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	$ 216.0
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	0.0	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	0.0	1.4
Property, plant and equipment, net	1.4	90.5
Goodwill	0.0	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
Current liabilities
Accounts payable	0.0	2.6
Accrued liabilities	8.8	35.8
Current portion of debt obligations	0.0	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	0.0	50.6
Other liabilities	8.6	12.0
Total liabilities held for sale	$ 5,261.6	$ 5,306.7