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	0.0	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	0.0	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	0.0	0.0		(39.3)
Income from equity investees	0.0	0.0	0.0	0.5
Other (loss) income	0.0	(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)