.48)
(Loss) income per common share - discontinued operations
Basic (in usd per share)	(0.02)	0.15	0.67	(1.06)
Diluted (in usd per share)	(0.02)	0.14	0.67	(1.06)
(Loss) income per share - Net (loss) income attributable to common stock and participating preferred stockholders
Basic (in usd per share)	(0.31)	0.26	(0.15)	(1.54)
Diluted (in usd per share)	$ (0.31)	$ 0.25	$ (0.15)	$ (1.54)
Weighted average common shares outstanding:
Basic (in shares)	77	46.8	77.1	45.9
Diluted (in shares)	77	48.8	77.1	45.9

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Gain (loss) on sale of subsidiary	$ 40.4	$ (39.3)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (25.2)	$ 28.5	$ (16.2)	$ (72.5)
Other comprehensive income (loss)
Foreign currency translation adjustment	(0.4)	3.8	(1.2)	4
Unrealized income (loss) on available-for-sale securities	123.5	283.8	(57.7)	7.8
Dispositions	0	(0.7)	0	22.1
Other comprehensive income (loss)	123.1	286.9	(58.9)	33.9
Comprehensive income (loss)	97.9	315.4	(75.1)	(38.6)
Comprehensive (loss) income attributable to noncontrolling interests and redeemable noncontrolling interests	(1.7)	16.2	(5.4)	7.3
Comprehensive income (loss) attributable to HC2 Holdings, Inc.	$ 96.2	$ 331.6	$ (80.5)	$ (31.3)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 18.1	$ 43.8
Accounts receivable, net	364.6	184.7
Costs and recognized earnings in excess of billings on uncompleted contracts	63.7	55.6
Assets held for sale	5,812.4	5,942.1
Other current assets	28.9	20.1
Total current assets	6,287.7	6,246.3
Investments	53.1	55.4
Deferred tax asset	2	3
Property, plant and equipment, net	173.3	112.8
Goodwill	121.1	111
Intangibles, net	222	172.1
Other assets	76.7	42.2
Total assets	6,935.9	6,742.8
Current liabilities
Accounts payable	135.1	69.7
Accrued liabilities	101.9	77.1
Current portion of debt obligations	70.2	433.6
Billings in excess of costs and recognized earnings on uncompleted contracts	146.8	52.2
Liabilities held for sale	5,261.6	5,306.7
Other current liabilities	18.7	12.9
Total current liabilities	5,734.3	5,952.2
Deferred tax liability	7	7
Debt obligations	606.3	127.9
Other liabilities	70.6	39.8
Total liabilities	6,418.2	6,126.9
Commitments and contingencies
Temporary equity
Preferred stock	0	10.4
Redeemable noncontrolling interest	6.2	5.3
Total temporary equity	6.2	15.7
Stockholders’ equity
Common stock	0.1	0.1
Additional paid-in capital	354.8	355.7
Treasury stock, at cost: 1,385,056 and 1,109,751 shares at June 30, 2021 and December 31, 2020, respectively	(5.2)	(4.2)
Accumulated deficit	(199.6)	(188.7)
Accumulated other comprehensive income	338.2	396.9
Total HC2 Holdings, Inc. stockholders’ equity	488.3	559.8
Noncontrolling interest	23.2	40.4
Total stockholders’ equity	511.5	600.2
Total liabilities, temporary equity and stockholders’ equity	$ 6,935.9	$ 6,742.8

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	79,208,998	77,836,586
Common stock, shares outstanding (in shares)	77,823,942	76,726,835
Treasury stock (in shares)	1,385,056	1,109,751

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Total HC2 Stockholders' Equity	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Non- controlling Interest
Beginning balance (in shares) at Dec. 31, 2019			46.1
Beginning balance at Dec. 31, 2019	$ 443.6	$ 349.8	$ 0	$ 281.1	$ (3.3)	$ (96.7)	$ 168.7	$ 93.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2.9	2.9		2.9
Fair value adjustment of redeemable noncontrolling interest	(1.2)	(1.2)		(1.2)
Taxes paid in lieu of shares issued for share-based compensation (in shares)			(0.4)
Taxes paid in lieu of shares issued for share-based compensation	(0.9)	(0.9)			(0.9)
Preferred stock dividend	(0.4)	(0.4)		(0.4)
Issuance of common stock (in shares)			0.9
Issuance of common stock	0	0
Transactions with noncontrolling interests	(49.2)	6.1		6.1				(55.3)
Net loss (loss)	(71)	(70)				(70)		(1)
Other comprehensive income (loss)	41.4	33					33	8.4
Ending balance (in shares) at Jun. 30, 2020			46.6
Ending balance at Jun. 30, 2020	365.2	319.3	$ 0	288.5	(4.2)	(166.7)	201.7	45.9
Beginning balance at Dec. 31, 2019	21.6
Increase (Decrease) in Temporary Equity [Roll Forward]
Fair value adjustment of redeemable noncontrolling interest	1.2
Transactions with noncontrolling interests	(4)
Net income (loss)	(1.5)
Other comprehensive income	1.4
Ending balance at Jun. 30, 2020	18.7
Beginning balance (in shares) at Mar. 31, 2020			46.5
Beginning balance at Mar. 31, 2020	60.5	14.1	$ 0	282.7	(4.2)	(179.8)	(84.6)	46.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	0.3	0.3		0.3
Preferred stock dividend	(0.2)	(0.2)		(0.2)
Issuance of common stock (in shares)			0.1
Issuance of common stock	0	0		0
Transactions with noncontrolling interests	(12.4)	2.8		2.8				(15.2)
Net loss (loss)	27.1	13.1				13.1		14
Other comprehensive income (loss)	287	286.3					286.3	0.7
Ending balance (in shares) at Jun. 30, 2020			46.6
Ending balance at Jun. 30, 2020	365.2	319.3	$ 0	288.5	(4.2)	(166.7)	201.7	45.9
Beginning balance at Mar. 31, 2020	18.6
Increase (Decrease) in Temporary Equity [Roll Forward]
Fair value adjustment of redeemable noncontrolling interest	(2.9)
Transactions with noncontrolling interests	1.5
Net income (loss)	1.4
Other comprehensive income	0.1
Ending balance at Jun. 30, 2020	18.7
Beginning balance (in shares) at Dec. 31, 2020			76.7
Beginning balance at Dec. 31, 2020	600.2	559.8	$ 0.1	355.7	(4.2)	(188.7)	396.9	40.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1.3	1.3		1.3
Fair value adjustment of redeemable noncontrolling interest	(0.3)	(0.3)		(0.3)
Taxes paid in lieu of shares issued for share-based compensation	(1)	(1)			(1)
Preferred stock dividend	(0.3)	(0.3)		(0.3)
Issuance of common stock (in shares)			1.1
Issuance of common stock	0.7	0.7		0.7
Purchase of preferred stock by subsidiary	(0.2)	(0.2)		(0.2)
Transactions with noncontrolling interests	(14.2)	0.8		0.8				(15)
Other	(2.9)	(2.9)		(2.9)
Net loss (loss)	(13)	(10.9)				(10.9)		(2.1)
Other comprehensive income (loss)	(58.8)	(58.7)					(58.7)	(0.1)
Ending balance (in shares) at Jun. 30, 2021			77.8
Ending balance at Jun. 30, 2021	511.5	488.3	$ 0.1	354.8	(5.2)	(199.6)	338.2	23.2
Beginning balance at Dec. 31, 2020	15.7
Increase (Decrease) in Temporary Equity [Roll Forward]
Fair value adjustment of redeemable noncontrolling interest	0.3
Redemption of Series A and A-2 Preferred Stock	(10.4)
Transactions with noncontrolling interests	3.8
Net income (loss)	(3.2)
Ending balance at Jun. 30, 2021	6.2
Beginning balance (in shares) at Mar. 31, 2021			77.6
Beginning balance at Mar. 31, 2021	413.5	389.6	$ 0.1	355.7	(5.2)	(176.1)	215.1	23.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	0.6	0.6		0.6
Fair value adjustment of redeemable noncontrolling interest	(0.1)	(0.1)		(0.1)
Preferred stock dividend	(0.1)	(0.1)		(0.1)
Issuance of common stock (in shares)			0.2
Issuance of common stock	0.5	0.5		0.5
Purchase of preferred stock by subsidiary	(0.2)	(0.2)		(0.2)
Transactions with noncontrolling interests	(2.1)	(1.6)		(1.6)				(0.5)
Net loss (loss)	(23.7)	(23.5)				(23.5)		(0.2)
Other comprehensive income (loss)	123.1	123.1					123.1	0
Ending balance (in shares) at Jun. 30, 2021			77.8
Ending balance at Jun. 30, 2021	511.5	$ 488.3	$ 0.1	$ 354.8	$ (5.2)	$ (199.6)	$ 338.2	$ 23.2
Beginning balance at Mar. 31, 2021	18
Increase (Decrease) in Temporary Equity [Roll Forward]
Fair value adjustment of redeemable noncontrolling interest	0.1
Redemption of Series A and A-2 Preferred Stock	(10.4)
Transactions with noncontrolling interests	0
Net income (loss)	(1.5)
Ending balance at Jun. 30, 2021	$ 6.2

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net loss	$ (16.2)	$ (72.5)
Less: Income (loss) from discontinued operations, net of tax	50.4	(63.6)
(Loss) income from continuing operations	(66.6)	(8.9)
Adjustments to reconcile net loss to cash provided by operating activities
Share-based compensation expense	1.3	1.7
Depreciation and amortization	13.8	13.4
Amortization of deferred financing costs and debt discount	8.3	7
Loss on extinguishment of debt	12.4	9.2
Loss from equity investees	1.9	2.7
Asset impairment expense	2.2	0.1
Net realized and unrealized gains on investments	0	(72.5)
Deferred income taxes	1.3	0
Other operating activities	(4.6)	1.2
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(67.9)	23.3
Costs and recognized earnings in excess of billings on uncompleted contracts	(6.1)	(7.2)
Other current assets	0.5	(8.2)
Other assets	5.5	3.1
Accounts payable	24.6	6.5
Accrued liabilities	25.3	12
Billings in excess of costs and recognized earnings on uncompleted contracts	39.6	17.5
Other current liabilities	(26)	(17.1)
Other liabilities	(0.2)	8.1
Cash used in operating activities	(34.7)	(8.1)
Cash provided by discontinued operating activities	34.3	55.9
Cash (used in) provided by continuing operating activities	(0.4)	47.8
Cash flows from investing activities
Purchase of property, plant and equipment	(8)	(10)
Proceeds from disposal of property, plant and equipment	1.1	0.6
Sale of investments	0	85.5
Cash received from dispositions, net of cash disposed	71.2	144
Cash paid for acquisitions, net of cash acquired	(128.5)	0
Other investing activities	1.4	3.5
Cash (used in) provided by investing activities	(62.8)	223.6
Cash (used in) provided by discontinued investing activities	31.6	(84.7)
Cash (used in) provided by continuing investing activities	(31.2)	138.9
Cash flows from financing activities
Proceeds from debt obligations	528.2	(0.7)
Principal payments on debt obligations	(446.1)	(154.2)
Cash received by subsidiary to issue preferred stock	10	10
Redemption of preferred stock	(10.4)	0
Transactions with noncontrolling interests	(6.9)	(62.1)
Other financing activities	(1.2)	(4.2)
Cash (used in) provided by financing activities	73.6	(211.2)
Cash (used in) provided by discontinued financing activities	(7.6)	(11.4)
Cash (used in) provided by continuing financing activities	66	(222.6)
Effects of exchange rate changes on cash, cash equivalents and restricted cash	(0.7)	0.6
Net increase (decrease) in cash and cash equivalents, including cash classified within assets held for sale	33.7	(35.3)
Less: Net increase (decrease) in cash and cash equivalents from discontinued operations	58.3	(35.7)
Net change in cash, cash equivalents and restricted cash	(24.6)	0.4
Cash, cash equivalents and restricted cash, beginning of period	45.3	24.7
Cash, cash equivalents and restricted cash, end of period	$ 20.7	$ 25.1

Organization and Business

Organization and Business	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	1. Organization and Business HC2 Holdings, Inc. ("HC2" and, together with its consolidated subsidiaries, the "Company", "we" and "our") is a diversified holding company that has a portfolio of subsidiaries in a variety of operating segments. We seek to grow these businesses so that they can generate long-term sustainable free cash flow and attractive returns in order to maximize value for all stakeholders. While the Company generally intends to acquire controlling equity interests in its operating subsidiaries, the Company may invest to a limited extent in a variety of debt instruments or noncontrolling equity interest positions. The Company’s shares of common stock trade on the NYSE under the symbol "HCHC". The Company currently has four reportable segments, plus our Other segment, based on management’s organization of the enterprise- Infrastructure, Life Sciences, Spectrum, Insurance, and Other which includes businesses that do not meet the separately reportable segment thresholds. 1. Our Infrastructure segment is comprised of DBM Global Inc. ("DBMG") and its wholly-owned subsidiaries. DBMG is a fully integrated Industrial Construction, Structural Steel and Facility Maintenance provider that provides fabrication and erection of structural steel and heavy steel plate services and also fabricates trusses and girders and specializes in the fabrication and erection of large-diameter water pipe and water storage tanks, as well as 3-D Building Information Modeling (“BIM”) and detailing. DBMG provides these services on commercial, industrial, and infrastructure construction projects such as high- and low-rise buildings and office complexes, hotels and casinos, convention centers, sports arenas and stadiums, shopping malls, hospitals, dams, bridges, mines, metal processing, refineries, pulp and paper mills and power plants. Through GrayWolf, DBMG provides integrated solutions for digital engineering, modeling and detailing, construction, heavy equipment installation and facility services including maintenance, repair, and installation to a diverse range of end markets. Through Aitken Manufacturing, DBMG manufactures pollution control scrubbers, tunnel liners, pressure vessels, strainers, filters, separators and a variety of customized products. Through the recently acquired Banker Steel, DBMG provides fabricated structural steel and erection services primarily for the East Coast and Southeast commercial and industrial construction market. The Company maintains an approximately 92% controlling interest in DBMG. 2. Our Life Sciences segment is comprised of Pansend Life Sciences, LLC ("Pansend"). Pansend maintains controlling interests of approximately 80% in Genovel Orthopedics, Inc. ("Genovel"), which seeks to develop products to treat early osteoarthritis of the knee and approximately 51% in R2 Technologies, Inc. ("R2"), which develops aesthetic and medical technologies for the skin. Pansend also invests in other early stage or developmental stage healthcare companies including an approximately 47% interest in MediBeacon Inc. ("MediBeacon"), and an investment in Triple Ring Technologies, Inc ("Triple Ring"). 3. Our Spectrum segment is comprised of HC2 Broadcasting Holdings Inc. ("HC2 Broadcasting") and its subsidiaries. HC2 Broadcasting strategically acquires and operates over-the-air broadcasting stations across the United States. In addition, HC2 Broadcasting, through its wholly-owned subsidiary, HC2 Network Inc. ("Network"), operates Azteca America, a Spanish-language broadcast network offering high quality Hispanic content to a diverse demographic across the United States. The Company maintains an approximately 98% controlling interest in HC2 Broadcasting and maintains a controlling interest of 76%, inclusive of approximately 15% proxy rights from minority holders of DTV America Corporation ("DTV"). 4. Our Insurance segment is comprised of the discontinued operations of Continental Insurance Group Ltd. ("CIG") and its wholly-owned subsidiaries Continental General Insurance Company ("CGI") and Continental LTC, Inc. CGI provides long-term care, life, annuity, and other accident and health coverage that help protect policy and certificate holders from the financial hardships associated with illness, injury, loss of life, or income continuation. The Company maintains a 100% interest in CIG which was sold subsequent to quarter end on July 1, 2021. 5. Our Other segment represents all other businesses or investments that do not meet the definition of a segment individually or in the aggregate. Included in the Other segment is the former Marine Services segment, which includes its holding company, Global Marine Holdings, LLC ("GMH"), in which the Company maintains approximately 73% controlling interest. GMH results include the current and prior year equity investment in Huawei Marine Networks Co., Limited (“HMN”), its 19% equity method investment with Huawei Technologies Co., Ltd., and the discontinued operations of Global Marine Systems Limited ("GMSL"). Also included in the Other segment is the discontinued operations of Beyond6, Inc. ("Beyond6") and PTGi International Carrier Services, Inc. and its subsidiaries ("ICS").

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Principles of Consolidation The Condensed Consolidated Financial Statements include the accounts of the Company, its wholly owned subsidiaries and all other subsidiaries over which the Company exerts control. All intercompany profits, transactions and balances have been eliminated in consolidation. As of June 30, 2021, the results of DBMG, Genovel, R2, HC2 Broadcasting, CIG, GMH and Beyond6 have been consolidated into the Company’s results based on guidance from the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC" 810, Consolidation) . The remaining interests not owned by the Company are presented as a noncontrolling interest component of total equity. Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of the Company included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). The financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair statement of such information. All such adjustments are of a normal recurring nature. Certain information and note disclosures, including a description of significant accounting policies normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP"), have been condensed or omitted pursuant to such rules and regulations. Certain prior amounts have been reclassified or combined to conform to the current year presentation. These interim financial statements should be read in conjunction with the Company’s annual Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, filed with the SEC on March 10, 2021. The results of operations for the three and six months ended June 30, 2021 are not necessarily indicative of the results for any subsequent periods or the entire fiscal year ending December 31, 2021. Use of Estimates and Assumptions The preparation of the Company’s Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions used. Liquidity At this time, we believe that we will be able to continue to meet our liquidity requirements and fund our fixed obligations (such as debt service and operating leases) and other cash needs for our operations for at least the next twelve months from the issuance of the Condensed Consolidated Financial Statements through a combination of available cash, distributions from our subsidiaries, raising of additional debt or equity, refinancing of certain of our subsidiary indebtedness or preferred stock, other financing arrangements and/or the sale of assets and certain investments. Historically, we have chosen to reinvest cash and receivables into the growth of our various businesses, and therefore have not kept a large amount of cash on hand at the holding company level. The ability of HC2’s subsidiaries to make distributions to HC2 is subject to numerous factors, including restrictions contained in each subsidiary’s financing agreements, regulatory requirements, availability of sufficient funds at each subsidiary and the approval of such payment by each subsidiary’s board of directors, which must consider various factors, including general economic and business conditions, tax considerations, strategic plans, financial results and condition, expansion plans, any contractual, legal or regulatory restrictions on the payment of dividends, and such other factors each subsidiary’s board of directors considers relevant. Although the Company believes that it will be able to raise additional equity capital, refinance indebtedness or preferred stock, enter into other financing arrangements or engage in asset sales and sales of certain investments sufficient to fund any cash needs that we are not able to satisfy with the funds on hand or expected to be provided by our subsidiaries, there can be no assurance that it will be able to do so on terms satisfactory to the Company, if at all. Such financing options, if pursued, may also ultimately have the effect of negatively impacting our liquidity profile and prospects over the long-term. Our ability to sell assets and certain of our investments to meet our existing financing needs may also be limited by our existing financing instruments. In addition, the sale of assets or the Company’s investments may also make the Company less attractive to potential investors or future financing partners. COVID-19 There are many uncertainties regarding the current coronavirus ("COVID-19") pandemic, and the Company continues to closely monitor the impact of the COVID-19 pandemic, including the effectiveness of the vaccine programs, on all aspects of its business, including how it will impact its customers, employees, suppliers, vendors, business partners and distribution channels and any potential prolonging or worsening of the pandemic due to COVID-19 variants. We are unable to predict the impact that COVID-19 will have on its financial position and operating results due to numerous uncertainties, however as the pandemic continues, it may have an adverse effect on the Company’s results of operations, financial condition, or liquidity for fiscal year 2021. The Company expects to continue to assess the evolving impact of the COVID-19 pandemic. Statement of Cash Flows The following table provides a reconciliation of cash and cash equivalents and restricted cash to amounts reported within the Condensed Consolidated Balance Sheets and Condensed Consolidated Statements of Cash Flows (in millions): June 30, 2021 2020 Cash and cash equivalents, beginning of period $ 43.8 $ 23.3 Restricted cash included in other assets 1.5 1.4 Total cash and cash equivalents and restricted cash $ 45.3 $ 24.7 Cash and cash equivalents, end of period $ 18.1 $ 23.7 Restricted cash included in other assets 2.6 1.4 Total cash and cash equivalents and restricted cash $ 20.7 $ 25.1 Cash and cash equivalents classified in Assets held for sale, beginning of period $ 195.2 $ 216.0 Restricted cash classified in Assets held for sale 0.2 0.2 Total cash and cash equivalents and restricted cash classified in Assets held for sale $ 195.4 $ 216.2 Cash and cash equivalents classified in Assets held for sale, end of period $ 253.7 $ 180.3 Restricted cash classified in Assets held for sale — 0.2 Total cash and cash equivalents and restricted cash classified in Assets held for sale $ 253.7 $ 180.5 Supplemental cash flow information: Cash paid for interest $ 12.3 $ 33.0 Cash paid for taxes, net of refunds $ 2.6 $ 8.0 Non-cash investing and financing activities: Property, plant and equipment included in accounts payable $ 2.1 $ 4.9 Investments included in accounts receivable $ — $ 20.0 Investments included in accounts payable $ — $ 8.5 Extinguishment of convertible note in exchange $ 51.8 $ — Issuance of convertible note in exchange $ (51.8) $ — Debt assumed in acquisitions $ 6.3 $ — Reclassification Certain previous year amounts have been reclassified to conform with current year presentations, as related to the reporting of new balance sheet line items: • The recast of Beyond6, ICS, and CIG's results to discontinued operations. Further, the reclassification of prior period assets and liabilities have been classified as held for sale. See Note 3. Discontinued Operations for further information; • As a result of the sale of ICS, and in accordance with ASC 280, the Company no longer considers the results of operations and Balance Sheets of the retained ICS entities as a separate segment. Formerly the Telecommunications segment, these entities have been reclassified to the Other segment. See Note 17. Operating Segment and Related Information for further information; • As a result of the sale of Beyond6, and in accordance with ASC 280, the Company no longer considers the results of operations and Balance Sheets of Beyond6 as a separate segment. Formerly the Clean Energy segment, this entity has been reclassified to the Other segment. See Note 17. Operating Segment and Related Information for further information; and • The recast of prior year earnings per share as a result of the discontinued operations noted above. This includes presenting EPS for Net income (loss) from continuing operations, Net income (loss) from discontinuing operations, and Net income (loss). See Note 18. Basic and Diluted Income (Loss) Per Common Share for further details. • Certain 2021 statement of cash flow items have been reclassified to conform to the current financial statement presentation. These reclassifications have no effect on previously reported net income. Accounting Pronouncements Adopted in the Current Year Accounting for Debt with Conversion Options ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470- 20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity , was issued by the FASB in August 2020. This ASU (1) simplifies the accounting for convertible debt instruments and convertible preferred stock by removing the existing guidance in ASC 470-20, Debt: Debt with Conversion and Other Options , that requires entities to account for beneficial conversion features and cash conversion features in equity, separately from the host convertible debt or preferred stock; (2) revises the scope exception from derivative accounting in ASC 815-40 for freestanding financial instruments and embedded features that are both indexed to the issuer’s own stock and classified in stockholders’ equity, by removing certain criteria required for equity classification; and (3) revises the guidance in ASC 260, Earnings Per Share , to require entities to calculate diluted earnings per share (EPS) for convertible instruments by using the if-converted method. In addition, entities must presume share settlement for purposes of calculating diluted EPS when an instrument may be settled in cash or shares. The standard is effective on January 1, 2024, but early adoption was elected as of January 1, 2021. A modified retrospective method of transition was applied, which resulted in no impact to the Company. Accounting Pronouncements to be Adopted Subsequent to December 31, 2021 Credit Loss Standard ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) , Measurement of Credit Losses on Financial Instruments, was issued by FASB in June 2016. This standard is effective January 1, 2020 (with early adoption permitted). This new standard changes the impairment model for most financial assets that are measured at amortized cost and certain other instruments, including trade receivables, from an incurred loss model to an expected loss model and adds certain new required disclosures. Under the expected loss model, entities will recognize estimated credit losses over the entire contractual term of the instrument rather than delaying recognition of credit losses until it is probable the loss has been incurred. The FASB has voted to delay the effective date of ASU 2016-13 to January 1, 2023 for smaller reporting companies with a revised ASU in the fourth quarter of 2019. The Company will not be required to adopt Topic 326 until January 1, 2023. Currently, the Company continues to evaluate the potential impact of the new standard on its financial results. Subsequent Events ASC 855, Subsequent Events requires the Company to evaluate events that occur after the balance sheet date as of which the financial statements are issued, and to determine whether adjustments to or additional disclosures in the financial statements are necessary. See Note 19. Subsequent Events for the summary of the subsequent events.

Discontinued Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	3. Discontinued Operations The results of GMSL, ICS, Beyond6, and CIG and the related expenses directly attributable to the entities were reported as discontinued operations. Summarized operating results of the discontinued operations are as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenue $ — $ 117.5 $ 1.7 $ 331.6 Life, accident and health earned premiums, net 27.3 29.5 55.7 58.2 Net investment income 48.5 48.4 92.4 100.3 Realized/unrealized (losses) gains on investments (4.4) (0.5) 5.1 (19.5) Total revenue 71.4 194.9 154.9 470.6 Cost of revenue — 110.1 0.8 317.5 Policy benefits, changes in reserves, and commissions 69.9 63.0 126.0 135.4 Selling, general and administrative 8.7 11.8 21.1 39.0 Depreciation and amortization (5.1) (3.3) (11.0) (3.3) (Loss) income from operations (2.1) 13.3 18.0 (18.0) Interest expense (0.1) (2.3) (0.5) (8.0) Gain (loss) on sale and liquidation of subsidiaries — — 40.4 (39.3) Income from equity investees — — — 0.5 Other (loss) income — (0.2) (3.1) 1.7 Pre-tax income (loss) from discontinued operations (2.2) 10.8 54.8 (63.1) Income tax benefit (expense) 0.7 (3.3) (4.4) (0.5) (Loss) income from discontinued operations $ (1.5) $ 7.5 $ 50.4 $ (63.6) Sale of CGI On March 29, 2021, the Company announced the entry into a definitive agreement (the "Stock Purchase Agreement") to sell its Insurance segment to Continental General Holdings LLC, an entity controlled by Michael Gorzynski, a director of the Company and, as of June 30, 2021, a beneficial owner of approximately 6.6% of the Company's outstanding common stock who has also served as executive chairman of Continental since October 2020. The transaction value is approximately $90.0 million, inclusive of $65.0 million in cash plus certain assets of CGI. As of the first quarter of 2021, the Insurance segment met the held-for-sale criteria under ASC 205-20 and has been presented in discontinued operations. The sale closed on July 1, 2021, subsequent to quarter end. See Note 19. Subsequent Events for further information. Sale of GMSL The sale of GMSL closed on February 28, 2020. At the time of the sale, the Company recorded a $39.3 million loss on the sale and recognized $31.3 million of Accumulated other comprehensive loss. During the fourth quarter of 2020, the Company recognized a gain on sale of $2.4 million as a result of the cash collateralized bonding facility release. During the first quarter of 2021, the Company recognized a gain of $1.2 million as a result of an indemnity release. The net proceeds from the sale of GMSL were used to repay $15.0 million of the then outstanding balance under the Revolving Credit Agreement and redeem $76.9 million aggregate principal amount of the Company's 11.5% senior secured notes due 2021 (the "2021 Senior Secured Notes"), plus accrued and unpaid interest since December 1, 2019 (the last regularly scheduled interest payment date). As a result of the repayment of $15.0 million Revolving Credit Agreement, the Company allocated the following interest and the amortization of deferred financing costs for the three and six months ended June 30, 2021 and 2020 associated with the principal prepayment from continuing operations to discontinued operations on the Company’s Condensed Consolidated Statement of Operations: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest expense $ — $ — $ — $ 0.2 Amortization of deferred financing costs and original issuance discount $ — $ — $ — $ 0.1 As a result of the mandatory redemption of $76.9 million of 2021 Senior Secured Notes, the Company allocated the following pro-rata interest and amortization of deferred financing costs and original issuance discount for the three and six months ended June 30, 2021 and 2020, from continuing operations to discontinued operations on the Company’s Condensed Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest expense $ — $ — $ — $ 2.2 Amortization of deferred financing costs and original issuance discount $ — $ — $ — $ 0.2 Sale of ICS The sale of ICS and its subsidiary, Go2 Tel, Inc., closed on October 31, 2020. The Company recorded a $0.9 million gain on the sale and recognized $8.2 million of accumulated other comprehensive loss related to the realization of foreign currency translation of PTGi International Carrier Services Ltd., which was essentially liquidated in conjunction with the sale. The proceeds were used for general corporate purposes. Sale of Beyond6 On December 31, 2020, the Company announced a plan to sell Beyond6 to an affiliate of Mercuria Investments US, Inc., pursuant to an Agreement and Plan of Merger (the "Merger Agreement") among Beyond6, Greenfill, Inc., a Delaware corporation ("Parent"), Greenfill Merger Inc., a newly-formed Delaware corporation and wholly-owned subsidiary of Parent, and an affiliate of HC2 as the Stockholder Representative for the Beyond6 stockholders. The sale closed on January 15, 2021. The Company recognized a $39.2 million gain on the sale. A portion of the proceeds from the sale of Beyond6 were used to repay $15.0 million of the then outstanding balance under the Revolving Credit Agreement and repay $27.9 million of the Company's 2021 Senior Secured Notes. As a result of the repayment of $15.0 million Revolving Credit Agreement, the Company allocated the following interest for the three and six months ended June 30, 2021 and 2020 associated with the principal prepayment from continuing operations to discontinued operations on the Company’s Condensed Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest expense $ — $ 0.2 $ 0.1 $ 0.2 As a result of the repayment of $27.9 million of the 2021 Senior Secured Notes, the Company allocated the following pro-rata interest and amortization of deferred financing costs and original issuance discount for the three and six months ended June 30, 2021 and 2020, from continuing operations to discontinued operations on the Company’s Condensed Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest expense $ — $ 0.8 $ 0.3 $ 1.6 Amortization of deferred financing costs and original issuance discount $ — $ 0.1 $ — $ 0.2 Summarized assets and liabilities of the discontinued operations are as follows (in millions): June 30, December 31, Assets Current assets Cash and cash equivalents $ 253.7 $ 195.2 Accounts receivable, net — 13.6 Other current assets 6.7 8.7 Total current assets 260.4 217.5 Investments 4,483.7 4,610.2 Recoverable from reinsurers 1,015.2 957.5 Deferred tax asset — 1.4 Property, plant and equipment, net 1.4 90.5 Goodwill — 2.1 Intangibles, net 2.5 11.7 Other assets 44.0 51.2 Total assets held for sale $ 5,807.2 $ 5,942.1 Liabilities Current liabilities Accounts payable $ — $ 2.6 Accrued liabilities 8.8 35.8 Current portion of debt obligations — 5.7 Other current liabilities 3.6 7.4 Total current liabilities 12.4 51.5 Life, accident and health reserves 4,711.7 4,627.5 Annuity reserves 225.8 228.8 Value of business acquired 188.3 199.8 Deferred tax liability 114.8 136.5 Debt obligations — 50.6 Other liabilities 8.6 12.0 Total liabilities held for sale $ 5,261.6 $ 5,306.7 In addition, as of June 30, 2021, the Company had $5.2 million of assets from its Spectrum segment classified as Assets held for sale in continuing operations related to certain station licenses and assets.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	4. Revenue Revenue from contracts with customers consist of the following (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenue Infrastructure $ 232.0 $ 172.3 $ 393.3 $ 348.8 Spectrum 10.6 9.5 21.1 19.6 Life Sciences 1.2 — 1.2 — Total revenue $ 243.8 $ 181.8 $ 415.6 $ 368.4 Accounts receivables, net from contracts with customers consist of the following (in millions): June 30, December 31, Accounts receivables with customers Infrastructure $ 343.7 $ 168.5 Spectrum 8.5 7.3 Life Sciences 0.1 — Total accounts receivables with customers $ 352.3 $ 175.8 Infrastructure Segment The following table disaggregates DBMG's revenue by market (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Commercial $ 84.8 $ 54.0 $ 134.3 $ 116.8 Industrial 79.0 59.6 119.2 118.4 Transportation 10.8 23.5 24.7 39.9 Government 17.2 11.1 38.5 19.7 Leisure 4.7 11.3 12.2 27.3 Healthcare 11.1 4.7 20.0 12.6 Convention 18.8 1.4 28.2 3.8 Other 5.6 6.1 16.2 9.7 Total revenue from contracts with customers 232.0 171.7 393.3 348.2 Other revenue — 0.6 — 0.6 Total Infrastructure segment revenue $ 232.0 $ 172.3 $ 393.3 $ 348.8 Contract assets and contract liabilities consisted of the following (in millions): June 30, December 31, Costs and recognized earnings in excess of billings on uncompleted contracts $ 63.7 $ 55.6 Billings in excess of costs and recognized earnings on uncompleted contracts $ (146.8) $ (52.2) The change in contract assets is a result of the recording of $35.6 million of costs in excess of billings on uncompleted contracts driven by new commercial projects and $1.9 million of costs in excess of billings on uncompleted contracts for projects acquired in the Banker Steel acquisition, offset by $29.4 million of costs in excess of billings on uncompleted contracts transferred to receivables from contract assets recognized at the beginning of the period. The change in contract liabilities is a result of periodic billing in excess of costs on uncompleted contracts of $114.4 million driven largely by new commercial projects and $55.0 million of billings in excess of costs on uncompleted contracts for projects acquired as a result of the Banker Steel acquisition, offset by revenue recognized that was included in the contract liability balance at the beginning of the period in the amount of $74.8 million. The transaction price allocated to remaining unsatisfied performance obligations consisted of the following (in millions): Within one year Within five years Total Commercial $ 580.5 $ 620.2 $ 1,200.7 Industrial 201.3 — 201.3 Transportation 41.5 17.2 58.7 Government 47.3 — 47.3 Leisure 7.0 — 7.0 Healthcare 51.1 — 51.1 Convention 52.7 — 52.7 Other 5.6 — 5.6 Remaining unsatisfied performance obligations $ 987.0 $ 637.4 $ 1,624.4 DBMG includes an additional $10.0 million in its backlog that is not included in the remaining unsatisfied performance obligations noted above. This backlog represents commitments under master service agreements that are estimated amounts of work to be performed based on customer communications, historic experience and knowledge of our customers' intentions. Life Sciences Segment The following table disaggregates the Life Sciences segment's revenue by type (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Systems revenue $ 1.2 $ — $ 1.2 $ — Total Life Sciences segment revenue $ 1.2 $ — $ 1.2 $ — Spectrum Segment The following table disaggregates the Spectrum segment's revenue by type (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Network advertising $ 4.8 $ 4.0 $ 9.5 $ 9.0 Broadcast station 4.5 3.8 8.9 7.3 Network distribution 0.7 1.0 1.6 2.1 Other 0.6 0.7 1.1 1.2 Total Spectrum segment revenue $ 10.6 $ 9.5 $ 21.1 $ 19.6 The transaction price allocated to remaining unsatisfied performance obligations consisted of $1.7 million, $6.9 million, and $0.1 million of network advertising, broadcasting station revenues, and other revenues, respectively, of which $5.6 million is expected to be recognized within one year and $3.1 million is expected to be recognized within five years.

Acquisitions, Depositions, and

Acquisitions, Depositions, and Deconsolidations	6 Months Ended
	Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions, Dispositions, and Deconsolidations	5. Acquisitions, Dispositions, and Deconsolidations Infrastructure Segment Banker Steel Acquisition On March 15, 2021, the Company announced that DBMG entered into an agreement to acquire 100% of Banker Steel Holdco LLC ("Banker Steel") for $145.0 million, which closed on May 27, 2021. The acquisition was financed with $64.1 million from a partial draw on a new $110.0 million revolving credit facility, $49.6 million of sellers' notes, $6.3 million of assumed debt of Banker Steel, and $25.0 million in cash received from HC2 in the settlement of certain intercompany balances. Banker Steel provides fabricated structural steel and erection services primarily for the East Coast and Southeast commercial and industrial construction market. Banker Steel consists of six operating companies: Banker Steel Co., LLC; NYC Constructors, LLC; Memco LLC; Derr & Isbell Construction LLC; Innovative detailing and Engineering Solutions; and Lynchburg Freight and Specialty LLC. The transaction was accounted for as business acquisition. The preliminary allocation of the fair value of consideration transferred among the identified assets acquired, liabilities assumed, intangibles and residual goodwill are summarized as follows (in millions): Purchase Consideration at Fair Value Partial draw on new $110.0 million revolving credit facility $ 64.1 Sellers' notes 49.6 Bankers Steel debt - assumed 6.3 Cash 25.0 Gross consideration 145.0 Less: Transaction costs 0.4 Less: Bankers debt - assumed 6.3 Less: R&W premium paid by seller 0.5 Net consideration $ 137.8 Cash and cash equivalents $ 9.3 Accounts receivable, net 111.3 Costs recognized in earnings in excess of billings on uncompleted contracts 1.9 Assets held for sale 0.7 Other current assets 7.3 Property, plant, and equipment, net 62.6 Other assets 40.2 Intangibles, net 58.5 Goodwill 10.3 Total assets to be acquired 302.1 Accounts Payable 39.1 Billings in excess of costs and recognized earnings on uncompleted contracts 55.0 Other current liabilities 29.6 Other liabilities 34.2 Long-term debt, less current portion 6.4 Total liabilities to be assumed 164.3 Total net assets acquired $ 137.8 The size and breadth of the Banker Steel acquisition necessitates use of the allowable measurement period to adequately analyze all the factors used in establishing the asset and liability fair values as of the acquisition date. The preliminary acquisition accounting is based upon the Company’s estimates of fair value. The primary areas of the preliminary acquisition accounting that are not yet finalized include the following: (i) finalizing the review and valuation of property and equipment (including the models, key assumptions, estimates and inputs used), (ii) finalizing the review and valuation of related intangible assets (including key assumptions, inputs and estimates), (iii) finalizing the valuation of certain in-place contracts or contractual relationships (including but not limited to leases), (iv) finalizing our review of certain assets acquired and liabilities assumed, (v) finalizing our estimate of the impact of acquisition accounting on deferred income taxes or liabilities. As the initial acquisition accounting is based on our preliminary assessments, actual values may differ (possibly materially) when final information becomes available that differs from our current estimates. We will continue to evaluate these items, until they are satisfactorily resolved and adjust our acquisition accounting accordingly, within the allowable measurement period (not to exceed one year from the date of acquisition), as defined by ASC 805. Goodwill was determined based on the residual differences between fair value of consideration transferred and the value assigned to acquired assets and liabilities. Among the factors that contributed to goodwill was approximately $58.5 million assigned to intangibles, including customer relationships of $34.0 million with a useful life of 18 years, trade names of $7.4 million with a useful life of 15 years, existing customer contracts of $15.1 million with a useful life of 2 years and leasehold interests of $2.0 million with varying useful life. Goodwill is not amortized and is not deductible for tax purposes. Acquisition costs incurred by DBMG in connection with the acquisition of Banker Steel were approximately $1.5 million, which were included in selling, general and administrative expenses. The acquisition costs were primarily related to legal, accounting and valuation services. The following schedule presents the unaudited results of operations data for the three and six months ended June 30, 2021 for Banker Steel since the date of acquisition (in millions): Three Months Ended June 30, 2021 Six Months Ended June 30, 2021 Revenue $ 39.5 $ 39.5 Net income from operations $ 1.3 $ 1.3 Net income attributable to HC2 Holdings $ 0.6 $ 0.6 Pro Forma Adjusted Summary The following schedule presents unaudited consolidated pro forma results of operations data as if the acquisition of Banker Steel had occurred on January 1, 2020. This information does not purport to be indicative of the actual results that would have occurred if the acquisitions had actually been completed on the date indicated, nor is it necessarily indicative of the future operating results or the financial position of the combined company (in millions): Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Revenue $ 326.1 $ 252.5 $ 613.1 $ 517.0 Income (loss) from operations $ 1.5 $ (7.3) $ (7.1) $ (16.7) Net income (loss) attributable to HC2 Holdings $ (15.7) $ 10.5 $ (2.6) $ (70.3) Spectrum Segment During the six months ended June 30, 2021, the Company increased its controlling interest in DTV from 60%, inclusive of approximately 10% proxy and voting rights from minority holders, to approximately 76%, inclusive of 15% proxy and voting rights from minority holders, from private purchases and proxy voting rights. Insurance Segment Sale of CGI On March 29, 2021, the Company announced the entry into the Stock Purchase Agreement to sell its Insurance segment to Continental General Holdings LLC, an entity controlled by Michael Gorzynski, a director of the Company and, as of June 30, 2021, a beneficial owner of approximately 6.6% of the Company's outstanding common stock who has also served as executive chairman of Continental since October 2020. The transaction value is approximately $90.0 million, inclusive of $65.0 million in cash plus certain assets of CGI. The sale closed on July 1, 2021, subsequent to quarter end. See Note 19. Subsequent Events for further information. Other Segment Sale of GMSL On January 30, 2020, the Company announced that, through its indirect subsidiary GMH in which the Company holds an approximately 73% controlling interest, the Company entered into a definitive agreement to sell 100% of the shares of GMSL to Trafalgar AcquisitionCo, Ltd. and an affiliate of J.F. Lehman & Company, LLC. The total base consideration was $250.0 million, subject to customary purchase price adjustments, working capital adjustments, and a potential earn-out of up to $12.5 million at such time, if any, if J.F. Lehman & Company, LLC and its investment affiliates achieve a specified multiple of their invested capital. The purchase price is subject to customary potential downward or upward post-closing adjustments based on net working capital, cash, unpaid transaction expenses, indebtedness and certain of the Company’s pre-closing paid capital expenditures. The Share Purchase Agreement contained customary representations, warranties and covenants for a transaction of this nature. The transaction closed on February 28, 2020. GMH received approximately $144.0 million of net proceeds from the sale, of which $36.8 million and $5.5 million were paid to noncontrolling interest holders and redeemable noncontrolling interest holders, respectively. HC2 received net proceeds of approximately $100.8 million. In connection with the closing of the transaction, the purchaser deposited (i) $1.25 million of the base price into an escrow fund for the purpose of securing certain indemnification obligations for losses payable in the first twelve months after closing and (ii) $1.91 million of the base price into an escrow fund for the purpose of securing a purchase price adjustment, if any, in favor of purchaser. Following the closing, the purchaser paid an amount equal to $2.4 million on the earlier of December 31, 2020 and the date on which a cash collateralized bonding facility was released. In the first quarter of 2020, the Company recorded a $39.3 million loss on the sale and recognized a $31.3 million of Accumulated other comprehensive loss. During the fourth quarter of 2020, the Company recognized a gain on sale of $2.4 million as a result of the cash collateralized bonding facility release. During the first quarter of 2021, the Company recognized a gain of $1.2 million as a result of indemnity release. Sale of HMN On October 30, 2019, the Company announced the sale of its stake in HMN, its 49% joint venture with Huawei Technologies Co., Ltd., to Hengtong Optic-Electric Co Ltd. The sale valued HMN at $285 million, and GMH's 49% stake, through New Saxon, at approximately $140 million. Under the terms of the Sale and Purchase Agreement, the sale of New Saxon’s 49% interest in HMN will be affected in two tranches. The sale of the portion of New Saxon’s 30% interest of HMN, closed on May 12, 2020 (the "First HMN Close"). The remaining 19% interest of HMN is retained by New Saxon and subject to a put option agreement by New Saxon, exercisable starting on the second year anniversary of the closing date of the First HMN Close at a price equal to the greater of the share price paid for the 30% interest or fair market value as of the exercisable date. For the three months ended June 30, 2020, in conjunction with the first tranche of the sale, the Company received $85.5 million in cash, of which $17.5 million and $2.1 million were paid to noncontrolling interest holders and redeemable noncontrolling interest holders, respectively. On the close date, New Saxon recorded a $71.1 million gain, included in Other income (loss) in the Condensed Consolidated Statements of Operations. The gain recognized includes $11.3 million related to the fair value of the put option. In addition, on the close date, the Company recorded a $7.2 million tax expense related to a foreign tax payment when the first tranche closed. Sale of ICS The sale of ICS and its subsidiary, Go2 Tel, Inc., closed on October 31, 2020. The Company recorded a $0.9 million gain on the sale and recognized $8.2 million of Accumulated other comprehensive loss related to the realization of foreign currency translation of PTGi International Carrier Services Ltd., which was essentially liquidated in conjunction with the sale. The proceeds were used for general corporate purposes. Sale of Beyond6 On December 31, 2020, the Company announced a plan to sell Beyond6 to an affiliate of Mercuria Investments US, Inc., pursuant to an Agreement and Plan of Merger (the "Merger Agreement") among Beyond6, Greenfill, Inc., a Delaware Corporation ("Parent"), Greenfill Merger Inc., a newly-formed Delaware corporation and wholly-owned subsidiary of the Parent, and an affiliate of HC2 as the Stockholder Representative for the Beyond6 stockholders, for a total purchase price, net of Beyond6's debt and transaction expenses, customary purchase price adjustments and escrow arrangements, of approximately $106.5 million. Net proceeds received by HC2 at closing was cash consideration of approximately $70.0 million. The sale closed on January 15, 2021. The Company recognized a $39.2 million gain on the sale. See Note 3. Discontinued Operations for further details.

Accounts Receivable, net

Accounts Receivable, net	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Accounts Receivable, net	6. Accounts Receivable, net Accounts receivable, net consist of the following (in millions): June 30, December 31, Contracts in progress $ 250.5 $ 118.6 Unbilled retentions 93.8 50.3 Trade receivables 8.6 7.5 Other receivables 12.2 8.9 Allowance for doubtful accounts (0.5) (0.6) Total $ 364.6 $ 184.7

Property, Plant, and Equipment,

Property, Plant, and Equipment, net	6 Months Ended
	Jun. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment, net	7. Property, Plant and Equipment, net Property, plant and equipment, net consists of the following (in millions): June 30, December 31, Equipment, furniture and fixtures, and software $ 170.4 $ 113.7 Building and leasehold improvements 43.4 41.0 Land 24.1 24.1 Plant and transportation equipment 10.6 4.4 Construction in progress 7.6 3.1 256.1 186.3 Less: Accumulated depreciation 82.8 73.5 Total $ 173.3 $ 112.8 Depreciation expense was $5.3 million and $5.2 million for the three months ended June 30, 2021 and 2020, respectively. These amounts included $2.8 million and $2.3 million of depreciation expense recognized within cost of revenue for each of the three months ended June 30, 2021 and 2020. Depreciation expense was $10.0 million and $10.3 million for the six months ended June 30, 2021 and 2020, respectively. These amounts included $5.0 million and $4.6 million of depreciation expense recognized within cost of revenue for each of the six months ended June 30, 2021 and 2020.

Goodwill and Intangibles, net

Goodwill and Intangibles, net	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles, net	8. Goodwill and Intangibles, net Goodwill The carrying amount of goodwill by segment was as follows (in millions): Infrastructure Spectrum Total Balance at December 31, 2020 $ 89.6 $ 21.4 $ 111.0 Acquisitions 10.3 — 10.3 Translation (0.2) — (0.2) Balance at June 30, 2021 $ 99.7 $ 21.4 $ 121.1 Indefinite-lived Intangible Assets The carrying amount of indefinite-lived intangible assets was as follows (in millions): June 30, 2021 December 31, 2020 FCC licenses $ 107.5 $ 113.0 Other — — Total $ 107.5 $ 113.0 For the six months ended June 30, 2021, FCC licenses decreased $5.5 million predominately related to the reclassification to held-for-sale as a result of our Spectrum segment entering into certain agreements to sell non-core FCC licenses. Definite Lived Intangible Assets The gross carrying amount and accumulated amortization of amortizable intangible assets by major intangible asset class were as follows (in millions): Weighted-Average Original Useful Life June 30, 2021 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Trade names 14 years $ 25.4 $ (5.4) $ 20.0 $ 18.0 $ (4.6) $ 13.4 Customer relationships and contracts 11 years 85.4 (14.5) 70.9 36.4 (12.1) 24.3 Channel sharing arrangements 35 years 20.1 (1.9) 18.2 20.2 (1.6) 18.6 Other 8 years 8.4 (3.0) 5.4 5.5 (2.7) 2.8 Total $ 139.3 $ (24.8) $ 114.5 $ 80.1 $ (21.0) $ 59.1 Amortization expense for definite lived intangible assets was $2.3 million and $1.5 million for the three months ended June 30, 2021 and 2020, respectively, and was included in Depreciation and amortization in our Condensed Consolidated Statements of Operations. Amortization expense for definite lived intangible assets was $3.8 million and $3.0 million for the six months ended June 30, 2021 and 2020, respectively, and was included in Depreciation and amortization in our Condensed Consolidated Statements of Operations. Amortization Excluding the impact of any future acquisitions, dispositions or change in foreign currency, the Company estimates the annual amortization expense of amortizable intangible assets for the next five fiscal years will be as follows (in millions): Estimated Amortization 2021 $ 7.8 2022 15.6 2023 11.1 2024 8.0 2025 7.3 Thereafter 64.7 Total $ 114.5

Debt Obligations

Debt Obligations	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt Obligations	9. Debt Obligations Debt obligations consist of the following (in millions): June 30, December 31, Infrastructure LIBOR plus 5.85% Note, due 2023 $ — $ 71.6 LIBOR plus 1.50% Line of Credit — 38.7 LIBOR plus 3.25% Note, due 2026 109.6 — LIBOR plus 2.15% Line of Credit 71.1 — 4.00% Note due 2024 27.5 — 8.00% Note due 2024 19.6 — Other, various maturity dates 6.5 — Obligations under finance leases 0.1 0.2 Spectrum 8.50% Note due 2021 19.3 19.3 10.50% Note due 2021 32.9 32.9 Other, various maturity dates 2.9 2.9 Obligations under finance leases 0.1 0.6 Non-Operating Corporate 11.50% Senior Secured Notes, due 2021 — 340.4 8.50% Senior Secured Notes, due 2026 330.0 — 7.50% Convertible Senior Notes, due 2022 3.2 55.0 7.50% Convertible Senior Notes, due 2026 51.8 — LIBOR plus 5.75% Line of Credit 5.0 15.0 679.6 576.6 Unamortized issuance discount, issuance premium, and deferred financing costs (3.1) (15.1) Less: current portion of debt obligations (70.2) (433.6) Debt obligations $ 606.3 $ 127.9 Aggregate finance lease and debt payments, including interest are as follows (in millions): Finance Leases Debt Total 2021 $ 0.2 $ 71.5 $ 71.7 2022 — 57.6 57.6 2023 — 57.1 57.1 2024 — 142.2 142.2 2025 — 40.2 40.2 Thereafter — 507.5 507.5 Total minimum principal and interest payments 0.2 876.1 876.3 Less: Amount representing interest — (196.7) (196.7) Total aggregate finance lease and debt payments $ 0.2 $ 679.4 $ 679.6 The interest rates on the finance leases range from approximately 2.0% to 10.0%. Infrastructure In May 2021, DBMG repaid its revolving line of credit under the Credit and Security Agreement with Wells Fargo Bank ("Revolving Line") and its term loan under a financing agreement with TWC Asset Management Company LLC ("TWC Loan"). In addition, DBMG entered into a new credit facility with UMB Bank ("UMB"). Under the terms of the agreement, UMB agreed to a $110.0 million term loan ("UMB Term Loan") and $110.0 million revolving credit agreement ("UMB Revolving Line"). The UMB Term loan expires in 2026 and will bear interest at a rate of 3.25%. The UMB Revolving Line expires in 2024 and will bear interest at a rate of Prime Rate minus 1.10%. The proceeds were used to fully repay DBMG's existing debt obligations, fund a portion of the Banker Steel acquisition, and provide additional working capital capacity to DBMG. The extinguishment of the Revolving Line and the TWC Loan yielded a loss on extinguishment of $1.6 million included in Loss on early extinguishment or restructuring of debt in the Condensed Consolidated Statement of Operations. Non-Operating Corporate On February 1, 2021, HC2 repaid its 2021 Senior Secured Notes and issued $330.0 million aggregate principal amount of 8.5% senior secured notes due 2026 (the "2026 Senior Secured Notes"). In addition, the Company entered into exchange agreements with certain holders of approximately $51.8 million aggregate principal amount of its existing $55.0 million 7.5% convertible senior notes due 2022 (the "2022 Convertible Notes"), pursuant to which the Company exchanged such holders' 2022 Convertible Notes for newly issued 7.5% convertible notes due 2026 (the "2026 Convertible Notes"). The 2026 Senior Secured Notes were issued in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended. The Company accounted for the transactions under the debt extinguishment model as the present value of cash flows under the terms of the 2026 Senior Secured Notes and 2026 Convertible Notes was at least 10% different from the present value of the remaining cash flows under the 2021 Senior Secured Notes and the 2022 Convertible Notes. The extinguishment of the 2021 Senior Secured Notes yielded a loss on extinguishment of $4.5 million. The extinguishment of the $51.8 million of 2022 Convertible Notes yielded a loss on extinguishment of $5.4 million, an acceleration of the amortization of discount of $5.3 million, and extinguishment of the bifurcated conversion option classified as equity of $7.7 million. Senior Secured Notes The 2026 Senior Secured Notes were issued under an indenture dated February 1, 2021, by and among the Company, the guarantors party thereto and U.S. Bank National Association, a national banking association ("U.S. Bank"), as trustee (the "Secured Indenture"). The 2026 Senior Secured Notes were issued at 100% of par. Convertible Notes The 2026 Convertible Notes were issued under a separate indenture dated February 1, 2021, between the Company and U.S. Bank, as trustee (the "Convertible Indenture"). The 2026 Convertible Notes were issued at 100% of par. Each $1,000 of principal of the 2026 Convertible Notes will initially be convertible into 234.2971 shares of our common stock, which is equivalent to an initial conversion price of approximately $4.27 per share, subject to adjustment upon the occurrence of specified events. The fair value of the embedded conversion feature contained in the 2026 Convertible Notes had a fair value of $12.3 million, which was recorded as a premium on the 2026 Convertible Notes. The 2026 Convertible Notes have an effective interest rate of 3.21%, which reflects the $12.3 million premium and $1.1 million of deferred financing fees. At June 30, 2021, the 2026 Convertible Notes had a carrying value of $62.2 million and an unamortized premium of $11.4 million. Based on the closing price of our common stock of $3.98 on June 30, 2021, the if-converted value of the 2026 Convertible Notes did not exceed its principal value. For the six months ended June 30, 2021, interest cost recognized for the period relating to both the contractual interest coupon and amortization of discount net of premium was $1.6 million and $0.8 million, respectively. Line of Credit On February 23, 2021, the Company entered into a third amendment (the "Amendment") of the 6.75% line of credit with MSD PCOF Partners IX, LLC ("Revolving Credit Agreement"). Among other things, the Amendment (i) increases the aggregate principal amount of the Revolving Credit Agreement to $20.0 million, (ii) extends the maturity date of the Revolving Credit Amendment to February 23, 2024, (iii) updates the affirmative and negative covenants contained in the Amended Credit Agreement so that they are substantially consistent with the affirmative and negative covenants contained in the indenture that governs the 2026 Senior Secured Notes and (iv) reduces the interest rate margin applicable to loans borrowed under the Amended Credit Agreement to 5.75% from the 6.75% described above. Except as modified by the Amendment, the terms of the Revolving Credit Agreement remain in effect. In May 2021, HC2 drew $5.0 million of the Revolving Credit Agreement. The Company used the proceeds to fund the redemption of the Company's Series A and A-2 Preferred Stock. HC2 is in compliance with its debt covenants as of June 30, 2021.

Supplementary Financial Informa

Supplementary Financial Information	6 Months Ended
	Jun. 30, 2021
Offsetting [Abstract]
Supplementary Financial Information	10. Supplementary Financial Information Contracts in Progress Costs and recognized earnings in excess of billings on uncompleted contracts and billings in excess of costs and recognized earnings on uncompleted contracts consist of the following: June 30, December 31, Costs incurred on contracts in progress $ 1,611.6 $ 752.9 Estimated earnings 254.0 139.0 1,865.6 891.9 Less progress billings 1,948.7 888.5 $ (83.1) $ 3.4 The above is included in the accompanying condensed consolidated balance sheet under the following line items: Costs and recognized earnings in excess of billings on uncompleted contracts $ 63.7 $ 55.6 Billings in excess of costs and recognized earnings on uncompleted contracts (146.8) (52.2) $ (83.1) $ 3.4 Investments Carrying values of other invested assets were as follows (in millions): June 30, 2021 December 31, 2020 Measurement Equity Total Measurement Equity Total Common stock $ — $ 2.5 $ 2.5 $ — $ 2.5 $ 2.5 Preferred stock — 12.1 12.1 — 15.4 15.4 Fixed maturities 0.5 — 0.5 0.5 — 0.5 Other 11.3 26.7 38.0 11.3 25.7 37.0 Total $ 11.8 $ 41.3 $ 53.1 $ 11.8 $ 43.6 $ 55.4 Fair Value of Financial Instruments Not Measured at Fair Value The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis. The table excludes carrying amounts for cash and cash equivalents, accounts receivable, accounts payable and other current liabilities, and other assets and liabilities that approximate fair value due to relatively short periods to maturity (in millions): June 30, 2021 Fair Value Measurement Using: Carrying Value Estimated Fair Value Level 1 Level 2 Level 3 Assets Other invested assets $ 11.3 $ 11.3 $ — $ — $ 11.3 Total assets not accounted for at fair value $ 11.3 $ 11.3 $ — $ — $ 11.3 Liabilities Debt obligations (1) $ 676.3 $ 692.7 $ — $ 692.7 $ — Total liabilities not accounted for at fair value $ 676.3 $ 692.7 $ — $ 692.7 $ — December 31, 2020 Fair Value Measurement Using: Carrying Value Estimated Fair Value Level 1 Level 2 Level 3 Assets Other invested assets $ 11.3 $ 11.3 $ — $ — $ 11.3 Total assets not accounted for at fair value $ 11.3 $ 11.3 $ — $ — $ 11.3 Liabilities Debt obligations (1) $ 560.7 $ 579.2 $ — $ 579.2 $ — Total liabilities not accounted for at fair value $ 560.7 $ 579.2 $ — $ 579.2 $ — (1) Excludes certain lease obligations accounted for under ASC 842, Leases . Debt Obligations. The fair value of the Company’s long-term obligations was determined using Bloomberg Valuation Service BVAL. The methodology combines direct market observations from contributed sources with quantitative pricing models to generate evaluated prices and classified as Level 2. Other Non-Current Assets The following tables provide information relating to Other non-current assets (in millions): June 30, December 31, Right of use asset $ 72.2 $ 39.8 Other 4.5 2.4 Total other non-current assets $ 76.7 $ 42.2 Accrued Liabilities Accrued liabilities consist of the following (in millions): June 30, December 31, Accrued expenses and other current liabilities $ 42.2 $ 27.9 Accrued payroll and employee benefits 32.6 34.7 Accrued interest 26.7 13.9 Accrued income taxes 0.4 0.6 Total accrued liabilities $ 101.9 $ 77.1 Other Non-Current Liabilities The following tables provide information relating to Other non-current liabilities (in millions): June 30, December 31, Lease liability, net of current portion $ 60.4 $ 31.6 Other 10.2 8.2 Total other non-current liabilities $ 70.6 $ 39.8

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	11. Leases Operating lease right-of-use-assets and finance leases are recognized in the Condensed Consolidated Balance Sheets within Other assets and Property, plant and equipment, net, respectively. Operating lease liability and finance lease liability are recognized in the Condensed Consolidated Balance Sheets within Other liabilities and Debt obligations, respectively. As of June 30, 2021 and December 31, 2020, lease right-of-use assets and lease liabilities consist of the following (in millions): June 30, December 31, Right-of-use assets: Operating lease (Other non-current assets) $ 72.2 $ 39.8 Finance lease (Property, plant and equipment, net) 0.3 0.9 Total right-of-use assets $ 72.5 $ 40.7 Lease liabilities: Current portion of operating lease (Other current liabilities) $ 16.2 $ 11.2 Non-current portion of operating lease (Other non-current liabilities) 60.4 31.6 Finance lease (Debt obligations) 0.2 0.8 Total lease liabilities $ 76.8 $ 43.6 The tables below present financial information associated with the Company's leases. This information is presented as of, and for the three and six months ended June 30, 2021 and 2020. The Company has entered into operating and finance lease agreements primarily for land, office space, equipment and vehicles, expiring between 2021 and 2045. The following table summarizes the components of lease expense for the three and six months ended June 30, 2021 and 2020 (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Finance lease cost: Amortization of right-of-use assets $ 0.3 $ 0.3 $ 0.6 $ 0.6 Interest on lease liabilities — — — 0.1 Net finance lease cost 0.3 0.3 0.6 0.7 Operating lease cost 4.3 3.5 7.8 7.2 Variable lease cost 0.1 0.1 0.2 0.2 Total lease cost $ 4.7 $ 3.9 $ 8.6 $ 8.1 Cash flow information related to leases for the three and six months ended June 30, 2021and 2020 is as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ — $ 0.1 $ — $ 0.1 Financing cash flows from finance leases $ 0.2 $ 0.3 $ 0.5 $ 0.5 Operating cash flows from operating leases $ 4.2 $ 3.6 $ 7.9 $ 7.1 Right-of-use assets obtained in exchange for new lease liabilities Finance leases $ — $ 0.1 $ — $ 0.1 Operating leases $ 37.3 $ 3.6 $ 41.2 $ 12.1 As of June 30, 2021 and December 31, 2020, the weighted-average remaining lease term and the weighted-average discount rate for finance leases and operating leases are as follows: June 30, December 31, Weighted-average remaining lease term (years) - operating lease 8.0 4.4 Weighted-average remaining lease term (years) - finance lease 1.0 0.9 Weighted-average discount rate - operating lease 5.2 % 6.2 % Weighted-average discount rate - finance lease 7.0 % 8.9 % As of June 30, 2021, undiscounted cash flows for finance and operating leases are as follows (in millions): Operating Finance 2021 $ 19.6 $ 0.2 2022 16.6 — 2023 12.4 — 2024 8.9 — 2025 6.4 — Thereafter 29.8 — Total future lease payments 93.7 0.2 Less: Present values (17.1) — Total lease liability balance $ 76.6 $ 0.2
Leases	11. Leases Operating lease right-of-use-assets and finance leases are recognized in the Condensed Consolidated Balance Sheets within Other assets and Property, plant and equipment, net, respectively. Operating lease liability and finance lease liability are recognized in the Condensed Consolidated Balance Sheets within Other liabilities and Debt obligations, respectively. As of June 30, 2021 and December 31, 2020, lease right-of-use assets and lease liabilities consist of the following (in millions): June 30, December 31, Right-of-use assets: Operating lease (Other non-current assets) $ 72.2 $ 39.8 Finance lease (Property, plant and equipment, net) 0.3 0.9 Total right-of-use assets $ 72.5 $ 40.7 Lease liabilities: Current portion of operating lease (Other current liabilities) $ 16.2 $ 11.2 Non-current portion of operating lease (Other non-current liabilities) 60.4 31.6 Finance lease (Debt obligations) 0.2 0.8 Total lease liabilities $ 76.8 $ 43.6 The tables below present financial information associated with the Company's leases. This information is presented as of, and for the three and six months ended June 30, 2021 and 2020. The Company has entered into operating and finance lease agreements primarily for land, office space, equipment and vehicles, expiring between 2021 and 2045. The following table summarizes the components of lease expense for the three and six months ended June 30, 2021 and 2020 (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Finance lease cost: Amortization of right-of-use assets $ 0.3 $ 0.3 $ 0.6 $ 0.6 Interest on lease liabilities — — — 0.1 Net finance lease cost 0.3 0.3 0.6 0.7 Operating lease cost 4.3 3.5 7.8 7.2 Variable lease cost 0.1 0.1 0.2 0.2 Total lease cost $ 4.7 $ 3.9 $ 8.6 $ 8.1 Cash flow information related to leases for the three and six months ended June 30, 2021and 2020 is as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ — $ 0.1 $ — $ 0.1 Financing cash flows from finance leases $ 0.2 $ 0.3 $ 0.5 $ 0.5 Operating cash flows from operating leases $ 4.2 $ 3.6 $ 7.9 $ 7.1 Right-of-use assets obtained in exchange for new lease liabilities Finance leases $ — $ 0.1 $ — $ 0.1 Operating leases $ 37.3 $ 3.6 $ 41.2 $ 12.1 As of June 30, 2021 and December 31, 2020, the weighted-average remaining lease term and the weighted-average discount rate for finance leases and operating leases are as follows: June 30, December 31, Weighted-average remaining lease term (years) - operating lease 8.0 4.4 Weighted-average remaining lease term (years) - finance lease 1.0 0.9 Weighted-average discount rate - operating lease 5.2 % 6.2 % Weighted-average discount rate - finance lease 7.0 % 8.9 % As of June 30, 2021, undiscounted cash flows for finance and operating leases are as follows (in millions): Operating Finance 2021 $ 19.6 $ 0.2 2022 16.6 — 2023 12.4 — 2024 8.9 — 2025 6.4 — Thereafter 29.8 — Total future lease payments 93.7 0.2 Less: Present values (17.1) — Total lease liability balance $ 76.6 $ 0.2

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes The Company used the Annual Effective Tax Rate ("ETR") approach of ASC 740-270, Interim Reporting, to calculate its 2021 interim tax provision. Income tax was an expense of $2.6 million and $12.0 million for the three months ended June 30, 2021 and 2020, respectively. The income tax expense recorded for the three months ended June 30, 2021 primarily relates to the projected expense as calculated under ASC 740 for tax paying entities. Additionally, the tax benefits associated with losses generated by the HC2 Holdings, Inc. U.S. consolidated income tax return and certain other businesses have been reduced by a full valuation allowance as we do not believe it is more-likely-than-not that the losses will be utilized prior to expiration. The income tax expense recorded for the three months ended June 30, 2020 primarily relates to tax expense incurred in China from the partial sale of HMN and projected expense as calculated under ASC 740 for tax paying entities. Income tax was an expense of $3.7 million and $2.3 million for the six months ended June 30, 2021 and 2020, respectively. The income tax expense recorded for the six months ended June 30, 2021 primarily relates to the projected expense as calculated under ASC 740 for tax paying entities. Additionally, the tax benefits associated with losses generated by the HC2 Holdings, Inc. U.S. consolidated income tax return and certain other businesses have been reduced by a full valuation allowance as we do not believe it is more-likely-than-not that the losses will be utilized prior to expiration. The income tax expense recorded for the six months ended June 30, 2020 primarily relates to tax expense incurred in China from the partial sale of HMN and projected expense as calculated under ASC 740 for tax paying entities which was mostly offset by a tax benefit from the carryback of net operating losses at the Insurance segment as a result of the enactment of the CARES Act. Net Operating Losses At December 31, 2020, the Company had gross U.S. net operating loss carryforwards available to reduce future taxable income in the amount of $170.3 million, of which a portion is subject to annual limitation under IRC Sec. 382. Based on estimates as of June 30, 2021, the Company expects that approximately $96.0 million of the gross U.S. net operating loss carryforwards would be available to offset taxable income in 2021. This estimate may change based on changes to the quarterly forecasts and actual results reported on the 2020 U.S. tax return. Additionally, at December 31, 2020, the Company had $112.6 million of gross U.S. net operating loss carryforwards from its subsidiaries that do not qualify to be included in the HC2 Holdings, Inc. U.S. consolidated income tax return. This balance includes $29.3 million from ANG which was sold during the first quarter of 2021. Unrecognized Tax Benefits The Company follows the provision of ASC 740-10, Income Taxes, which prescribes a comprehensive model for how a company should recognize, measure, present, and disclose in its financial statements uncertain tax positions that the Company has taken or expects to take on a tax return. The Company is subject to challenge from various taxing authorities relative to certain tax planning strategies, including certain intercompany transactions as well as regulatory taxes. The Company did not have any unrecognized tax benefits as of December 31, 2020 related to uncertain tax positions that would impact the effective income tax rate if recognized. The Company has reduced the net operating loss carryforward by $69.6 million for uncertain tax positions based on our interpretation of tax laws and regulations that are subject to varied interpretation by the IRS. Examinations The Company conducts business globally, and as a result, the Company or one or more of its subsidiaries files income tax returns in the United States federal jurisdiction and various state and foreign jurisdictions. In the normal course of business the Company is subject to examination by taxing authorities throughout the world. The open tax years contain matters that could be subject to differing interpretations of applicable tax laws and regulations as they relate to the amount, character, timing or inclusion of revenue and expenses or the applicability of income tax credits for the relevant tax period. Given the nature of tax audits there is a risk that disputes may arise. Tax years 2002 - 2020 remain open for examination. CARES Act Payroll Tax Deferral

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	13. Commitments and Contingencies Litigation The Company is subject to claims and legal proceedings that arise in the ordinary course of business. Such matters are inherently uncertain, and there can be no guarantee that the outcome of any such matter will be decided favorably to the Company or that the resolution of any such matter will not have a material adverse effect upon the Company’s Condensed Consolidated Financial Statements. The Company does not believe that any of such pending claims and legal proceedings will have a material adverse effect on its Condensed Consolidated Financial Statements. The Company records a liability in its Condensed Consolidated Financial Statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in a liability and the amount of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss to the extent necessary for its Condensed Consolidated Financial Statements not to be misleading. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in the Company's Condensed Consolidated Financial Statements. Based on a review of the current facts and circumstances with counsel in each of the matters disclosed, management has provided for what is believed to be a reasonable estimate of loss exposure. While acknowledging the uncertainties of litigation, management believes that the ultimate outcome of litigation will not have a material effect on its financial position and will defend itself vigorously. VAT assessment On February 20, 2017, and on August 15, 2017, the Company's subsidiary, PTGi International Carrier Services Ltd., received notices from Her Majesty’s Revenue and Customs office in the U.K. (the "HMRC") indicating that it was required to pay certain Value-Added Taxes ("VAT") for the 2015 and 2016 tax years. The Company disagrees with HMRC’s assessments on technical and factual grounds and intends to dispute the assessed liabilities and vigorously defend its interests. We do not believe the assessment to be probable and expect to prevail based on the facts and merits of our existing VAT position. Fair Value Investments Litigation On October 1, 2020, Fair Value Investments Incorporated (“FVI”) filed a putative stockholder class action and derivative complaint in the Delaware Court of Chancery against HC2 and certain of DBMG’s current and former officers and directors, including current and former HC2 officers and directors AJ Stahl, Kenneth S. Courtis, Robert V. Leffler, Jr., Philip A. Falcone, Michael J. Sena, and Paul Voigt (together with HC2, the “HC2 Defendants”) styled Fair Value Investments Incorporated v. Roach, et al., C.A. No. 2020-0847-JTL (Del. Ch.) (the “FVI Action”). In the FVI Action, FVI alleges that HC2, in its capacity as DBMG’s controlling stockholder, and DBMG’s current and former officers and directors breached their fiduciary duties to DBMG and DBMG’s minority stockholders by approving certain transactions that allegedly provide disproportionate benefits to HC2. FVI challenges the following transactions: (i) DBMG’s payments to HC2 from 2016–present pursuant to a Tax Sharing Agreement between DBMG and HC2; (ii) DBMG acting as a guarantor or providing collateral for loans taken on by HC2; (iii) DBMG’s issuance of dividends to its common and preferred stockholders in 2017–2020; (iv) DBMG’s issuance of preferred stock to HC2 to finance DBMG’s 2018 acquisition of GrayWolf Industrial; and (v) HC2’s appointment of directors to DBMG’s board of directors by written consent in lieu of holding an annual stockholder meeting. On February 23, 2021, FVI filed an Amended Verified Stockholder Class Action Complaint (the "Amended Complaint"). In the Amended Complaint, FVI named two additional defendants: HC2’s Chief Executive Officer, Wayne Barr, and DBMG’s General Counsel, Scott D. Sherman. The Amended Complaint includes additional fact allegations in support of the largely similar claims raised in the original complaint. Defendants moved to dismiss the Amended Complaint on April 23, 2021. HC2 believes the allegations in the FVI Amended Complaint are without merit and the HC2-related defendants have filed a motion to dismiss the complaint, which continues to be pending. HC2 intends to vigorously defend this litigation. DTV Derivative Litigation On March 15, 2021, twenty-two DTV America Corporation (“DTV”) stockholders and eight holders of DTV stock options filed a stockholder class action and derivative complaint in the Delaware Court of Chancery in an action styled Bocock, et al., v. HC2 Holdings, Inc. et al., C.A. No. 2021-0224 (Del. Ch.). Plaintiffs named as defendants HC2 Holdings, Inc., HC2 Broadcasting Holdings, Inc., HC2 Broadcasting Inc., and Continental General Insurance Corporation (the “HC2 Entities”) and certain current and former officers and directors of the HC2 Entities and DTV, including Phillip Falcone, Michael Sena, Wayne Barr, Jr., Les Levi, Paul Voigt, Ivan Minkov, and Paul Robinson (the “Individual Defendants”). Plaintiffs principally allege that the defendants breached their fiduciary duties and/or aided and abetted breaches of fiduciary duty by participating in a “scheme” in which the HC2 Entities (i) acquired majority voting and operating control over DTV; (ii) exploited that control to misappropriate DTV’s assets and business opportunities for the benefit of the HC2 Entities; and (iii) purchased DTV stock at a discount to fair value and diminished the value of DTV stock options. Plaintiffs allege that the Individual Defendants (i) “prompted” the HC2 Entities to purchase more than 100 low-power television (“LPTV”) broadcast stations originally identified for potential acquisition by DTV, (ii) allowed the HC2 Entities to misappropriate DTV technology, known as “DTV Cast,” (iii) caused DTV to transfer unspecified LPTV broadcasting station licenses to HC2 affiliates “without paying any value,” and (iv) transferred to the HC2 Entities unspecified DTV broadcasting stations that had been “repacked” by the FCC. Defendants moved to dismiss the Complaint on May 19, 2021. On June 23, 2021, plaintiffs amended their complaint. In the amended complaint, plaintiffs assert the same claims they asserted in their initial complaint, added a claim for waste associated with DTV’s purported transfer of licenses and construction permits for less than fair value, and dropped Paul Robinson as a defendant. HC2 believes the allegations in the amended complaint are without merit and the HC2-related defendants intend to move to dismiss the amended complaint. HC2 intends to vigorously defend this litigation. Separation from Philip A. Falcone The Company has engaged in ongoing negotiations with Philip A. Falcone, the former Chairman, President and Chief Executive Officer of the Company, regarding his separation. On December 18, 2020, Mr. Falcone filed a demand for arbitration against the Company with the American Arbitration Association. The Company filed its Answering Statement and Counterclaims with the AAA on March 5, 2021. The Company contends that the claims in Mr. Falcone’s demand are without merit and that the Company has both factual and legal defenses. Mr. Falcone filed his Answer to the Company’s Counterclaims on March 19, 2021. The Company and Mr. Falcone mediated on July 14, 2021, and on July 19, 2021, both the Company and Mr. Falcone accepted the mediator’s proposal, and the Company has reserved for an amount consistent with the mediator’s proposal. Books and Records Demand On July 28, 2021, the Company received a demand from a company stockholder pursuant to 8 Del. C. § 220 to inspect books and records of the Company relating to, among other things, the Company's sale of its Insurance segment. The Company is currently evaluating a response, and cannot determine at this time if the books and records demand will lead to litigation. Tax Matters Currently, the Canada Revenue Agency ("CRA") is auditing a subsidiary previously held by the Company. The Company intends to cooperate in audit matters. To date, CRA has not proposed any specific adjustments and the audit is ongoing.

Share-based Compensation

Share-based Compensation	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Share-based Compensation	14. Share-based Compensation Total share-based compensation expense recognized by the Company and its subsidiaries under all equity compensation arrangements was $1.1 million and $1.5 million for the six months ended June 30, 2021 and 2020, respectively. All grants are time based and vest either immediately or over a period established at grant. The Company recognizes compensation expense for equity awards, reduced by actual forfeitures, using the straight-line basis. Restricted Stock A summary of HC2’s restricted stock activity is as follows: Shares Weighted Average Grant Date Fair Value Unvested - December 31, 2019 2,213,775 $ 5.12 Granted 1,152,202 $ 2.74 Vested (2,258,905) $ 4.08 Forfeited (478,639) $ 5.87 Unvested - December 31, 2020 628,433 $ 3.93 Granted 593,458 $ 3.81 Vested (425,222) $ 3.74 Forfeited (31,171) $ 2.62 Unvested - June 30, 2021 765,498 $ 4.00 At June 30, 2021, the total unrecognized stock-based compensation expense related to unvested restricted stock was $2.0 million. The unrecognized compensation cost is expected to be recognized over the remaining weighted average period of 2.2 years. Stock Options A summary of HC2’s stock option activity is as follows: Shares Weighted Average Exercise Price Outstanding - December 31, 2019 7,067,592 $ 6.52 Granted 143,096 $ 2.62 Exercised — $ — Forfeited (142,503) $ 5.45 Expired (2,328,327) $ 9.18 Outstanding - December 31, 2020 4,739,858 $ 5.13 Granted — $ — Exercised — $ — Forfeited — $ — Expired (21,599) $ 5.45 Outstanding - June 30, 2021 4,718,259 $ 5.13 Eligible for exercise 4,716,909 $ 5.13 At June 30, 2021, the intrinsic value and average remaining life of the Company's outstanding options were $0.2 million and approximately 3.1 years, and intrinsic value and average remaining life of the Company's exercisable options were $0.2 million and approximately 3.1 years. At June 30, 2021, the total unrecognized stock-based compensation expense related to unvested stock options was $0.1 million. The unrecognized compensation cost is expected to be recognized over the remaining weighted average period of 0.7 years. There are 1,350 unvested stock options expected to vest, with a weighted average remaining life of 7.7 years, a weighted average exercise price of $2.62, and an intrinsic value of $0.1 million.

Equity

Equity	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Equity	15. Equity Preferred Shares The Company’s preferred shares authorized, issued and outstanding consisted of the following: June 30, December 31, Preferred shares authorized, $0.001 par value 20,000,000 20,000,000 Series A shares issued and outstanding (1) — 6,375 Series A-2 shares issued and outstanding (1) — 4,000 (1) CGI, a wholly owned subsidiary of the Company, owns 6,125 shares of Series A Preferred Stock and 10,000 shares of Series A-2 Preferred Stock which are eliminated in consolidation. Preferred Share Activity Series A Shares CGI Purchase On December 18, 2018, and December 20, 2018, CGI, a wholly owned subsidiary of the Company closed on the purchase of 6,125 shares of Series A Preferred Stock, which, as of June 30, 2021, is convertible into a total of 1,763,706 shares of the Company's common stock. The shares and dividends accrued related to the Series A Preferred Stock owned by CGI are eliminated in consolidation. On January 11, 2019, CGI purchased 10,000 shares of Series A-2 Preferred Stock, which, as of June 30, 2021, is convertible into a total of 1,872,659 shares of the Company's common stock. The shares and dividends accrued related to the Series A-2 Preferred Stock owned by CGI are eliminated in consolidation. Luxor and Corrib Conversions On August 2, 2016, the Company entered into separate agreements with each of Corrib Master Fund, Ltd. ("Corrib"), then a holder of 1,000 shares of Series A Preferred Stock, and certain investment entities managed by Luxor Capital Group, LP ("Luxor"), that together then held 9,000 shares of Series A-1 Preferred Stock. In conjunction with the conversions, the Company agreed to provide the following two forms of additional consideration for as long as the Preferred Stock remained entitled to receive dividend payments (the "Additional Share Consideration"): • The Company agreed that in the event that Corrib and Luxor would have been entitled to any Participating Dividends payable, had they not converted the Preferred Stock (as defined in the respective Series A and Series A-1 Certificate of Designation), after the date of their Preferred Share conversion, then the Company will issue to Corrib and Luxor, on the date such Participating Dividends become payable by the Company, in a transaction exempt from the registration requirements of the Securities Act the number of shares of common stock equal to (a) the value of the Participating Dividends Corrib or Luxor would have received pursuant to Sections (2)(c) and (2)(d) of the respective Series A and Series A-1 Certificates of Designation, divided by (b) the Thirty Day VWAP (as defined in the respective Series A and Series A-1 Certificates of Designation) for the period ending two • The Company agreed that it will issue to Corrib and Luxor, on each quarterly anniversary commencing May 29, 2017 (or, if later, the date on which the corresponding dividend payment is made to the holders of the outstanding Preferred Stock), through and until the Maturity Date (as defined in the respective Series A and Series A-1 Certificates of Designation), in a transaction exempt from the registration requirements of the Securities Act the number of shares of common stock equal to (a) 1.875% the Accrued Value (as defined in the respective Series A and Series A-1 Certificates of Designation) of Corrib’s or Luxor’s Preferred Stock as of the Closing Date (as defined in applicable Voluntary Conversion Agreements) divided by (b) the Thirty Day VWAP (as defined in the respective Series A and Series A-1 Certificate of Designation) for the period ending two For the six months ended June 30, 2021, 119,784 and 13,477 shares of the Company's common stock have been issued to Luxor and Corrib, respectively, in conjunction with the conversion agreements. For the six months ended June 30, 2020, 159,400 and 17,933 shares of the Company's common stock have been issued to Luxor and Corrib, respectively, in conjunction with the conversion agreements. The fair value of the Additional Share Consideration for the six months ended June 30, 2021 was valued by the Company at $0.3 million and for the six months ended June 30, 2020 was valued by the Company at $0.4 million on the date of issuance and was recorded within Preferred stock and deemed dividends from conversion line item of the Condensed Consolidated Statements of Operations as a deemed dividend. On May 29, 2021, pursuant to the terms of the Additional Share Consideration, the final Participating Dividend payments were made to Luxor and Corrib. Redemption and Conversion of Series A and A-2 Shares On May 29, 2021, pursuant to the Certificate of Designation, holders of the Series A and A-2 Preferred Stock caused the Company to redeem the Series A and A-2 Preferred Stock at the accrued value per share plus accrued but unpaid dividends (to the extent not included in the accrued value of Series A and A-2 Preferred Stock), of which $10.4 million was paid in cash to holders of the Series A and A-2 Preferred Stock. Each share of Series A and A-2 Preferred Stock that was not so redeemed was automatically converted into shares of common stock at the conversion price then in effect, of which 50,410 shares of the Company's common stock were issued in lieu of cash to holders of the Series A Preferred Stock. In connection with the Stock Purchase Agreement, CGI, a wholly owned subsidiary of the Company, entered into a letter agreement with Continental General Holdings, LLC to not redeem at maturity or seek redemption of the $16.1 million Preferred Stock. On July 1, 2021, subsequent to quarter end, CGI exchanged their Series A and Series A-2 Preferred Stock for new classes of Series A-3 and Series A-4 Preferred Stock with an extended maturity of July 1, 2026, with other terms substantially unchanged from the terms of the Series A and Series A-2 Preferred Stock. Preferred Share Dividends During the six months ended June 30, 2021 and 2020, HC2's Board of Directors declared cash dividends with respect to HC2’s issued and outstanding Preferred Stock, excluding Preferred Stock owned by CGI which is eliminated in consolidation, as presented in the following table (in millions): 2021 Declaration Date March 31, 2021 May 29, 2021 Holders of Record Date March 31, 2021 May 29, 2021 Payment Date April 15, 2021 June 4, 2021 Total Dividend $ 0.2 $ 0.1 2020 Declaration Date March 31, 2020 June 30, 2020 Holders of Record Date March 31, 2020 June 30, 2020 Payment Date April 15, 2020 July 15, 2020 Total Dividend $ 0.2 $ 0.2

Related Parties

Related Parties	6 Months Ended
	Jun. 30, 2021
Related Party Transactions [Abstract]
Related Parties	16. Related Parties Non-Operating Corporate Pansend has an investment in Triple Ring Technologies, Inc. ("Triple Ring"). Various subsidiaries of HC2 utilize the services of Triple Ring, incurring zero and $0.3 million in services for the three months ended June 30, 2021 and 2020, and zero and $1.0 million in services for the six months ended June 30, 2021 and 2020, respectively. In September 2018, the Company entered into a 75-month lease for office space. As part of the agreement, HC2 was able to pay a lower security deposit and lease payments, and received favorable lease terms as consideration for landlord required cross default language in the event of default of the shared space leased by Harbinger Capital Partners, formerly a related party, in the same building. With the adoption of ASC 842, as of January 1, 2019, this lease was recognized as a right of use asset and lease liability on the Condensed Consolidated Balance Sheets. Infrastructure Banker Steel, a subsidiary of DBMG, has leased two office spaces from 2940 Fulks St LLC, a related party that is owned by Donald Banker, CEO of Banker Steel and a related party, with monthly lease payments of $10 thousand and a total lease liability of $0.2 million. For the three months ended June 30, 2021, and 2020, DBMG incurred lease expense of $10 thousand and zero, respectively, and for the six months ended June 30, 2021, and 2020, DBMG incurred lease expense of $10 thousand and zero, respectively. Banker Steel has leased two planes from Banker Aviation LLC, a related party that is owned by Donald Banker, a related party, with monthly lease payments of $0.2 million and a total lease liability of $4.5 million. For the three months ended June 30, 2021, and 2020, DBMG incurred lease expense of $0.2 million and zero, respectively, and for the six months ended June 30, 2021, and 2020, DBMG incurred lease expense of $0.2 million and zero, respectively.

Operating Segment and Related I

Operating Segment and Related Information	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Operating Segment and Related Information	17. Operating Segment and Related Information The Company currently has one primary reportable geographic segment - United States. The Company has four reportable operating segments, plus our Other segment, based on management’s organization of the enterprise - Infrastructure, Life Sciences, Spectrum, Insurance, and Other. We also have included a Non-operating Corporate segment. All inter-segment revenues are eliminated. As a result of the sale of GMSL, ICS, and Beyond6, and in accordance with ASC 280, the Company no longer considers the results of operations and balance sheets of these entities and related subsidiaries as separate segments. Formerly part of the Marine Services, Telecommunications, and Clean Energy segments, these entities and the investment in HMN have been reclassified to the Other segment. In addition, as GMSL, ICS, Beyond6, and CIG are discontinued operations, all operating results of these entities have been reclassified to discontinued operations. This has been reflected in the tables below for both the current and historical periods presented. Summary information with respect to the Company’s operating segments is as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenue Infrastructure $ 232.0 $ 172.3 $ 393.3 $ 348.8 Life Sciences 1.2 — 1.2 — Spectrum 10.6 9.5 21.1 19.6 Total revenue $ 243.8 $ 181.8 $ 415.6 $ 368.4 Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Income (loss) from operations Infrastructure $ 2.2 $ 4.5 $ 4.4 $ 7.1 Life Sciences (4.5) (3.5) (9.3) (6.7) Spectrum 1.4 (1.2) 0.2 (4.1) Other (0.2) (0.7) (0.6) (1.7) Non-operating Corporate (6.6) (8.0) (13.3) (17.1) Total loss from operations $ (7.7) $ (8.9) $ (18.6) $ (22.5) A reconciliation of the Company's consolidated segment operating income to consolidated earnings before income taxes is as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Loss from operations $ (7.7) $ (8.9) $ (18.6) $ (22.5) Interest expense (12.4) (19.1) (33.8) (38.3) Loss on early extinguishment or restructuring of debt (1.6) (3.4) (12.4) (9.2) Income (loss) from equity investees 0.2 (0.2) (1.9) (2.7) Other income 0.4 64.6 3.8 66.1 (Loss) income from continuing operations before income taxes (21.1) 33.0 (62.9) (6.6) Income tax expense (2.6) (12.0) (3.7) (2.3) (Loss) income from continuing operations (23.7) 21.0 (66.6) (8.9) (Loss) income from discontinued operations (including gain on disposal of $40.4 million and loss on disposal of $39.3 million for the six months ended June 30, 2021 and 2020, respectively) (1.5) 7.5 50.4 (63.6) Net (loss) income (25.2) 28.5 (16.2) (72.5) Net income (loss) attributable to noncontrolling interest and redeemable noncontrolling interest 1.7 (15.4) 5.3 2.5 Net (loss) income attributable to HC2 Holdings, Inc. (23.5) 13.1 (10.9) (70.0) Less: Preferred dividends and deemed dividends from conversions 0.2 0.4 0.6 0.8 Net (loss) income attributable to common stock and participating preferred stockholders $ (23.7) $ 12.7 $ (11.5) $ (70.8) Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Depreciation and Amortization Infrastructure $ 3.3 $ 2.7 $ 5.7 $ 5.3 Life Sciences 0.1 0.1 0.1 0.1 Spectrum 1.4 1.7 2.9 3.4 Total 4.8 4.5 8.7 8.8 Depreciation expense recognized within cost of revenue 2.8 2.3 5.0 4.6 Total depreciation and amortization $ 7.6 $ 6.8 $ 13.7 $ 13.4 Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Capital Expenditures (*) Infrastructure $ 3.9 $ 1.1 $ 5.5 $ 3.4 Life Sciences 0.3 0.1 0.5 0.1 Spectrum 0.6 3.7 2.0 6.4 Non-operating Corporate — 0.1 — 0.1 Total $ 4.8 $ 5.0 $ 8.0 $ 10.0 (*) The above capital expenditures exclude assets acquired under terms of capital lease and vendor financing obligations. June 30, December 31, Investments Infrastructure $ 0.9 $ 0.9 Life Sciences 15.1 18.4 Other 37.1 36.1 Total $ 53.1 $ 55.4 June 30, December 31, Total Assets Infrastructure $ 858.9 $ 494.8 Life Sciences 20.4 21.4 Spectrum 206.0 213.6 Insurance 5,849.0 5,854.0 Other 40.8 167.3 Non-operating Corporate 4.2 30.1 Eliminations (43.4) (38.4) Total $ 6,935.9 $ 6,742.8

Basic and Diluted Income (Loss)

Basic and Diluted Income (Loss) Per Common Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Basic and Diluted Income Per Common Share	18. Basic and Diluted Income (Loss) Per Common Share Earnings per share ("EPS") is calculated using the two-class method, which allocates earnings among common stock and participating securities to calculate EPS when an entity's capital structure includes either two or more classes of common stock or common stock and participating securities. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities. As such, shares of any unvested restricted stock of the Company are considered participating securities. The dilutive effect of options and their equivalents (including non-vested stock issued under stock-based compensation plans), is computed using the "treasury" method as this measurement was determined to be more dilutive between the two available methods in each period. The Company had no dilutive common share equivalents during the six months ended June 30, 2021 and 2020 due to results from continuing operations being a loss, net of tax. The following table presents a reconciliation of net income (loss) used in basic and diluted EPS calculations (in millions, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (Loss) income from continuing operations $ (23.7) $ 21.0 $ (66.6) $ (8.9) Income (loss) attributable to noncontrolling interest and redeemable noncontrolling interest 1.6 (15.3) 4.4 (12.5) (Loss) income from continuing operations attributable to the Company (22.1) 5.7 (62.2) (21.4) Less: Preferred dividends, deemed dividends and repurchase gains 0.2 0.4 0.6 0.8 (Loss) income from continuing operations attributable to HC2 common stockholders (22.3) 5.3 (62.8) (22.2) (Loss) income from discontinued operations (1.5) 7.5 50.4 (63.6) (Loss) income attributable to noncontrolling interest and redeemable noncontrolling interest 0.1 (0.1) 0.9 15.0 (Loss) income from discontinued operations, net of tax and noncontrolling interest (1.4) 7.4 51.3 (48.6) Net (loss) income attributable to common stock and participating preferred stockholders $ (23.7) $ 12.7 $ (11.5) $ (70.8) Earnings allocable to common shares: Participating shares at end of period: Weighted-average common stock outstanding 77.0 46.8 77.1 45.9 Unvested restricted stock 0.3 Preferred stock (as-converted basis) 2.1 Total 77.0 49.2 77.1 45.9 Percentage of loss allocated to: Common stock 100.0 % 95.1 % 100.0 % 100.0 % Unvested restricted stock — % 0.6 % — % — % Preferred stock — % 4.3 % — % — % Numerator for earnings per share, basic: Net (loss) income from continuing operations attributable to common stock, basic $ (22.3) $ 5.0 $ (62.8) $ (22.2) Net (loss) income from discontinued operations attributable to common stock, basic $ (1.4) $ 7.1 $ 51.3 $ (48.6) Net (loss) income attributable to common stock, basic $ (23.7) $ 12.1 $ (11.5) $ (70.8) Earnings allocable to common shares, diluted: Numerator for earnings per share, diluted Effect of assumed shares under the if-converted method for convertible instruments $ — $ — $ — $ — Net (loss) income from continuing operations attributable to common stock, basic $ (22.3) $ 5.0 $ (62.8) $ (22.2) Net (loss) income from discontinued operations attributable to common stock, basic $ (1.4) $ 7.1 $ 51.3 $ (48.6) Net (loss) income attributable to common stock, basic $ (23.7) $ 12.1 $ (11.5) $ (70.8) Denominator for basic and dilutive earnings per share Weighted average common shares outstanding - basic 77.0 46.8 77.1 45.9 Effect of assumed shares under treasury stock method for stock options and restricted shares and if-converted method for convertible instruments — 2.0 — — Weighted average common shares outstanding - diluted 77.0 48.8 77.1 45.9 (Loss) income per share - continuing operations Basic $ (0.29) $ 0.11 $ (0.82) $ (0.48) Diluted $ (0.29) $ 0.11 $ (0.82) $ (0.48) (Loss) income per share - discontinued operations Basic $ (0.02) $ 0.15 $ 0.67 $ (1.06) Diluted $ (0.02) $ 0.14 $ 0.67 $ (1.06) (Loss) income per share - Net (loss) income attributable to common stock and participating preferred stockholders Basic $ (0.31) $ 0.26 $ (0.15) $ (1.54) Diluted $ (0.31) $ 0.25 $ (0.15) $ (1.54)

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events On July 1, 2021, the Company completed the previously announced sale of its insurance segment, comprised of CIG and its wholly-owned subsidiaries, Continental General Insurance Company and Continental LTC Inc., to Continental General Holdings LLC, an entity controlled by Michael Gorzynski, a director of the Company and, as of June 30, 2021, a beneficial owner of approximately 6.6% of the Company's outstanding common stock who has also served as executive chairman of Continental since October 2020. The total transaction value of approximately $90.0 million consists of a combination of $65.0 million in cash plus securities plus certain assets at CGI. On July 1, 2021, CGI exchanged their Series A and Series A-2 Preferred Stock for new classes of Series A-3 and A-4 Preferred Stock with an extended maturity of July 1, 2026 and a redemption option at the Company's discretion, with other terms substantially unchanged from the terms in the Series A and Series A-2 Preferred Stock. Concurrently with the sale of CGI and the exchange of the Series A and Series A-2 Preferred stock for new classes of Series A-3 and A-4 Preferred Stock, Michael Gorzynski, a director of the Company and executive chairman of Continental, increased his beneficial ownership of the Company's outstanding common stock to 10.8%. On July 14, 2021, HC2 Broadcasting had entered into an Asset Purchase Agreement for $6.5 million to sell its non-core channel share agreement. On August 2, 2021, HC2 Broadcasting finalized the sale of two of its non-core full power stations for $4.0 million. On July 21, 2021, the Company provided an additional $15.0 million in Series C funding to R2 Technologies Inc. at a post-money valuation of $150.0 million. The investment was made through HC2’s Life Sciences subsidiary, Pansend Life Sciences, LLC, increasing the Company's fully diluted ownership to 50.4%.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The Condensed Consolidated Financial Statements include the accounts of the Company, its wholly owned subsidiaries and all other subsidiaries over which the Company exerts control. All intercompany profits, transactions and balances have been eliminated in consolidation. As of June 30, 2021, the results of DBMG, Genovel, R2, HC2 Broadcasting, CIG, GMH and Beyond6 have been consolidated into the Company’s results based on guidance from the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC" 810, Consolidation)
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of the Company included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). The financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair statement of such information. All such adjustments are of a normal recurring nature. Certain information and note disclosures, including a description of significant accounting policies normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP"), have been condensed or omitted pursuant to such rules and regulations. Certain prior amounts have been reclassified or combined to conform to the current year presentation. These interim financial statements should be read in conjunction with the Company’s annual Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, filed with the SEC on March 10, 2021. The results of operations for the three and six months ended June 30, 2021 are not necessarily indicative of the results for any subsequent periods or the entire fiscal year ending December 31, 2021.
Use of Estimates and Assumptions	Use of Estimates and Assumptions The preparation of the Company’s Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions used.
Reclassification	Reclassification Certain previous year amounts have been reclassified to conform with current year presentations, as related to the reporting of new balance sheet line items: • The recast of Beyond6, ICS, and CIG's results to discontinued operations. Further, the reclassification of prior period assets and liabilities have been classified as held for sale. See Note 3. Discontinued Operations for further information; • As a result of the sale of ICS, and in accordance with ASC 280, the Company no longer considers the results of operations and Balance Sheets of the retained ICS entities as a separate segment. Formerly the Telecommunications segment, these entities have been reclassified to the Other segment. See Note 17. Operating Segment and Related Information for further information; • As a result of the sale of Beyond6, and in accordance with ASC 280, the Company no longer considers the results of operations and Balance Sheets of Beyond6 as a separate segment. Formerly the Clean Energy segment, this entity has been reclassified to the Other segment. See Note 17. Operating Segment and Related Information for further information; and • The recast of prior year earnings per share as a result of the discontinued operations noted above. This includes presenting EPS for Net income (loss) from continuing operations, Net income (loss) from discontinuing operations, and Net income (loss). See Note 18. Basic and Diluted Income (Loss) Per Common Share for further details. • Certain 2021 statement of cash flow items have been reclassified to conform to the current financial statement presentation. These reclassifications have no effect on previously reported net income.
Accounting Pronouncements	Accounting Pronouncements Adopted in the Current Year Accounting for Debt with Conversion Options ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470- 20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity , was issued by the FASB in August 2020. This ASU (1) simplifies the accounting for convertible debt instruments and convertible preferred stock by removing the existing guidance in ASC 470-20, Debt: Debt with Conversion and Other Options , that requires entities to account for beneficial conversion features and cash conversion features in equity, separately from the host convertible debt or preferred stock; (2) revises the scope exception from derivative accounting in ASC 815-40 for freestanding financial instruments and embedded features that are both indexed to the issuer’s own stock and classified in stockholders’ equity, by removing certain criteria required for equity classification; and (3) revises the guidance in ASC 260, Earnings Per Share , to require entities to calculate diluted earnings per share (EPS) for convertible instruments by using the if-converted method. In addition, entities must presume share settlement for purposes of calculating diluted EPS when an instrument may be settled in cash or shares. The standard is effective on January 1, 2024, but early adoption was elected as of January 1, 2021. A modified retrospective method of transition was applied, which resulted in no impact to the Company. Accounting Pronouncements to be Adopted Subsequent to December 31, 2021 Credit Loss Standard ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) , Measurement of Credit Losses on Financial Instruments, was issued by FASB in June 2016. This standard is effective January 1, 2020 (with early adoption permitted). This new standard changes the impairment model for most financial assets that are measured at amortized cost and certain other instruments, including trade receivables, from an incurred loss model to an expected loss model and adds certain new required disclosures. Under the expected loss model, entities will recognize estimated credit losses over the entire contractual term of the instrument rather than delaying recognition of credit losses until it is probable the loss has been incurred. The FASB has voted to delay the effective date of ASU 2016-13 to January 1, 2023 for smaller reporting companies with a revised ASU in the fourth quarter of 2019. The Company will not be required to adopt Topic 326 until January 1, 2023. Currently, the Company continues to evaluate the potential impact of the new standard on its financial results. Subsequent Events ASC 855, Subsequent Events

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Schedule of Restricted Cash and Cash Equivalents	The following table provides a reconciliation of cash and cash equivalents and restricted cash to amounts reported within the Condensed Consolidated Balance Sheets and Condensed Consolidated Statements of Cash Flows (in millions): June 30, 2021 2020 Cash and cash equivalents, beginning of period $ 43.8 $ 23.3 Restricted cash included in other assets 1.5 1.4 Total cash and cash equivalents and restricted cash $ 45.3 $ 24.7 Cash and cash equivalents, end of period $ 18.1 $ 23.7 Restricted cash included in other assets 2.6 1.4 Total cash and cash equivalents and restricted cash $ 20.7 $ 25.1 Cash and cash equivalents classified in Assets held for sale, beginning of period $ 195.2 $ 216.0 Restricted cash classified in Assets held for sale 0.2 0.2 Total cash and cash equivalents and restricted cash classified in Assets held for sale $ 195.4 $ 216.2 Cash and cash equivalents classified in Assets held for sale, end of period $ 253.7 $ 180.3 Restricted cash classified in Assets held for sale — 0.2 Total cash and cash equivalents and restricted cash classified in Assets held for sale $ 253.7 $ 180.5 Supplemental cash flow information: Cash paid for interest $ 12.3 $ 33.0 Cash paid for taxes, net of refunds $ 2.6 $ 8.0 Non-cash investing and financing activities: Property, plant and equipment included in accounts payable $ 2.1 $ 4.9 Investments included in accounts receivable $ — $ 20.0 Investments included in accounts payable $ — $ 8.5 Extinguishment of convertible note in exchange $ 51.8 $ — Issuance of convertible note in exchange $ (51.8) $ — Debt assumed in acquisitions $ 6.3 $ —
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash and cash equivalents and restricted cash to amounts reported within the Condensed Consolidated Balance Sheets and Condensed Consolidated Statements of Cash Flows (in millions): June 30, 2021 2020 Cash and cash equivalents, beginning of period $ 43.8 $ 23.3 Restricted cash included in other assets 1.5 1.4 Total cash and cash equivalents and restricted cash $ 45.3 $ 24.7 Cash and cash equivalents, end of period $ 18.1 $ 23.7 Restricted cash included in other assets 2.6 1.4 Total cash and cash equivalents and restricted cash $ 20.7 $ 25.1 Cash and cash equivalents classified in Assets held for sale, beginning of period $ 195.2 $ 216.0 Restricted cash classified in Assets held for sale 0.2 0.2 Total cash and cash equivalents and restricted cash classified in Assets held for sale $ 195.4 $ 216.2 Cash and cash equivalents classified in Assets held for sale, end of period $ 253.7 $ 180.3 Restricted cash classified in Assets held for sale — 0.2 Total cash and cash equivalents and restricted cash classified in Assets held for sale $ 253.7 $ 180.5 Supplemental cash flow information: Cash paid for interest $ 12.3 $ 33.0 Cash paid for taxes, net of refunds $ 2.6 $ 8.0 Non-cash investing and financing activities: Property, plant and equipment included in accounts payable $ 2.1 $ 4.9 Investments included in accounts receivable $ — $ 20.0 Investments included in accounts payable $ — $ 8.5 Extinguishment of convertible note in exchange $ 51.8 $ — Issuance of convertible note in exchange $ (51.8) $ — Debt assumed in acquisitions $ 6.3 $ —

Discontinued Operations (Tables

Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	The results of GMSL, ICS, Beyond6, and CIG and the related expenses directly attributable to the entities were reported as discontinued operations. Summarized operating results of the discontinued operations are as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenue $ — $ 117.5 $ 1.7 $ 331.6 Life, accident and health earned premiums, net 27.3 29.5 55.7 58.2 Net investment income 48.5 48.4 92.4 100.3 Realized/unrealized (losses) gains on investments (4.4) (0.5) 5.1 (19.5) Total revenue 71.4 194.9 154.9 470.6 Cost of revenue — 110.1 0.8 317.5 Policy benefits, changes in reserves, and commissions 69.9 63.0 126.0 135.4 Selling, general and administrative 8.7 11.8 21.1 39.0 Depreciation and amortization (5.1) (3.3) (11.0) (3.3) (Loss) income from operations (2.1) 13.3 18.0 (18.0) Interest expense (0.1) (2.3) (0.5) (8.0) Gain (loss) on sale and liquidation of subsidiaries — — 40.4 (39.3) Income from equity investees — — — 0.5 Other (loss) income — (0.2) (3.1) 1.7 Pre-tax income (loss) from discontinued operations (2.2) 10.8 54.8 (63.1) Income tax benefit (expense) 0.7 (3.3) (4.4) (0.5) (Loss) income from discontinued operations $ (1.5) $ 7.5 $ 50.4 $ (63.6) As a result of the repayment of $15.0 million Revolving Credit Agreement, the Company allocated the following interest and the amortization of deferred financing costs for the three and six months ended June 30, 2021 and 2020 associated with the principal prepayment from continuing operations to discontinued operations on the Company’s Condensed Consolidated Statement of Operations: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest expense $ — $ — $ — $ 0.2 Amortization of deferred financing costs and original issuance discount $ — $ — $ — $ 0.1 As a result of the mandatory redemption of $76.9 million of 2021 Senior Secured Notes, the Company allocated the following pro-rata interest and amortization of deferred financing costs and original issuance discount for the three and six months ended June 30, 2021 and 2020, from continuing operations to discontinued operations on the Company’s Condensed Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest expense $ — $ — $ — $ 2.2 Amortization of deferred financing costs and original issuance discount $ — $ — $ — $ 0.2 As a result of the repayment of $15.0 million Revolving Credit Agreement, the Company allocated the following interest for the three and six months ended June 30, 2021 and 2020 associated with the principal prepayment from continuing operations to discontinued operations on the Company’s Condensed Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest expense $ — $ 0.2 $ 0.1 $ 0.2 As a result of the repayment of $27.9 million of the 2021 Senior Secured Notes, the Company allocated the following pro-rata interest and amortization of deferred financing costs and original issuance discount for the three and six months ended June 30, 2021 and 2020, from continuing operations to discontinued operations on the Company’s Condensed Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest expense $ — $ 0.8 $ 0.3 $ 1.6 Amortization of deferred financing costs and original issuance discount $ — $ 0.1 $ — $ 0.2 Summarized assets and liabilities of the discontinued operations are as follows (in millions): June 30, December 31, Assets Current assets Cash and cash equivalents $ 253.7 $ 195.2 Accounts receivable, net — 13.6 Other current assets 6.7 8.7 Total current assets 260.4 217.5 Investments 4,483.7 4,610.2 Recoverable from reinsurers 1,015.2 957.5 Deferred tax asset — 1.4 Property, plant and equipment, net 1.4 90.5 Goodwill — 2.1 Intangibles, net 2.5 11.7 Other assets 44.0 51.2 Total assets held for sale $ 5,807.2 $ 5,942.1 Liabilities Current liabilities Accounts payable $ — $ 2.6 Accrued liabilities 8.8 35.8 Current portion of debt obligations — 5.7 Other current liabilities 3.6 7.4 Total current liabilities 12.4 51.5 Life, accident and health reserves 4,711.7 4,627.5 Annuity reserves 225.8 228.8 Value of business acquired 188.3 199.8 Deferred tax liability 114.8 136.5 Debt obligations — 50.6 Other liabilities 8.6 12.0 Total liabilities held for sale $ 5,261.6 $ 5,306.7 In addition, as of June 30, 2021, the Company had $5.2 million of assets from its Spectrum segment classified as Assets held for sale in continuing operations related to certain station licenses and assets.

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Reconciliation of Revenue from Segments to Consolidated	Revenue from contracts with customers consist of the following (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenue Infrastructure $ 232.0 $ 172.3 $ 393.3 $ 348.8 Spectrum 10.6 9.5 21.1 19.6 Life Sciences 1.2 — 1.2 — Total revenue $ 243.8 $ 181.8 $ 415.6 $ 368.4
Schedule of Accounts Receivable	Accounts receivables, net from contracts with customers consist of the following (in millions): June 30, December 31, Accounts receivables with customers Infrastructure $ 343.7 $ 168.5 Spectrum 8.5 7.3 Life Sciences 0.1 — Total accounts receivables with customers $ 352.3 $ 175.8 Accounts receivable, net consist of the following (in millions): June 30, December 31, Contracts in progress $ 250.5 $ 118.6 Unbilled retentions 93.8 50.3 Trade receivables 8.6 7.5 Other receivables 12.2 8.9 Allowance for doubtful accounts (0.5) (0.6) Total $ 364.6 $ 184.7
Disaggregation of Revenue	The following table disaggregates DBMG's revenue by market (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Commercial $ 84.8 $ 54.0 $ 134.3 $ 116.8 Industrial 79.0 59.6 119.2 118.4 Transportation 10.8 23.5 24.7 39.9 Government 17.2 11.1 38.5 19.7 Leisure 4.7 11.3 12.2 27.3 Healthcare 11.1 4.7 20.0 12.6 Convention 18.8 1.4 28.2 3.8 Other 5.6 6.1 16.2 9.7 Total revenue from contracts with customers 232.0 171.7 393.3 348.2 Other revenue — 0.6 — 0.6 Total Infrastructure segment revenue $ 232.0 $ 172.3 $ 393.3 $ 348.8 The following table disaggregates the Life Sciences segment's revenue by type (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Systems revenue $ 1.2 $ — $ 1.2 $ — Total Life Sciences segment revenue $ 1.2 $ — $ 1.2 $ — Spectrum Segment The following table disaggregates the Spectrum segment's revenue by type (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Network advertising $ 4.8 $ 4.0 $ 9.5 $ 9.0 Broadcast station 4.5 3.8 8.9 7.3 Network distribution 0.7 1.0 1.6 2.1 Other 0.6 0.7 1.1 1.2 Total Spectrum segment revenue $ 10.6 $ 9.5 $ 21.1 $ 19.6
Contract with Customer, Asset and Liability	Contract assets and contract liabilities consisted of the following (in millions): June 30, December 31, Costs and recognized earnings in excess of billings on uncompleted contracts $ 63.7 $ 55.6 Billings in excess of costs and recognized earnings on uncompleted contracts $ (146.8) $ (52.2)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The transaction price allocated to remaining unsatisfied performance obligations consisted of the following (in millions): Within one year Within five years Total Commercial $ 580.5 $ 620.2 $ 1,200.7 Industrial 201.3 — 201.3 Transportation 41.5 17.2 58.7 Government 47.3 — 47.3 Leisure 7.0 — 7.0 Healthcare 51.1 — 51.1 Convention 52.7 — 52.7 Other 5.6 — 5.6 Remaining unsatisfied performance obligations $ 987.0 $ 637.4 $ 1,624.4

Acquisitions, Dispositions, and

Acquisitions, Dispositions, and Deconsolidations (Tables)	6 Months Ended
	Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Purchase Price Allocation	The preliminary allocation of the fair value of consideration transferred among the identified assets acquired, liabilities assumed, intangibles and residual goodwill are summarized as follows (in millions): Purchase Consideration at Fair Value Partial draw on new $110.0 million revolving credit facility $ 64.1 Sellers' notes 49.6 Bankers Steel debt - assumed 6.3 Cash 25.0 Gross consideration 145.0 Less: Transaction costs 0.4 Less: Bankers debt - assumed 6.3 Less: R&W premium paid by seller 0.5 Net consideration $ 137.8 Cash and cash equivalents $ 9.3 Accounts receivable, net 111.3 Costs recognized in earnings in excess of billings on uncompleted contracts 1.9 Assets held for sale 0.7 Other current assets 7.3 Property, plant, and equipment, net 62.6 Other assets 40.2 Intangibles, net 58.5 Goodwill 10.3 Total assets to be acquired 302.1 Accounts Payable 39.1 Billings in excess of costs and recognized earnings on uncompleted contracts 55.0 Other current liabilities 29.6 Other liabilities 34.2 Long-term debt, less current portion 6.4 Total liabilities to be assumed 164.3 Total net assets acquired $ 137.8
Business Acquisition, Pro Forma Information	The following schedule presents the unaudited results of operations data for the three and six months ended June 30, 2021 for Banker Steel since the date of acquisition (in millions): Three Months Ended June 30, 2021 Six Months Ended June 30, 2021 Revenue $ 39.5 $ 39.5 Net income from operations $ 1.3 $ 1.3 Net income attributable to HC2 Holdings $ 0.6 $ 0.6 Pro Forma Adjusted Summary The following schedule presents unaudited consolidated pro forma results of operations data as if the acquisition of Banker Steel had occurred on January 1, 2020. This information does not purport to be indicative of the actual results that would have occurred if the acquisitions had actually been completed on the date indicated, nor is it necessarily indicative of the future operating results or the financial position of the combined company (in millions): Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Revenue $ 326.1 $ 252.5 $ 613.1 $ 517.0 Income (loss) from operations $ 1.5 $ (7.3) $ (7.1) $ (16.7) Net income (loss) attributable to HC2 Holdings $ (15.7) $ 10.5 $ (2.6) $ (70.3)

Accounts Receivable, net (Table

Accounts Receivable, net (Tables)	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Schedule of Accounts Receivable	Accounts receivables, net from contracts with customers consist of the following (in millions): June 30, December 31, Accounts receivables with customers Infrastructure $ 343.7 $ 168.5 Spectrum 8.5 7.3 Life Sciences 0.1 — Total accounts receivables with customers $ 352.3 $ 175.8 Accounts receivable, net consist of the following (in millions): June 30, December 31, Contracts in progress $ 250.5 $ 118.6 Unbilled retentions 93.8 50.3 Trade receivables 8.6 7.5 Other receivables 12.2 8.9 Allowance for doubtful accounts (0.5) (0.6) Total $ 364.6 $ 184.7

Property, Plant, and Equipmen_2

Property, Plant, and Equipment, net (Tables)	6 Months Ended
	Jun. 30, 2021
Property, Plant and Equipment [Abstract]
Summary of Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): June 30, December 31, Equipment, furniture and fixtures, and software $ 170.4 $ 113.7 Building and leasehold improvements 43.4 41.0 Land 24.1 24.1 Plant and transportation equipment 10.6 4.4 Construction in progress 7.6 3.1 256.1 186.3 Less: Accumulated depreciation 82.8 73.5 Total $ 173.3 $ 112.8

Goodwill and Intangibles, net (

Goodwill and Intangibles, net (Tables)	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of the Changes in the Carrying Amount of Goodwill by Reporting Unit	The carrying amount of goodwill by segment was as follows (in millions): Infrastructure Spectrum Total Balance at December 31, 2020 $ 89.6 $ 21.4 $ 111.0 Acquisitions 10.3 — 10.3 Translation (0.2) — (0.2) Balance at June 30, 2021 $ 99.7 $ 21.4 $ 121.1
Schedule of Indefinite-Lived Intangible Assets	The carrying amount of indefinite-lived intangible assets was as follows (in millions): June 30, 2021 December 31, 2020 FCC licenses $ 107.5 $ 113.0 Other — — Total $ 107.5 $ 113.0
Schedule of Intangible Assets Subject to Amortization	The gross carrying amount and accumulated amortization of amortizable intangible assets by major intangible asset class were as follows (in millions): Weighted-Average Original Useful Life June 30, 2021 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Trade names 14 years $ 25.4 $ (5.4) $ 20.0 $ 18.0 $ (4.6) $ 13.4 Customer relationships and contracts 11 years 85.4 (14.5) 70.9 36.4 (12.1) 24.3 Channel sharing arrangements 35 years 20.1 (1.9) 18.2 20.2 (1.6) 18.6 Other 8 years 8.4 (3.0) 5.4 5.5 (2.7) 2.8 Total $ 139.3 $ (24.8) $ 114.5 $ 80.1 $ (21.0) $ 59.1
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Excluding the impact of any future acquisitions, dispositions or change in foreign currency, the Company estimates the annual amortization expense of amortizable intangible assets for the next five fiscal years will be as follows (in millions): Estimated Amortization 2021 $ 7.8 2022 15.6 2023 11.1 2024 8.0 2025 7.3 Thereafter 64.7 Total $ 114.5

Debt Obligations (Tables)

Debt Obligations (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of Debt and Finance Lease Obligations	Debt obligations consist of the following (in millions): June 30, December 31, Infrastructure LIBOR plus 5.85% Note, due 2023 $ — $ 71.6 LIBOR plus 1.50% Line of Credit — 38.7 LIBOR plus 3.25% Note, due 2026 109.6 — LIBOR plus 2.15% Line of Credit 71.1 — 4.00% Note due 2024 27.5 — 8.00% Note due 2024 19.6 — Other, various maturity dates 6.5 — Obligations under finance leases 0.1 0.2 Spectrum 8.50% Note due 2021 19.3 19.3 10.50% Note due 2021 32.9 32.9 Other, various maturity dates 2.9 2.9 Obligations under finance leases 0.1 0.6 Non-Operating Corporate 11.50% Senior Secured Notes, due 2021 — 340.4 8.50% Senior Secured Notes, due 2026 330.0 — 7.50% Convertible Senior Notes, due 2022 3.2 55.0 7.50% Convertible Senior Notes, due 2026 51.8 — LIBOR plus 5.75% Line of Credit 5.0 15.0 679.6 576.6 Unamortized issuance discount, issuance premium, and deferred financing costs (3.1) (15.1) Less: current portion of debt obligations (70.2) (433.6) Debt obligations $ 606.3 $ 127.9
Schedule of Maturities of Debt and Finance Lease Obligations	Aggregate finance lease and debt payments, including interest are as follows (in millions): Finance Leases Debt Total 2021 $ 0.2 $ 71.5 $ 71.7 2022 — 57.6 57.6 2023 — 57.1 57.1 2024 — 142.2 142.2 2025 — 40.2 40.2 Thereafter — 507.5 507.5 Total minimum principal and interest payments 0.2 876.1 876.3 Less: Amount representing interest — (196.7) (196.7) Total aggregate finance lease and debt payments $ 0.2 $ 679.4 $ 679.6

Supplementary Financial Infor_2

Supplementary Financial Information (Tables)	6 Months Ended
	Jun. 30, 2021
Offsetting [Abstract]
Schedule of Costs and Recognized Earnings in Excess of Billings and Billings in Excess of Costs and Recognized Earnings on Uncompleted Contracts	Costs and recognized earnings in excess of billings on uncompleted contracts and billings in excess of costs and recognized earnings on uncompleted contracts consist of the following: June 30, December 31, Costs incurred on contracts in progress $ 1,611.6 $ 752.9 Estimated earnings 254.0 139.0 1,865.6 891.9 Less progress billings 1,948.7 888.5 $ (83.1) $ 3.4 The above is included in the accompanying condensed consolidated balance sheet under the following line items: Costs and recognized earnings in excess of billings on uncompleted contracts $ 63.7 $ 55.6 Billings in excess of costs and recognized earnings on uncompleted contracts (146.8) (52.2) $ (83.1) $ 3.4
Schedule of Other Invested Assets	Carrying values of other invested assets were as follows (in millions): June 30, 2021 December 31, 2020 Measurement Equity Total Measurement Equity Total Common stock $ — $ 2.5 $ 2.5 $ — $ 2.5 $ 2.5 Preferred stock — 12.1 12.1 — 15.4 15.4 Fixed maturities 0.5 — 0.5 0.5 — 0.5 Other 11.3 26.7 38.0 11.3 25.7 37.0 Total $ 11.8 $ 41.3 $ 53.1 $ 11.8 $ 43.6 $ 55.4
Schedule of Financial Instruments Measured at Fair Value on Nonrecurring Basis	The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis. The table excludes carrying amounts for cash and cash equivalents, accounts receivable, accounts payable and other current liabilities, and other assets and liabilities that approximate fair value due to relatively short periods to maturity (in millions): June 30, 2021 Fair Value Measurement Using: Carrying Value Estimated Fair Value Level 1 Level 2 Level 3 Assets Other invested assets $ 11.3 $ 11.3 $ — $ — $ 11.3 Total assets not accounted for at fair value $ 11.3 $ 11.3 $ — $ — $ 11.3 Liabilities Debt obligations (1) $ 676.3 $ 692.7 $ — $ 692.7 $ — Total liabilities not accounted for at fair value $ 676.3 $ 692.7 $ — $ 692.7 $ — December 31, 2020 Fair Value Measurement Using: Carrying Value Estimated Fair Value Level 1 Level 2 Level 3 Assets Other invested assets $ 11.3 $ 11.3 $ — $ — $ 11.3 Total assets not accounted for at fair value $ 11.3 $ 11.3 $ — $ — $ 11.3 Liabilities Debt obligations (1) $ 560.7 $ 579.2 $ — $ 579.2 $ — Total liabilities not accounted for at fair value $ 560.7 $ 579.2 $ — $ 579.2 $ — (1) Excludes certain lease obligations accounted for under ASC 842, Leases .
Schedule of Other Non-Current Assets	The following tables provide information relating to Other non-current assets (in millions): June 30, December 31, Right of use asset $ 72.2 $ 39.8 Other 4.5 2.4 Total other non-current assets $ 76.7 $ 42.2
Schedule of Accrued Liabilities	Accrued liabilities consist of the following (in millions): June 30, December 31, Accrued expenses and other current liabilities $ 42.2 $ 27.9 Accrued payroll and employee benefits 32.6 34.7 Accrued interest 26.7 13.9 Accrued income taxes 0.4 0.6 Total accrued liabilities $ 101.9 $ 77.1
Schedule of Other Noncurrent Liabilities	The following tables provide information relating to Other non-current liabilities (in millions): June 30, December 31, Lease liability, net of current portion $ 60.4 $ 31.6 Other 10.2 8.2 Total other non-current liabilities $ 70.6 $ 39.8

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Schedule of Lease ROUs and Lease Liabilities	As of June 30, 2021 and December 31, 2020, lease right-of-use assets and lease liabilities consist of the following (in millions): June 30, December 31, Right-of-use assets: Operating lease (Other non-current assets) $ 72.2 $ 39.8 Finance lease (Property, plant and equipment, net) 0.3 0.9 Total right-of-use assets $ 72.5 $ 40.7 Lease liabilities: Current portion of operating lease (Other current liabilities) $ 16.2 $ 11.2 Non-current portion of operating lease (Other non-current liabilities) 60.4 31.6 Finance lease (Debt obligations) 0.2 0.8 Total lease liabilities $ 76.8 $ 43.6
Schedule of Leases, Cost	The following table summarizes the components of lease expense for the three and six months ended June 30, 2021 and 2020 (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Finance lease cost: Amortization of right-of-use assets $ 0.3 $ 0.3 $ 0.6 $ 0.6 Interest on lease liabilities — — — 0.1 Net finance lease cost 0.3 0.3 0.6 0.7 Operating lease cost 4.3 3.5 7.8 7.2 Variable lease cost 0.1 0.1 0.2 0.2 Total lease cost $ 4.7 $ 3.9 $ 8.6 $ 8.1 Cash flow information related to leases for the three and six months ended June 30, 2021and 2020 is as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ — $ 0.1 $ — $ 0.1 Financing cash flows from finance leases $ 0.2 $ 0.3 $ 0.5 $ 0.5 Operating cash flows from operating leases $ 4.2 $ 3.6 $ 7.9 $ 7.1 Right-of-use assets obtained in exchange for new lease liabilities Finance leases $ — $ 0.1 $ — $ 0.1 Operating leases $ 37.3 $ 3.6 $ 41.2 $ 12.1 As of June 30, 2021 and December 31, 2020, the weighted-average remaining lease term and the weighted-average discount rate for finance leases and operating leases are as follows: June 30, December 31, Weighted-average remaining lease term (years) - operating lease 8.0 4.4 Weighted-average remaining lease term (years) - finance lease 1.0 0.9 Weighted-average discount rate - operating lease 5.2 % 6.2 % Weighted-average discount rate - finance lease 7.0 % 8.9 %
Schedule of Finance Lease, Liability, Maturity	As of June 30, 2021, undiscounted cash flows for finance and operating leases are as follows (in millions): Operating Finance 2021 $ 19.6 $ 0.2 2022 16.6 — 2023 12.4 — 2024 8.9 — 2025 6.4 — Thereafter 29.8 — Total future lease payments 93.7 0.2 Less: Present values (17.1) — Total lease liability balance $ 76.6 $ 0.2
Schedule of Operating Lease, Liability, Maturity	As of June 30, 2021, undiscounted cash flows for finance and operating leases are as follows (in millions): Operating Finance 2021 $ 19.6 $ 0.2 2022 16.6 — 2023 12.4 — 2024 8.9 — 2025 6.4 — Thereafter 29.8 — Total future lease payments 93.7 0.2 Less: Present values (17.1) — Total lease liability balance $ 76.6 $ 0.2

Share-based Compensation (Table

Share-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Summary of Company's Restricted Stock Activity	A summary of HC2’s restricted stock activity is as follows: Shares Weighted Average Grant Date Fair Value Unvested - December 31, 2019 2,213,775 $ 5.12 Granted 1,152,202 $ 2.74 Vested (2,258,905) $ 4.08 Forfeited (478,639) $ 5.87 Unvested - December 31, 2020 628,433 $ 3.93 Granted 593,458 $ 3.81 Vested (425,222) $ 3.74 Forfeited (31,171) $ 2.62 Unvested - June 30, 2021 765,498 $ 4.00
Summary of Company's Stock Option Activity	A summary of HC2’s stock option activity is as follows: Shares Weighted Average Exercise Price Outstanding - December 31, 2019 7,067,592 $ 6.52 Granted 143,096 $ 2.62 Exercised — $ — Forfeited (142,503) $ 5.45 Expired (2,328,327) $ 9.18 Outstanding - December 31, 2020 4,739,858 $ 5.13 Granted — $ — Exercised — $ — Forfeited — $ — Expired (21,599) $ 5.45 Outstanding - June 30, 2021 4,718,259 $ 5.13 Eligible for exercise 4,716,909 $ 5.13

Equity (Tables)

Equity (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Schedule of Stock by Class	The Company’s preferred shares authorized, issued and outstanding consisted of the following: June 30, December 31, Preferred shares authorized, $0.001 par value 20,000,000 20,000,000 Series A shares issued and outstanding (1) — 6,375 Series A-2 shares issued and outstanding (1) — 4,000 (1) CGI, a wholly owned subsidiary of the Company, owns 6,125 shares of Series A Preferred Stock and 10,000 shares of Series A-2 Preferred Stock which are eliminated in consolidation.
Summary of Cash, PIK and Special Cash Dividends	During the six months ended June 30, 2021 and 2020, HC2's Board of Directors declared cash dividends with respect to HC2’s issued and outstanding Preferred Stock, excluding Preferred Stock owned by CGI which is eliminated in consolidation, as presented in the following table (in millions): 2021 Declaration Date March 31, 2021 May 29, 2021 Holders of Record Date March 31, 2021 May 29, 2021 Payment Date April 15, 2021 June 4, 2021 Total Dividend $ 0.2 $ 0.1 2020 Declaration Date March 31, 2020 June 30, 2020 Holders of Record Date March 31, 2020 June 30, 2020 Payment Date April 15, 2020 July 15, 2020 Total Dividend $ 0.2 $ 0.2

Operating Segment and Related_2

Operating Segment and Related Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Summary of Company's Operating Segments	Summary information with respect to the Company’s operating segments is as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenue Infrastructure $ 232.0 $ 172.3 $ 393.3 $ 348.8 Life Sciences 1.2 — 1.2 — Spectrum 10.6 9.5 21.1 19.6 Total revenue $ 243.8 $ 181.8 $ 415.6 $ 368.4 Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Income (loss) from operations Infrastructure $ 2.2 $ 4.5 $ 4.4 $ 7.1 Life Sciences (4.5) (3.5) (9.3) (6.7) Spectrum 1.4 (1.2) 0.2 (4.1) Other (0.2) (0.7) (0.6) (1.7) Non-operating Corporate (6.6) (8.0) (13.3) (17.1) Total loss from operations $ (7.7) $ (8.9) $ (18.6) $ (22.5) A reconciliation of the Company's consolidated segment operating income to consolidated earnings before income taxes is as follows (in millions): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Loss from operations $ (7.7) $ (8.9) $ (18.6) $ (22.5) Interest expense (12.4) (19.1) (33.8) (38.3) Loss on early extinguishment or restructuring of debt (1.6) (3.4) (12.4) (9.2) Income (loss) from equity investees 0.2 (0.2) (1.9) (2.7) Other income 0.4 64.6 3.8 66.1 (Loss) income from continuing operations before income taxes (21.1) 33.0 (62.9) (6.6) Income tax expense (2.6) (12.0) (3.7) (2.3) (Loss) income from continuing operations (23.7) 21.0 (66.6) (8.9) (Loss) income from discontinued operations (including gain on disposal of $40.4 million and loss on disposal of $39.3 million for the six months ended June 30, 2021 and 2020, respectively) (1.5) 7.5 50.4 (63.6) Net (loss) income (25.2) 28.5 (16.2) (72.5) Net income (loss) attributable to noncontrolling interest and redeemable noncontrolling interest 1.7 (15.4) 5.3 2.5 Net (loss) income attributable to HC2 Holdings, Inc. (23.5) 13.1 (10.9) (70.0) Less: Preferred dividends and deemed dividends from conversions 0.2 0.4 0.6 0.8 Net (loss) income attributable to common stock and participating preferred stockholders $ (23.7) $ 12.7 $ (11.5) $ (70.8) Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Depreciation and Amortization Infrastructure $ 3.3 $ 2.7 $ 5.7 $ 5.3 Life Sciences 0.1 0.1 0.1 0.1 Spectrum 1.4 1.7 2.9 3.4 Total 4.8 4.5 8.7 8.8 Depreciation expense recognized within cost of revenue 2.8 2.3 5.0 4.6 Total depreciation and amortization $ 7.6 $ 6.8 $ 13.7 $ 13.4 Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Capital Expenditures (*) Infrastructure $ 3.9 $ 1.1 $ 5.5 $ 3.4 Life Sciences 0.3 0.1 0.5 0.1 Spectrum 0.6 3.7 2.0 6.4 Non-operating Corporate — 0.1 — 0.1 Total $ 4.8 $ 5.0 $ 8.0 $ 10.0 (*) The above capital expenditures exclude assets acquired under terms of capital lease and vendor financing obligations.
Segment Reporting for Long-term investments, Property and Equipment - Net and Assets	June 30, December 31, Investments Infrastructure $ 0.9 $ 0.9 Life Sciences 15.1 18.4 Other 37.1 36.1 Total $ 53.1 $ 55.4 June 30, December 31, Total Assets Infrastructure $ 858.9 $ 494.8 Life Sciences 20.4 21.4 Spectrum 206.0 213.6 Insurance 5,849.0 5,854.0 Other 40.8 167.3 Non-operating Corporate 4.2 30.1 Eliminations (43.4) (38.4) Total $ 6,935.9 $ 6,742.8

Basic and Diluted Income (Los_2

Basic and Diluted Income (Loss) Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Calculation of Basic Income (Loss) Per Common Share to Diluted Income (Loss) Per Common Share	The following table presents a reconciliation of net income (loss) used in basic and diluted EPS calculations (in millions, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (Loss) income from continuing operations $ (23.7) $ 21.0 $ (66.6) $ (8.9) Income (loss) attributable to noncontrolling interest and redeemable noncontrolling interest 1.6 (15.3) 4.4 (12.5) (Loss) income from continuing operations attributable to the Company (22.1) 5.7 (62.2) (21.4) Less: Preferred dividends, deemed dividends and repurchase gains 0.2 0.4 0.6 0.8 (Loss) income from continuing operations attributable to HC2 common stockholders (22.3) 5.3 (62.8) (22.2) (Loss) income from discontinued operations (1.5) 7.5 50.4 (63.6) (Loss) income attributable to noncontrolling interest and redeemable noncontrolling interest 0.1 (0.1) 0.9 15.0 (Loss) income from discontinued operations, net of tax and noncontrolling interest (1.4) 7.4 51.3 (48.6) Net (loss) income attributable to common stock and participating preferred stockholders $ (23.7) $ 12.7 $ (11.5) $ (70.8) Earnings allocable to common shares: Participating shares at end of period: Weighted-average common stock outstanding 77.0 46.8 77.1 45.9 Unvested restricted stock 0.3 Preferred stock (as-converted basis) 2.1 Total 77.0 49.2 77.1 45.9 Percentage of loss allocated to: Common stock 100.0 % 95.1 % 100.0 % 100.0 % Unvested restricted stock — % 0.6 % — % — % Preferred stock — % 4.3 % — % — % Numerator for earnings per share, basic: Net (loss) income from continuing operations attributable to common stock, basic $ (22.3) $ 5.0 $ (62.8) $ (22.2) Net (loss) income from discontinued operations attributable to common stock, basic $ (1.4) $ 7.1 $ 51.3 $ (48.6) Net (loss) income attributable to common stock, basic $ (23.7) $ 12.1 $ (11.5) $ (70.8) Earnings allocable to common shares, diluted: Numerator for earnings per share, diluted Effect of assumed shares under the if-converted method for convertible instruments $ — $ — $ — $ — Net (loss) income from continuing operations attributable to common stock, basic $ (22.3) $ 5.0 $ (62.8) $ (22.2) Net (loss) income from discontinued operations attributable to common stock, basic $ (1.4) $ 7.1 $ 51.3 $ (48.6) Net (loss) income attributable to common stock, basic $ (23.7) $ 12.1 $ (11.5) $ (70.8) Denominator for basic and dilutive earnings per share Weighted average common shares outstanding - basic 77.0 46.8 77.1 45.9 Effect of assumed shares under treasury stock method for stock options and restricted shares and if-converted method for convertible instruments — 2.0 — — Weighted average common shares outstanding - diluted 77.0 48.8 77.1 45.9 (Loss) income per share - continuing operations Basic $ (0.29) $ 0.11 $ (0.82) $ (0.48) Diluted $ (0.29) $ 0.11 $ (0.82) $ (0.48) (Loss) income per share - discontinued operations Basic $ (0.02) $ 0.15 $ 0.67 $ (1.06) Diluted $ (0.02) $ 0.14 $ 0.67 $ (1.06) (Loss) income per share - Net (loss) income attributable to common stock and participating preferred stockholders Basic $ (0.31) $ 0.26 $ (0.15) $ (1.54) Diluted $ (0.31) $ 0.25 $ (0.15) $ (1.54)

Organization and Business (Deta

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%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Cash and cash equivalents	$ 18.1	$ 23.7	$ 43.8	$ 23.3
Restricted cash included in other assets	2.6	1.4	1.5	1.4
Total cash and cash equivalents and restricted cash	20.7	25.1	45.3	24.7
Cash and cash equivalents		180.3		216
Restricted cash classified in Assets held for sale	0	0.2	0.2	0.2
Total cash and cash equivalents and restricted cash classified in Assets held for sale	253.7	180.5	$ 195.4	$ 216.2
Supplemental cash flow information:
Cash paid for interest	12.3	33
Cash paid for taxes, net of refunds	2.6	8
Non-cash investing and financing activities:
Property, plant and equipment included in accounts payable	2.1	4.9
Investments included in accounts receivable	0	20
Investments included in accounts payable	0	8.5
Extinguishment of convertible note in exchange	51.8	0
Issuance of convertible note in exchange	(51.8)	0
Debt assumed in acquisitions	$ 6.3	$ 0

Discontinued Operations - Summa

Discontinued Operations - Summarized Operating Results of the Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale and liquidation of subsidiaries			$ 40.4	$ (39.3)
(Loss) income from discontinued operations	$ (1.5)	$ 7.5	50.4	(63.6)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	117.5	1.7	331.6
Life, accident and health earned premiums, net	27.3	29.5	55.7	58.2
Net investment income	48.5	48.4	92.4	100.3
Realized/unrealized (losses) gains on investments	(4.4)	(0.5)	5.1	(19.5)
Total revenue	71.4	194.9	154.9	470.6
Cost of revenue	0	110.1	0.8	317.5
Policy benefits, changes in reserves, and commissions	69.9	63	126	135.4
Selling, general and administrative	8.7	11.8	21.1	39
Depreciation and amortization	(5.1)	(3.3)	(11)	(3.3)
(Loss) income from operations	(2.1)	13.3	18	(18)
Interest expense	(0.1)	(2.3)	(0.5)	(8)
Gain (loss) on sale and liquidation of subsidiaries	0	0		(39.3)
Income from equity investees	0	0	0	0.5
Other (loss) income	0	(0.2)	(3.1)	1.7
Pre-tax income (loss) from discontinued operations	(2.2)	10.8	54.8	(63.1)
Income tax benefit (expense)	0.7	(3.3)	(4.4)	(0.5)
(Loss) income from discontinued operations	$ (1.5)	$ 7.5	$ 50.4	$ (63.6)

Discontinued Operations - Narra

Discontinued Operations - Narrative (Details) - USD ($) $ in Millions

Mar. 29, 2021

Jan. 15, 2021

Oct. 31, 2020

Feb. 28, 2020

Jun. 30, 2021

Mar. 31, 2021

Dec. 31, 2020

Jun. 30, 2020

Mar. 31, 2020

Jun. 30, 2021

Jun. 30, 2020

Jan. 30, 2020

Oct. 30, 2019

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Gain (loss) on sale of subsidiary

$ 40.4

$ (39.3)

Loss on disposal of subsidiary

$ 0

$ 0.7

0

(22.1)

Repayments of long-term debt

446.1

154.2

Foreign currency translation adjustment

0.4

(3.8)

1.2

(4)

Spectrum

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Station license

5.2

$ 5.2

Discontinued Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Gain (loss) on sale of subsidiary

$ 0

0

$ (39.3)

CGI

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Beneficial ownership interest

6.60%

Transaction value

$ 90

Transaction cost including in cash and certain assets at CGI

$ 65

CGI | Discontinued Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Beneficial ownership interest

6.60%

6.60%

Transaction value

$ 90

$ 90

Transaction cost including in cash and certain assets at CGI

$ 65

Marine Services

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Transaction value

$ 250

$ 140

Transaction cost including in cash and certain assets at CGI

$ 144

$ 85.5

Gain (loss) on sale of subsidiary

$ 1.2

$ 2.4

$ (39.3)

Loss on disposal of subsidiary

$ 31.3

Marine Services | Discontinued Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Gain (loss) on sale of subsidiary

(39.3)

$ 1.2

$ 2.4

Loss on disposal of subsidiary

31.3

Marine Services | Revolving Credit Agreement

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Repayments of long-term debt

15

Marine Services | Revolving Credit Agreement | Discontinued Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Repayments of long-term debt

15

Marine Services | 11.5% Senior Secured Notes

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Debt instrument, amount redeemed

$ 76.9

Interest rate

11.50%

Marine Services | Secured Indenture

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Debt instrument, amount redeemed

$ 76.9

ICS | Discontinued Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Gain (loss) on sale of subsidiary

$ 0.9

Foreign currency translation adjustment

$ 8.2

Beyond6

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Transaction value

$ 106.5

Transaction cost including in cash and certain assets at CGI

70

Gain (loss) on sale of subsidiary

39.2

Beyond6 | Discontinued Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Gain (loss) on sale of subsidiary

39.2

Beyond6 | 11.5% Senior Secured Notes

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Repayments of long-term debt

27.9

Beyond6 | 2020 Revolving Credit Agreement

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Repayments of long-term debt

$ 15

Discontinued Operations - Inter

Discontinued Operations - Interest and Amortization (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense	$ 12.4	$ 19.1	$ 33.8	$ 38.3
Revolving Credit Agreement | Marine Services | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense	0	0	0	0.2
Amortization of deferred financing costs and original issuance discount	0	0	0	0.1
Secured Indenture | Marine Services | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense	0	0	0	2.2
Amortization of deferred financing costs and original issuance discount	0	0	0	0.2
2020 Revolving Credit Agreement | Beyond6 | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense	0	0.2	0.1	0.2
11.5% Senior Secured Notes | Beyond6 | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense	0	0.8	0.3	1.6
Amortization of deferred financing costs and original issuance discount	$ 0	$ 0.1	$ 0	$ 0.2

Discontinued Operations - Sum_2

Discontinued Operations - Summarized Assets and Liabilities of the of Discontinued Operations (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents			$ 180.3	$ 216
Total assets held for sale	$ 5,812.4	$ 5,942.1
Current liabilities
Total liabilities held for sale	5,261.6	5,306.7
Discontinued Operations
Current assets
Cash and cash equivalents	253.7	195.2
Accounts receivable, net	0	13.6
Other current assets	6.7	8.7
Total current assets	260.4	217.5
Investments	4,483.7	4,610.2
Recoverable from reinsurers	1,015.2	957.5
Deferred tax asset	0	1.4
Property, plant and equipment, net	1.4	90.5
Goodwill	0	2.1
Intangibles, net	2.5	11.7
Other assets	44	51.2
Total assets held for sale	5,807.2	5,942.1
Current liabilities
Accounts payable	0	2.6
Accrued liabilities	8.8	35.8
Current portion of debt obligations	0	5.7
Other current liabilities	3.6	7.4
Total current liabilities	12.4	51.5
Life, accident and health reserves	4,711.7	4,627.5
Annuity reserves	225.8	228.8
Value of business acquired	188.3	199.8
Deferred tax liability	114.8	136.5
Debt obligations	0	50.6
Other liabilities	8.6	12
Total liabilities held for sale	$ 5,261.6	$ 5,306.7

Revenue - Reconciliation of Rev

Revenue - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 243.8	$ 181.8	$ 415.6	$ 368.4
Infrastructure
Segment Reporting Information [Line Items]
Revenue	232	171.7	393.3	348.2
Operating Segments | Infrastructure
Segment Reporting Information [Line Items]
Revenue	232	172.3	393.3	348.8
Operating Segments | Spectrum
Segment Reporting Information [Line Items]
Revenue	10.6	9.5	21.1	19.6
Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenue	$ 1.2	$ 0	$ 1.2	$ 0

Revenue - Schedule of Accounts

Revenue - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total accounts receivables with customers	$ 352.3	$ 175.8
Infrastructure
Segment Reporting Information [Line Items]
Total accounts receivables with customers	343.7	168.5
Spectrum
Segment Reporting Information [Line Items]
Total accounts receivables with customers	8.5	7.3
Life Sciences
Segment Reporting Information [Line Items]
Total accounts receivables with customers	$ 0.1	$ 0

Revenue - Construction Segment

Revenue - Construction Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 243.8	$ 181.8	$ 415.6	$ 368.4
Total revenue	243.8	181.8	415.6	368.4
Infrastructure
Disaggregation of Revenue [Line Items]
Revenue	232	171.7	393.3	348.2
Other revenue	0	0.6	0	0.6
Total revenue	232	172.3	393.3	348.8
Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue	84.8	54	134.3	116.8
Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue	79	59.6	119.2	118.4
Infrastructure | Transportation
Disaggregation of Revenue [Line Items]
Revenue	10.8	23.5	24.7	39.9
Infrastructure | Government
Disaggregation of Revenue [Line Items]
Revenue	17.2	11.1	38.5	19.7
Infrastructure | Leisure
Disaggregation of Revenue [Line Items]
Revenue	4.7	11.3	12.2	27.3
Infrastructure | Healthcare
Disaggregation of Revenue [Line Items]
Revenue	11.1	4.7	20	12.6
Infrastructure | Convention
Disaggregation of Revenue [Line Items]
Revenue	18.8	1.4	28.2	3.8
Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 5.6	$ 6.1	$ 16.2	$ 9.7

Revenue - Construction Segmen_2

Revenue - Construction Segment Contract with Customer, Asset and Liability (Details) - Infrastructure - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Costs and recognized earnings in excess of billings on uncompleted contracts	$ 63.7	$ 55.6
Billings in excess of costs and recognized earnings on uncompleted contracts	$ (146.8)	$ (52.2)

Revenue - Narrative (Details)

Revenue - Narrative (Details) - Infrastructure $ in Millions	Jun. 30, 2021USD ($)
Revenue from External Customer [Line Items]
Change in contract assets costs in excess of billings, new commercial contracts	$ 35.6
Change in contract assets costs in excess of billings, transfer to receivables	29.4
Change in contract liabilities costs in excess of billings, new commercial contracts	114.4
Change in contract liabilities costs in excess of billings, transfer to receivables	74.8
Remaining commitment obligations, amount	10
Banker Steel Acquisition
Revenue from External Customer [Line Items]
Change in contract assets costs in excess of billings, new commercial contracts	1.9
Change in contract liabilities costs in excess of billings, new commercial contracts	$ 55

Revenue - Schedule of Construct

Revenue - Schedule of Construction Segment Revenue (Details) - Infrastructure $ in Millions	Jun. 30, 2021USD ($)
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 1,624.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 987
Remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 637.4
Remaining performance obligation period	5 years
Commercial
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 1,200.7
Commercial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 580.5
Remaining performance obligation period	1 year
Commercial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 620.2
Remaining performance obligation period	5 years
Industrial
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 201.3
Industrial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 201.3
Remaining performance obligation period	1 year
Industrial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0
Remaining performance obligation period	5 years
Transportation
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 58.7
Transportation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 41.5
Remaining performance obligation period	1 year
Transportation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 17.2
Remaining performance obligation period	5 years
Government
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 47.3
Government | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 47.3
Remaining performance obligation period	1 year
Government | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0
Remaining performance obligation period	5 years
Leisure
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 7
Leisure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 7
Remaining performance obligation period	1 year
Leisure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0
Remaining performance obligation period	5 years
Healthcare
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 51.1
Healthcare | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 51.1
Remaining performance obligation period	1 year
Healthcare | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0
Remaining performance obligation period	5 years
Convention
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 52.7
Convention | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 52.7
Remaining performance obligation period	1 year
Convention | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0
Remaining performance obligation period	5 years
Other
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 5.6
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 5.6
Remaining performance obligation period	1 year
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0
Remaining performance obligation period	5 years

Revenue - Life Sciences Segment

Revenue - Life Sciences Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 243.8	$ 181.8	$ 415.6	$ 368.4
Total revenue	243.8	181.8	415.6	368.4
Life Sciences
Segment Reporting Information [Line Items]
Total revenue	1.2	0	1.2	0
Systems revenue | Life Sciences
Segment Reporting Information [Line Items]
Revenue	$ 1.2	$ 0	$ 1.2	$ 0

Revenue - Spectrum Segment Disa

Revenue - Spectrum Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 243.8	$ 181.8	$ 415.6	$ 368.4
Total revenue	243.8	181.8	415.6	368.4
Spectrum
Segment Reporting Information [Line Items]
Total revenue	10.6	9.5	21.1	19.6
Network advertising | Spectrum
Segment Reporting Information [Line Items]
Revenue	4.8	4	9.5	9
Broadcast station | Spectrum
Segment Reporting Information [Line Items]
Revenue	4.5	3.8	8.9	7.3
Network distribution | Spectrum
Segment Reporting Information [Line Items]
Revenue	0.7	1	1.6	2.1
Other | Spectrum
Segment Reporting Information [Line Items]
Revenue	$ 0.6	$ 0.7	$ 1.1	$ 1.2

Revenue - Remaining Unsatisfied

Revenue - Remaining Unsatisfied Performance Obligations (Details) - Spectrum $ in Millions	Jun. 30, 2021USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 5.6
Remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 3.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Revenue, Remaining Performance Obligation, Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	5 years
Network advertising | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 1.7
Network advertising | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	1 year
Network advertising | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Revenue, Remaining Performance Obligation, Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	5 years
Broadcast station | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 6.9
Broadcast station | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	1 year
Broadcast station | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Revenue, Remaining Performance Obligation, Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	5 years
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 0.1
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	1 year
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Revenue, Remaining Performance Obligation, Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	5 years

Acquisitions, Dispositions, a_2

Acquisitions, Dispositions, and Deconsolidations - Infrastructure Segment (Details)	May 27, 2021USD ($)company	Jun. 30, 2021segment
Business Acquisition [Line Items]
Number of reportable operating segments | segment		4
Customer relationships and contracts
Business Acquisition [Line Items]
Weighted-Average Original Useful Life		11 years
Banker Steel Acquisition
Business Acquisition [Line Items]
Percentage of business acquired	100.00%
Gross consideration	$ 145,000,000
Long-term debt, less current portion	6,300,000
Cash acquired from acquisition	$ 25,000,000
Number of reportable operating segments | company	6
Intangibles, net	$ 58,500,000
Goodwill, expected tax deductible amount	0
Banker Steel Acquisition | Trade names
Business Acquisition [Line Items]
Indefinite-lived intangible assets	$ 7,400,000
Indefinite-lived intangible assets, Useful Life	15 years
Banker Steel Acquisition | Customer relationships and contracts
Business Acquisition [Line Items]
Finite-lived intangibles	$ 34,000,000
Weighted-Average Original Useful Life	18 years
Banker Steel Acquisition | Customer Contracts
Business Acquisition [Line Items]
Finite-lived intangibles	$ 15,100,000
Weighted-Average Original Useful Life	2 years
Banker Steel Acquisition | Leasehold Interests
Business Acquisition [Line Items]
Finite-lived intangibles	$ 2,000,000
Banker Steel Acquisition | Sellers' Notes
Business Acquisition [Line Items]
Face amount	49,600,000
Banker Steel Acquisition | Term Loan
Business Acquisition [Line Items]
Face amount	110,000,000
Banker Steel Acquisition | Revolving Credit Facility
Business Acquisition [Line Items]
Face amount	64,100,000
DBMG
Business Acquisition [Line Items]
Acquisition related costs	$ 1,500,000

Acquisitions, Dispositions, a_3

Acquisitions, Dispositions, and Deconsolidations - Schedule of Purchase Price Allocations, Construction Segment (Details) - USD ($)	May 27, 2021	Jun. 30, 2021	Dec. 31, 2020
Purchase Consideration at Fair Value
Goodwill		$ 121,100,000	$ 111,000,000
Banker Steel Acquisition
Purchase Consideration at Fair Value
Bankers Steel debt - assumed	$ 6,300,000
Cash	25,000,000
Gross consideration	145,000,000
Less: Transaction costs	400,000
Less: Bankers debt - assumed	6,300,000
Less: R&W premium paid by seller	500,000
Net consideration	137,800,000
Cash and cash equivalents	9,300,000
Accounts receivable, net	111,300,000
Costs recognized in earnings in excess of billings on uncompleted contracts	1,900,000
Assets held for sale	700,000
Other current assets	7,300,000
Property, plant, and equipment, net	62,600,000
Other assets	40,200,000
Intangibles, net	58,500,000
Goodwill	10,300,000
Total assets to be acquired	302,100,000
Accounts Payable	39,100,000
Billings in excess of costs and recognized earnings on uncompleted contracts	55,000,000
Other current liabilities	29,600,000
Other liabilities	34,200,000
Long-term debt, less current portion	6,400,000
Total liabilities to be assumed	164,300,000
Total net assets acquired	137,800,000
Banker Steel Acquisition | Sellers' Notes
Purchase Consideration at Fair Value
Face amount	49,600,000
Banker Steel Acquisition | Revolving Credit Facility
Purchase Consideration at Fair Value
Face amount	64,100,000
Banker Steel Acquisition | Term Loan
Purchase Consideration at Fair Value
Face amount	$ 110,000,000

Acquisitions, Dispositions, a_4

Acquisitions, Dispositions, and Deconsolidations - Business Acquisition, Pro Forma Information (Details) - Banker Steel Acquisition - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Revenue	$ 39.5		$ 39.5
Net income from operations	1.3		1.3
Net income attributable to HC2 Holdings	0.6		0.6
Revenue	326.1	$ 252.5	613.1	$ 517
Income (loss) from operations	1.5	(7.3)	(7.1)	(16.7)
Net income (loss) attributable to HC2 Holdings	$ (15.7)	$ 10.5	$ (2.6)	$ (70.3)

Acquisitions, Dispositions, a_5

Acquisitions, Dispositions, and Deconsolidations - Spectrum Segment, Insurance Segment and Other Segments (Details) - USD ($) $ in Thousands	Mar. 29, 2021	Jan. 15, 2021	Feb. 28, 2020	Jan. 30, 2020	Oct. 30, 2019	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	May 12, 2020
Business Acquisition [Line Items]
Cash received from dispositions, net of cash disposed											$ 71,200	$ 144,000
Gain (loss) on sale of subsidiary											40,400	(39,300)
Loss on disposal of subsidiary						$ 0			$ 700		0	(22,100)
Foreign currency translation adjustment						$ 400			(3,800)		1,200	$ (4,000)
CGI
Business Acquisition [Line Items]
Beneficial ownership interest	6.60%
Consideration to be received	$ 90,000
Proceeds from divestiture of businesses	$ 65,000
Marine Services
Business Acquisition [Line Items]
Consideration to be received				$ 250,000	$ 140,000
Proceeds from divestiture of businesses			$ 144,000						85,500
Ownership percentage before sale of stock				100.00%
Potential earn-out, maximum				$ 12,500
Cash received from dispositions, net of cash disposed			100,800
Consideration held in escrow for future losses payable				1,250
Consideration held of escrow for purchase price adjustment				1,910
Consideration paid on the earlier of December 31, 2020 or the date on which a cash collateralized bond in connection with Company's bonding facility is released				$ 2,400
Gain (loss) on sale of subsidiary							$ 1,200	$ 2,400		$ (39,300)
Loss on disposal of subsidiary										$ 31,300
Realized gain (loss) on disposal											71,100
Tax expense (benefit)											7,200
Marine Services | Put Option
Business Acquisition [Line Items]
Realized gain (loss) on disposal											$ 11,300
Marine Services | Non- controlling Interest
Business Acquisition [Line Items]
Proceeds from divestiture of businesses									17,500
Cash divested from deconsolidation			36,800
Marine Services | Noncontrolling Interest Redeemable
Business Acquisition [Line Items]
Proceeds from divestiture of businesses									$ 2,100
Cash divested from deconsolidation			$ 5,500
Huawei Marine Networks
Business Acquisition [Line Items]
Consideration to be received					$ 285,000
Beyond6
Business Acquisition [Line Items]
Consideration to be received		$ 106,500
Proceeds from divestiture of businesses		70,000
Gain (loss) on sale of subsidiary		$ 39,200
DTV America
Business Acquisition [Line Items]
Parents interest, controlling						76.00%	60.00%				76.00%
New Saxon 2019 Limited
Business Acquisition [Line Items]
Parents interest, controlling				73.00%									19.00%
Marine Services
Business Acquisition [Line Items]
Parents interest, controlling					49.00%	73.00%					73.00%		30.00%
Huawei Marine Networks
Business Acquisition [Line Items]
Ownership percentage before sale of stock					49.00%

Accounts Receivable, net (Detai

Accounts Receivable, net (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Contracts in progress	$ 250.5	$ 118.6
Unbilled retentions	93.8	50.3
Trade receivables	8.6	7.5
Other receivables	12.2	8.9
Allowance for doubtful accounts	(0.5)	(0.6)
Total	$ 364.6	$ 184.7

Property, Plant, and Equipmen_3

Property, Plant, and Equipment, net - Summary of Property, Plant, and Equipment, net (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 256.1	$ 186.3
Less: Accumulated depreciation	82.8	73.5
Property, plant and equipment, net	173.3	112.8
Equipment, furniture and fixtures, and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	170.4	113.7
Building and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43.4	41
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24.1	24.1
Plant and transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10.6	4.4
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7.6	$ 3.1

Property, Plant, and Equipmen_4

Property, Plant, and Equipment, net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 5.3	$ 5.2	$ 10	$ 10.3
Depreciation expense with cost of revenue	$ 2.8	$ 2.3	$ 5	$ 4.6

Goodwill and Intangibles, net -

Goodwill and Intangibles, net - Changes in the Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 111
Acquisitions	10.3
Translation	(0.2)
Ending balance	121.1
Infrastructure
Goodwill [Roll Forward]
Beginning balance	89.6
Acquisitions	10.3
Translation	(0.2)
Ending balance	99.7
Spectrum
Goodwill [Roll Forward]
Beginning balance	21.4
Acquisitions	0
Translation	0
Ending balance	$ 21.4

Goodwill and Intangibles, net_2

Goodwill and Intangibles, net - Indefinite-lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 107.5	$ 113
FCC licenses
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	107.5	113
Other
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 0	$ 0

Goodwill and Intangibles, net_3

Goodwill and Intangibles, net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 2.3	$ 1.5	$ 3.8	$ 3
FCC licenses
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, period decrease			$ 5.5

Goodwill and Intangibles, net_4

Goodwill and Intangibles, net - Definite Lived Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 139.3	$ 80.1
Negative amortization	(24.8)	(21)
Net	$ 114.5	59.1
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	14 years
Gross Carrying Amount	$ 25.4	18
Negative amortization	(5.4)	(4.6)
Net	$ 20	13.4
Customer relationships and contracts
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	11 years
Gross Carrying Amount	$ 85.4	36.4
Negative amortization	(14.5)	(12.1)
Net	$ 70.9	24.3
Channel sharing arrangements
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	35 years
Gross Carrying Amount	$ 20.1	20.2
Negative amortization	(1.9)	(1.6)
Net	$ 18.2	18.6
Other
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	8 years
Gross Carrying Amount	$ 8.4	5.5
Negative amortization	(3)	(2.7)
Net	$ 5.4	$ 2.8

Goodwill and Intangibles, net_5

Goodwill and Intangibles, net - Estimated Amortization Expense (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
2021	$ 7.8
2022	15.6
2023	11.1
2024	8
2025	7.3
Thereafter	64.7
Net	$ 114.5	$ 59.1

Debt Obligations - Schedule of

Debt Obligations - Schedule of Debt (Details) - USD ($) $ in Millions	Feb. 23, 2021	Jun. 30, 2021	Feb. 01, 2021	Dec. 31, 2020	Jun. 30, 2020
Debt Instrument [Line Items]
Obligations under finance leases		$ 0.2		$ 0.8
Total aggregate finance lease and debt payments		679.6			$ 576.6
Unamortized issuance discount, issuance premium, and deferred financing costs		(3.1)			(15.1)
Less: current portion of debt obligations		(70.2)		(433.6)	(433.6)
Debt obligations		606.3		$ 127.9	127.9
8.50% Senior Secured Notes, due 2026
Debt Instrument [Line Items]
Interest rate			100.00%
7.50% Convertible Senior Notes, due 2026
Debt Instrument [Line Items]
Interest rate			100.00%
Infrastructure
Debt Instrument [Line Items]
Obligations under finance leases		$ 0.1			0.2
Infrastructure | 4.00% Note due 2024
Debt Instrument [Line Items]
Interest rate		4.00%
Infrastructure | 8.00% Note due 2024
Debt Instrument [Line Items]
Interest rate		8.00%
Infrastructure | LIBOR | LIBOR plus 5.85% Note, due 2023 | DBM Global Credit Facilities
Debt Instrument [Line Items]
Basis spread on variable rate		5.85%
Infrastructure | LIBOR | LIBOR plus 5.85% Note, due 2023 | Real Estate Term Advance
Debt Instrument [Line Items]
Outstanding debt		$ 0			71.6
Infrastructure | LIBOR | LIBOR plus 1.50% Line of Credit | Real Estate Term Advance
Debt Instrument [Line Items]
Outstanding debt		$ 0			38.7
Infrastructure | LIBOR | LIBOR plus 1.50% Line of Credit | Real Estate Term Advance | DBM Global Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Infrastructure | LIBOR | LIBOR plus 3.25% Note, due 2026 | Real Estate Term Advance
Debt Instrument [Line Items]
Outstanding debt		$ 109.6			0
Infrastructure | LIBOR | LIBOR plus 3.25% Note, due 2026 | Real Estate Term Advance | DBM Global Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate		3.25%
Infrastructure | LIBOR | LIBOR plus 2.15% Line of Credit | Real Estate Term Advance
Debt Instrument [Line Items]
Outstanding debt		$ 71.1			0
Infrastructure | LIBOR | LIBOR plus 2.15% Line of Credit | Real Estate Term Advance | DBM Global Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate		2.15%
Infrastructure | LIBOR | 4.00% Note due 2024 | Real Estate Term Advance
Debt Instrument [Line Items]
Outstanding debt		$ 27.5			0
Infrastructure | LIBOR | 8.00% Note due 2024 | Real Estate Term Advance
Debt Instrument [Line Items]
Outstanding debt		19.6			0
Infrastructure | LIBOR | Other, various maturity dates | Real Estate Term Advance
Debt Instrument [Line Items]
Outstanding debt		6.5			0
Spectrum
Debt Instrument [Line Items]
Obligations under finance leases		0.1			0.6
Spectrum | 8.50% Note due 2021
Debt Instrument [Line Items]
Outstanding debt		$ 19.3			19.3
Interest rate		8.50%
Spectrum | 10.50% Note due 2021
Debt Instrument [Line Items]
Outstanding debt		$ 32.9			32.9
Interest rate		10.50%
Spectrum | Other, various maturity dates
Debt Instrument [Line Items]
Outstanding debt		$ 2.9			2.9
Non-Operating Corporate | 11.50% Senior Secured Notes, due 2021
Debt Instrument [Line Items]
Outstanding debt		$ 0			340.4
Interest rate		11.50%
Non-Operating Corporate | 8.50% Senior Secured Notes, due 2026
Debt Instrument [Line Items]
Outstanding debt		$ 330			0
Interest rate		8.50%	8.50%
Non-Operating Corporate | 7.50% Convertible Senior Notes, due 2022
Debt Instrument [Line Items]
Outstanding debt		$ 3.2			55
Interest rate		7.50%	7.50%
Non-Operating Corporate | 7.50% Convertible Senior Notes, due 2026
Debt Instrument [Line Items]
Outstanding debt		$ 51.8			0
Interest rate		7.50%
Non-Operating Corporate | LIBOR plus 5.75% Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate	6.75%	5.75%
Outstanding debt		$ 5			$ 15
Non-Operating Corporate | LIBOR plus 5.75% Line of Credit | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	5.75%
Non-Operating Corporate | LIBOR plus 5.75% Line of Credit | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	6.75%

Debt Obligations - Schedule o_2

Debt Obligations - Schedule of Aggregate Debt Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Finance Leases
2021	$ 0.2
2022	0
2023	0
2024	0
2025	0
Thereafter	0
Total minimum principal and interest payments	0.2
Less: Amount representing interest	0
Total lease liability balance	0.2	$ 0.8
Debt
2021	71.5
2022	57.6
2023	57.1
2024	142.2
2025	40.2
Thereafter	507.5
Total minimum principal and interest payments	876.1
Less: Amount representing interest	(196.7)
Total aggregate finance lease and debt payments	679.4
Total
2021	71.7
2022	57.6
2023	57.1
2024	142.2
2025	40.2
Thereafter	507.5
Total minimum principal and interest payments	876.3
Less: Amount representing interest	(196.7)
Total aggregate finance lease and debt payments	$ 679.6		$ 576.6

Debt Obligations - Narrative (D

Debt Obligations - Narrative (Details)	May 31, 2021USD ($)	May 27, 2021USD ($)	Feb. 23, 2021USD ($)	Feb. 01, 2021USD ($)$ / shares	Jun. 30, 2021USD ($)$ / shares	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)$ / shares	Jun. 30, 2020USD ($)
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
UMB Bank | Revolving Credit Facility
Debt Instrument [Line Items]
Face amount	$ 110,000,000
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
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
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		$ 20,000,000
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%

Supplementary Financial Infor_3

Supplementary Financial Information - Contract in Progress (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting [Abstract]
Costs incurred on contracts in progress	$ 1,611.6	$ 752.9
Estimated earnings	254	139
Cost earned on uncompleted contract gross	1,865.6	891.9
Less progress billings	1,948.7	888.5
Net of cost earned on uncompleted contracts	(83.1)	3.4
Costs and recognized earnings in excess of billings on uncompleted contracts	63.7	55.6
Billings in excess of costs and recognized earnings on uncompleted contracts	$ (146.8)	$ (52.2)

Supplementary Financial Infor_4

Supplementary Financial Information - Schedule of Other Invested Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Summary of Investment Holdings [Line Items]
Measurement Alternative	$ 11.8	$ 11.8
Equity Method	41.3	43.6
Total	53.1	55.4
Common stock
Summary of Investment Holdings [Line Items]
Measurement Alternative	0	0
Equity Method	2.5	2.5
Total	2.5	2.5
Preferred stock
Summary of Investment Holdings [Line Items]
Measurement Alternative	0	0
Equity Method	12.1	15.4
Total	12.1	15.4
Fixed maturities
Summary of Investment Holdings [Line Items]
Measurement Alternative	0.5	0.5
Equity Method	0	0
Total	0.5	0.5
Other
Summary of Investment Holdings [Line Items]
Measurement Alternative	11.3	11.3
Equity Method	26.7	25.7
Total	$ 38	$ 37

Supplementary Financial Infor_5

Supplementary Financial Information - Schedule of Financial Instruments Measured on Not Measured at Fair Value (Details) - Nonrecurring - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Level 1
Assets
Other invested assets	$ 0	$ 0
Total assets not accounted for at fair value	0	0
Liabilities
Debt obligations	0	0
Total liabilities not accounted for at fair value	0	0
Level 2
Assets
Other invested assets	0	0
Total assets not accounted for at fair value	0	0
Liabilities
Debt obligations	692.7	579.2
Total liabilities not accounted for at fair value	692.7	579.2
Level 3
Assets
Other invested assets	11.3	11.3
Total assets not accounted for at fair value	11.3	11.3
Liabilities
Debt obligations	0	0
Total liabilities not accounted for at fair value	0	0
Carrying Value
Assets
Other invested assets	11.3	11.3
Total assets not accounted for at fair value	11.3	11.3
Liabilities
Debt obligations	676.3	560.7
Total liabilities not accounted for at fair value	676.3	560.7
Estimated Fair Value
Assets
Other invested assets	11.3	11.3
Total assets not accounted for at fair value	11.3	11.3
Liabilities
Debt obligations	692.7	579.2
Total liabilities not accounted for at fair value	$ 692.7	$ 579.2

Supplementary Financial Infor_6

Supplementary Financial Information - Schedule of Other Non-Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting [Abstract]
Right of use asset	$ 72.2	$ 39.8
Other	4.5	2.4
Total other non-current assets	$ 76.7	$ 42.2

Supplementary Financial Infor_7

Supplementary Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting [Abstract]
Accrued expenses and other current liabilities	$ 42.2	$ 27.9
Accrued payroll and employee benefits	32.6	34.7
Accrued interest	26.7	13.9
Accrued income taxes	0.4	0.6
Total accrued liabilities	$ 101.9	$ 77.1

Supplementary Financial Infor_8

Supplementary Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting [Abstract]
Lease liability, net of current portion	$ 60.4	$ 31.6
Other	10.2	8.2
Total other non-current liabilities	$ 70.6	$ 39.8

Leases - Right-of-use Assets an

Leases - Right-of-use Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Right-of-use assets:
Operating lease (Other non-current assets)	$ 72.2	$ 39.8
Finance lease (Property, plant and equipment, net)	0.3	0.9
Total right-of-use assets	72.5	40.7
Lease liabilities:
Current portion of operating lease (Other current liabilities)	16.2	11.2
Non-current portion of operating lease (Other non-current liabilities)	60.4	31.6
Finance lease (Debt obligations)	0.2	0.8
Total lease liabilities	$ 76.8	$ 43.6
Operating lease (Other non-current assets)	us-gaap:OtherAssets	us-gaap:OtherAssets
Finance lease (Property, plant and equipment, net)	Property, plant and equipment, net	Property, plant and equipment, net
Current portion of operating lease (Other current liabilities)	Other current liabilities	Other current liabilities
Non-current portion of operating lease (Other non-current liabilities)	Other liabilities	Other liabilities
Finance lease (Debt obligations)	Debt obligations	Debt obligations

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finance lease cost:
Amortization of right-of-use assets	$ 0.3	$ 0.3	$ 0.6	$ 0.6
Interest on lease liabilities	0	0	0	0.1
Net finance lease cost	0.3	0.3	0.6	0.7
Operating lease cost	4.3	3.5	7.8	7.2
Variable lease cost	0.1	0.1	0.2	0.2
Total lease cost	$ 4.7	$ 3.9	$ 8.6	$ 8.1

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 0	$ 0.1	$ 0	$ 0.1
Financing cash flows from finance leases	0.2	0.3	0.5	0.5
Operating cash flows from operating leases	4.2	3.6	7.9	7.1
Right-of-use assets obtained in exchange for new lease liabilities
Finance leases	0	0.1	0	0.1
Operating leases	$ 37.3	$ 3.6	$ 41.2	$ 12.1

Leases - Weighted Average Remai

Leases - Weighted Average Remaining Lease Term and Discount Rate (Details)	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Weighted-average remaining lease term (years) - operating lease	8 years	4 years 4 months 24 days
Weighted-average remaining lease term (years) - finance lease	1 year	10 months 24 days
Weighted-average discount rate - operating lease	5.20%	6.20%
Weighted-average discount rate - finance lease	7.00%	8.90%

Leases - Future Payments of Lea

Leases - Future Payments of Lease Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Operating Leases
2021	$ 19.6
2022	16.6
2023	12.4
2024	8.9
2025	6.4
Thereafter	29.8
Total future lease payments	93.7
Less: Present values	(17.1)
Total lease liability balance	76.6
Finance Leases
2021	0.2
2022	0
2023	0
2024	0
2025	0
Thereafter	0
Total minimum principal and interest payments	0.2
Less: Present values	0
Total lease liability balance	$ 0.2	$ 0.8

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Mar. 31, 2021
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 2.6	$ 12	$ 3.7	$ 2.3
Operating loss carryforwards, US						$ 96
Reduced deferred tax asset carryforward					$ 69.6
CARES Act
Operating Loss Carryforwards [Line Items]
Deferred employer payroll tax obligation	10.9		10.9
CARES Act | Accrued Liabilities
Operating Loss Carryforwards [Line Items]
Deferred employer payroll tax obligation	5.4		5.4
CARES Act | Other Liabilities
Operating Loss Carryforwards [Line Items]
Deferred employer payroll tax obligation	$ 5.5		$ 5.5
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards					170.3
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Foreign operating loss carryforward					$ 112.6
Foreign Tax Authority | Energy Segment
Operating Loss Carryforwards [Line Items]
Foreign operating loss carryforward						$ 29.3

Commitments and Contingencies (

Commitments and Contingencies (Details)	Mar. 15, 2021plaintiff
DTV America Corporation Stockholders
Loss Contingencies [Line Items]
Number of plaintiffs	22
DTV America Corporation Stock Option Holders
Loss Contingencies [Line Items]
Number of plaintiffs	8

Share-based Compensation - Narr

Share-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1.1	$ 1.5
Intrinsic value of options outstanding	$ 0.2
Average remaining life of option outstanding	3 years 1 month 6 days
Intrinsic value of exercisable options	$ 0.2
Average remaining life of exercisable options	3 years 1 month 6 days
Unvested shares expected to vest (in shares)	1,350
Weighted average remaining life	7 years 8 months 12 days
Weighted average exercise price (in usd per share)	$ 2.62
Intrinsic value	$ 0.1
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 2
Unrecognized compensation expense, period for recognition	2 years 2 months 12 days
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 0.1
Unrecognized compensation expense, period for recognition	8 months 12 days

Share-based Compensation - Summ

Share-based Compensation - Summary of Company's Restricted Stock Activity (Details) - Restricted Stock - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Shares
Unvested at beginning of period (in shares)	628,433	2,213,775
Granted (in shares)	593,458	1,152,202
Vested (in shares)	(425,222)	(2,258,905)
Forfeited (in shares)	(31,171)	(478,639)
Unvested at end of period (in shares)	765,498	628,433
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in usd per share)	$ 3.93	$ 5.12
Granted (in usd per share)	3.81	2.74
Vested (in usd per share)	3.74	4.08
Forfeited (in usd per share)	2.62	5.87
Unvested at end of period (in usd per share)	$ 4	$ 3.93

Share-based Compensation - Su_2

Share-based Compensation - Summary of Company's Stock Option Activity (Details) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Shares
Outstanding at beginning of period (in shares)	4,739,858	7,067,592
Granted (in shares)	0	143,096
Exercised (in shares)	0	0
Forfeited (in shares)	0	(142,503)
Expired (in shares)	(21,599)	(2,328,327)
Outstanding at end of period (in shares)	4,718,259	4,739,858
Shares, Eligible for exercise (in shares)	4,716,909
Weighted Average Exercise Price
Outstanding at beginning of period (in usd per share)	$ 5.13	$ 6.52
Granted (in usd per share)	0	2.62
Exercised (in usd per share)	0	0
Forfeited (in usd per share)	0	5.45
Expired (in usd per share)	5.45	9.18
Outstanding at end of period (in usd per share)	5.13	$ 5.13
Weighted average exercise price, Eligible for exercise (in usd per share)	$ 5.13

Equity - Preferred Stock (Detai

Equity - Preferred Stock (Details) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Par value (in usd per share)	$ 0.001	$ 0.001
Preferred shares authorized (in shares)	20,000,000	20,000,000
Series A shares issued and outstanding
Class of Stock [Line Items]
Shares issued (in shares)	0	6,375
Shares outstanding (in shares)	0	6,375
Series A-2 shares issued and outstanding
Class of Stock [Line Items]
Shares issued (in shares)	0	4,000
Shares outstanding (in shares)	0	4,000

Equity - Narrative (Details)

Equity - Narrative (Details) - USD ($) $ in Millions	May 29, 2021	Jan. 11, 2019	Aug. 02, 2016	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 20, 2018	Dec. 18, 2018
Class of Warrant or Right [Line Items]
Additional share consideration valued at				$ 0.3	$ 0.4
CGI
Class of Warrant or Right [Line Items]
Stock repurchase program, expected to be redemption	$ 16.1
Corrib Master Fund, Ltd. and Luxor Capital Partners, LP
Class of Warrant or Right [Line Items]
Preferred stock trading days to calculate volume weighted average price (at least)				30 days
Volume weighted average price threshold period				2 days
Percent of accrued value				1.875%
Series A-2 Preferred Stock | CGI
Class of Warrant or Right [Line Items]
Issuance and sale of common stock (in shares)		10,000
Series A-2 Preferred Stock | CGI | Eliminated Segment
Class of Warrant or Right [Line Items]
Issuance and sale of common stock (in shares)		10,000
Series A shares issued and outstanding
Class of Warrant or Right [Line Items]
Shares issued (in shares)				0		6,375
Series A shares issued and outstanding | CGI
Class of Warrant or Right [Line Items]
Shares issued (in shares)							6,125	6,125
Series A shares issued and outstanding | CGI | Eliminated Segment
Class of Warrant or Right [Line Items]
Shares issued (in shares)							6,125
Series A shares issued and outstanding | Corrib Master Fund, Ltd.
Class of Warrant or Right [Line Items]
Conversion of stock, number of shares (in shares)				13,477	17,933
Issuance and sale of common stock (in shares)			1,000
Series A shares issued and outstanding | Luxor Capital Partners, LP
Class of Warrant or Right [Line Items]
Conversion of stock, number of shares (in shares)				119,784	159,400
Common Stock
Class of Warrant or Right [Line Items]
Redemption of preferred stock	$ 10.4
Number of shares of common stock from conversion (in shares)	50,410
Common Stock | CGI
Class of Warrant or Right [Line Items]
Conversion of stock, number of shares (in shares)				1,872,659
Common Stock | DG Value Partners, LP and DG Value Partners II Master Funds LP
Class of Warrant or Right [Line Items]
Conversion of stock, number of shares (in shares)				1,763,706
Series A-1 shares issued and outstanding | Luxor Capital Partners, LP
Class of Warrant or Right [Line Items]
Issuance and sale of common stock (in shares)			9,000

Equity - Summary of Cash Divide

Equity - Summary of Cash Dividends (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity [Abstract]
Total Dividend	$ 0.2	$ 0.2	$ 0.1	$ 0.2

Related Parties (Details)

Related Parties (Details)	May 27, 2021USD ($)	May 31, 2021plane	Sep. 30, 2018	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)space	Jun. 30, 2020USD ($)
Related Party Transaction [Line Items]
Lessee, lease term			75 months
Operating cash flows from operating leases				$ 4,200,000	$ 3,600,000	$ 7,900,000	$ 7,100,000
Total lease liability balance				76,600,000		76,600,000
Banker Steel Acquisition
Related Party Transaction [Line Items]
Bankers Steel debt - assumed	$ 6,300,000
Subordinated Debt
Related Party Transaction [Line Items]
Interest expense				100,000	0	100,000	0
Subordinated Debt | Banker Steel Acquisition
Related Party Transaction [Line Items]
Bankers Steel debt - assumed				6,300,000		6,300,000
Subordinated Borrowing, Interest Rate	11.00%
Triple Ring | Affiliated Entity
Related Party Transaction [Line Items]
Expenses under service agreement				0	300,000	$ 0	1,000,000
Banker Steel | Affiliated Entity | Office Space
Related Party Transaction [Line Items]
Number of office spaces | space						2
Operating cash flows from operating leases						$ 10,000
Lease expense				10,000	0	10,000	0
Total lease liability balance				200,000		200,000
Banker Steel | Affiliated Entity | Planes
Related Party Transaction [Line Items]
Operating cash flows from operating leases						200,000
Lease expense				200,000	$ 0	200,000	$ 0
Total lease liability balance				$ 4,500,000		$ 4,500,000
Number of planes leased | plane		2

Operating Segment and Related_3

Operating Segment and Related Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2021segment
Segment Reporting [Abstract]
Number of reportable geographic segments	1
Number of reportable operating segments	4

Operating Segment and Related_4

Operating Segment and Related Information - Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 243.8	$ 181.8	$ 415.6	$ 368.4
Total revenue	243.8	181.8	415.6	368.4
Income (loss) from operations	(7.7)	(8.9)	(18.6)	(22.5)
Interest expense	(12.4)	(19.1)	(33.8)	(38.3)
Loss on early extinguishment or restructuring of debt	(1.6)	(3.4)	(12.4)	(9.2)
Income (loss) from equity investees	0.2	(0.2)	(1.9)	(2.7)
Other income	0.4	64.6	3.8	66.1
(Loss) income from continuing operations before income taxes	(21.1)	33	(62.9)	(6.6)
Income tax expense	(2.6)	(12)	(3.7)	(2.3)
(Loss) income from continuing operations	(23.7)	21	(66.6)	(8.9)
(Loss) income from discontinued operations (including gain on disposal of $40.4 million and loss on disposal of $39.3 million for the six months ended June 30, 2021 and 2020, respectively)	(1.5)	7.5	50.4	(63.6)
Net (loss) income	(25.2)	28.5	(16.2)	(72.5)
Net income (loss) attributable to noncontrolling interest and redeemable noncontrolling interest	1.7	(15.4)	5.3	2.5
Net (loss) income attributable to HC2 Holdings, Inc.	(23.5)	13.1	(10.9)	(70)
Less: Preferred dividends and deemed dividends from conversions	0.2	0.4	0.6	0.8
Net (loss) income attributable to common stock and participating preferred stockholders	(23.7)	12.7	(11.5)	(70.8)
Depreciation and Amortization	4.8	4.5	8.7	8.8
Depreciation expense with cost of revenue	2.8	2.3	5	4.6
Total depreciation and amortization	7.6	6.8	13.7	13.4
Capital Expenditures	4.8	5	8	10
Gain (loss) on sale of subsidiary			40.4	(39.3)
Infrastructure
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	232	171.7	393.3	348.2
Total revenue	232	172.3	393.3	348.8
Life Sciences
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	1.2	0	1.2	0
Spectrum
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	10.6	9.5	21.1	19.6
Operating Segments | Infrastructure
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	232	172.3	393.3	348.8
Income (loss) from operations	2.2	4.5	4.4	7.1
Depreciation and Amortization	3.3	2.7	5.7	5.3
Capital Expenditures	3.9	1.1	5.5	3.4
Operating Segments | Life Sciences
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1.2	0	1.2	0
Income (loss) from operations	(4.5)	(3.5)	(9.3)	(6.7)
Depreciation and Amortization	0.1	0.1	0.1	0.1
Capital Expenditures	0.3	0.1	0.5	0.1
Operating Segments | Spectrum
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	10.6	9.5	21.1	19.6
Income (loss) from operations	1.4	(1.2)	0.2	(4.1)
Depreciation and Amortization	1.4	1.7	2.9	3.4
Capital Expenditures	0.6	3.7	2	6.4
Operating Segments | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Income (loss) from operations	(0.2)	(0.7)	(0.6)	(1.7)
Non-operating Corporate
Revenues from External Customers and Long-Lived Assets [Line Items]
Income (loss) from operations	(6.6)	(8)	(13.3)	(17.1)
Capital Expenditures	$ 0	$ 0.1	$ 0	$ 0.1

Operating Segment and Related_5

Operating Segment and Related Information - Long-term investments, Property and Equipment and Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Investments	$ 53.1	$ 55.4
Total Assets	6,935.9	6,742.8
Operating Segments | Infrastructure
Revenues from External Customers and Long-Lived Assets [Line Items]
Investments	0.9	0.9
Total Assets	858.9	494.8
Operating Segments | Life Sciences
Revenues from External Customers and Long-Lived Assets [Line Items]
Investments	15.1	18.4
Total Assets	20.4	21.4
Operating Segments | Spectrum
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	206	213.6
Operating Segments | Insurance
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	5,849	5,854
Operating Segments | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Investments	37.1	36.1
Total Assets	40.8	167.3
Non-operating Corporate
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	4.2	30.1
Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	$ (43.4)	$ (38.4)

Basic and Diluted Income (Los_3

Basic and Diluted Income (Loss) Per Common Share - Narrative (Details) - shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities (in shares)	0	0

Basic and Diluted Income (Los_4

Basic and Diluted Income (Loss) Per Common Share - Basic Income (Loss) Per Common Share to Diluted Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
(Loss) income from continuing operations	$ (23,700)	$ 21,000	$ (66,600)	$ (8,900)
Income (loss) attributable to noncontrolling interest and redeemable noncontrolling interest	1,600	(15,300)	4,400	(12,500)
(Loss) income from continuing operations attributable to the Company	(22,100)	5,700	(62,200)	(21,400)
Less: Preferred dividends, deemed dividends and repurchase gains	200	400	600	800
(Loss) income from continuing operations attributable to HC2 common stockholders	(22,300)	5,300	(62,800)	(22,200)
(Loss) income from discontinued operations	(1,500)	7,500	50,400	(63,600)
(Loss) income attributable to noncontrolling interest and redeemable noncontrolling interest	100	(100)	900	15,000
(Loss) income from discontinued operations, net of tax and noncontrolling interest	(1,400)	7,400	51,300	(48,600)
Net (loss) income attributable to common stock and participating preferred stockholders	$ (23,700)	$ 12,700	$ (11,500)	$ (70,800)
Participating shares at end of period:
Weighted-average common stock outstanding (in shares)	77	46.8	77.1	45.9
Unvested restricted stock (in shares)		0.3
Preferred stock (as-converted basis) (in shares)		2.1
Total (in shares)	77	49.2	77.1	45.9
Percentage of loss allocated to:
Common stock	100.00%	95.10%	100.00%	100.00%
Unvested restricted stock	0.00%	0.60%	0.00%	0.00%
Preferred stock	0.00%	4.30%	0.00%	0.00%
Net (loss) income from continuing operations attributable to common stock, basic	$ (22,300)	$ 5,000	$ (62,800)	$ (22,200)
Net (loss) income from discontinued operations attributable to common stock, basic	(1,400)	7,100	51,300	(48,600)
Net (loss) income attributable to common stock, basic	(23,700)	12,100	(11,500)	(70,800)
Earnings allocable to common shares, diluted:
Effect of assumed shares under the if-converted method for convertible instruments	0	0	0	0
Net (loss) income from continuing operations attributable to common stock, basic	(22,300)	5,000	(62,800)	(22,200)
Net (loss) income from discontinued operations attributable to common stock, basic	(1,400)	7,100	51,300	(48,600)
Net (loss) income attributable to common stock, basic	$ (23,700)	$ 12,100	$ (11,500)	$ (70,800)
Denominator for basic and dilutive earnings per share
Weighted average common shares outstanding - basic (in shares)	77	46.8	77.1	45.9
Effect of assumed shares under treasury stock method for stock options and restricted shares and if-converted method for convertible instruments (in shares)	0	2	0	0
Weighted average common shares outstanding - diluted (in shares)	77	48.8	77.1	45.9
(Loss) income per share - continuing operations
Basic (in usd per share)	$ (0.29)	$ 0.11	$ (0.82)	$ (0.48)
Diluted (in usd per share)	(0.29)	0.11	(0.82)	(0.48)
(Loss) income per common share - discontinued operations
Basic (in usd per share)	(0.02)	0.15	0.67	(1.06)
Diluted (in usd per share)	(0.02)	0.14	0.67	(1.06)
(Loss) income per share - Net (loss) income attributable to common stock and participating preferred stockholders
Basic (in usd per share)	(0.31)	0.26	(0.15)	(1.54)
Diluted (in usd per share)	$ (0.31)	$ 0.25	$ (0.15)	$ (1.54)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Millions	Jul. 21, 2021	Jul. 01, 2021	Aug. 02, 2021	Jul. 14, 2021	Jun. 30, 2021
R2 Dermatology, Inc.
Subsequent Event [Line Items]
Parents interest, controlling					51.00%
Subsequent Event | Non-core Assets
Subsequent Event [Line Items]
Transaction value			$ 4	$ 6.5
Subsequent Event | Discontinued Operations | Continental General Insurance Company and Continental LTC Inc.
Subsequent Event [Line Items]
Disposal group, including discontinued operation, consideration, percentage		6.60%
Transaction value		$ 90
Proceeds from divestiture of businesses		$ 65
Subsequent Event | R2 Dermatology, Inc.
Subsequent Event [Line Items]
Additions investments	$ 15
Investment owned, at fair value	$ 150
Parents interest, controlling	50.40%
Subsequent Event | Michael Gorzynsk
Subsequent Event [Line Items]
Percentage of proxy and voting rights from minority holders		10.80%