Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 1,662.7	$ 1,774.1
Life, accident and health earned premiums, net	116.9	94.4
Net investment income	203.8	116.6
Net realized and unrealized gains (losses) on investments	0.7	(8.4)
Net revenue	1,984.1	1,976.7
Operating expenses
Cost of revenue	1,424.9	1,585.2
Policy benefits, changes in reserves, and commissions	234.4	197.3
Selling, general and administrative	214.3	218.4
Depreciation and amortization	32.0	31.7
Asset impairment expense	55.0	1.0
Other operating income	(5.6)	(1.1)
Total operating expenses	1,955.0	2,032.5
Income (loss) from operations	29.1	(55.8)
Interest expense	(95.1)	(75.7)
Gain on sale and deconsolidation of subsidiary	0.0	105.1
Income from equity investees	2.2	15.4
Gain on bargain purchase	1.1	115.4
Other income	6.0	77.9
(Loss) income from continuing operations	(56.7)	182.3
Income tax benefit (expense)	20.6	(2.4)
Net (loss) income	(36.1)	179.9
Net loss (income) attributable to noncontrolling interest and redeemable noncontrolling interest	4.6	(17.9)
Net (loss) income attributable to HC2 Holdings, Inc.	(31.5)	162.0
Less: Preferred dividends, deemed dividends, and repurchase gains	0.0	6.4
Net (loss) income attributable to common stock and participating preferred stockholders	$ (31.5)	$ 155.6
(Loss) income per common share
Basic (in dollars per share)	$ (0.66)	$ 3.14
Diluted (in dollars per share)	$ (0.66)	$ 2.90
Weighted average common shares outstanding:
Basic (in shares)	44.8	44.3
Diluted (in shares)	44.8	46.8