Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net loss	$ (101.0)	$ (6.3)
Less: Loss from discontinued operations, net of tax	(60.0)	(6.6)
(Loss) income from continuing operations	(41.0)	0.3
Adjustments to reconcile (loss) income to cash provided by continuing operating activities
Depreciation and amortization	2.9	2.4
Amortization of deferred financing costs and debt discount	3.8	2.7
Amortization of (discount) premium on investments	2.0	1.6
Loss on early extinguishment or restructuring of debt	5.8	0.0
Loss from equity investees	2.5	5.9
Deferred income taxes	19.7	(0.6)
Net realized and unrealized gains on investments	18.3	(5.8)
Other operating activities	3.0	(0.4)
Changes in assets and liabilities, net of acquisitions and disposition:
Accounts receivable	(21.6)	50.8
Recoverable from reinsurers	(4.8)	1.9
Other assets	(53.7)	(5.6)
Life, accident and health reserves	27.1	7.5
Accounts payable and other current liabilities	55.5	(24.9)
Other liabilities	16.6	(1.8)
Cash provided by continuing operating activities	36.1	34.0
Cash (used in) provided by discontinued operating activities	(0.8)	4.1
Cash provided by operating activities	35.3	38.1
Cash flows from investing activities
Purchase of property, plant and equipment	(6.1)	(3.3)
Disposal of property, plant and equipment	0.5	1.0
Purchase of investments	(278.2)	(257.9)
Sale of investments	175.0	199.0
Maturities and redemptions of investments	31.0	13.9
Proceeds from divestiture of businesses	144.0	0.0
Cash paid for acquisitions, net	0.0	(6.0)
Other investing activities	0.9	(3.2)
Cash provided by (used in) continuing investing activities	67.1	(56.5)
Cash used in discontinued investing activities	(7.0)	(1.9)
Cash provided by (used in) investing activities	60.1	(58.4)
Cash flows from financing activities
Proceeds from debt obligations	3.9	16.4
Principal payments on debt obligations	(101.3)	(2.6)
Cash paid by subsidiary to purchase HC2 preferred stock	0.0	(8.3)
Annuity receipts	0.4	0.5
Annuity surrenders	(3.4)	(4.4)
Transactions with noncontrolling interests	(42.5)	(3.5)
Other financing activities	(2.9)	(1.9)
Cash used in continuing financing activities	(145.8)	(3.8)
Cash used in discontinued financing activities	(2.4)	(2.6)
Cash used in financing activities	(148.2)	(6.4)
Effects of exchange rate changes on cash, cash equivalents and restricted cash	0.5	0.1
Net change in cash, cash equivalents and restricted cash	(42.1)	(26.2)
Cash, cash equivalents and restricted cash, beginning of period	230.4	321.3
Cash, cash equivalents and restricted cash, end of period	188.3	295.1
Supplemental cash flow information:
Cash paid for interest	6.1	3.3
Cash paid for taxes, net of (refunds)	$ (0.1)	$ 0.2