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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Maturity period (less than)			10 years
Average maturity period (less than)			10 years
Interest receivable		$ 10.0	$ 10.0	$ 12.0
Reduction in premiums			(4.0)
Marketplace risk adjustment payables		326.0	326.0	368.0
Risk adjustment receivable		20.0	20.0	63.0
Risk adjustment, net payable		306.0	306.0	305.0
Prepaid reinsurance premiums		9.0	9.0	17.0	$ 16.0
Reinsurance recoveries			23.0	18.0	33.0
Reinsurance recoverable		17.0	17.0	$ 21.0	$ 31.0
HIF liabilities		277.0	277.0
Maine Community Health Options v. United States
Property, Plant and Equipment [Line Items]
Summary judgement	$ 128.0
COVID-19
Property, Plant and Equipment [Line Items]
Reduction in premiums		$ 401.0	564.0
COVID-19 | MMP Plans
Property, Plant and Equipment [Line Items]
Reduction in premiums			$ 37.0
PUERTO RICO | Medicaid
Property, Plant and Equipment [Line Items]
Premium deficiency reserve						$ 10.0
Minimum
Property, Plant and Equipment [Line Items]
Useful life			5 years
Minimum | Premium revenue
Property, Plant and Equipment [Line Items]
Percentage of additional incremental revenue earned			1.00%
Maximum
Property, Plant and Equipment [Line Items]
Useful life			16 years
Maximum | Premium revenue
Property, Plant and Equipment [Line Items]
Percentage of additional incremental revenue earned			4.00%
Structured Securities
Property, Plant and Equipment [Line Items]
Average maturity period (less than)			10 years

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