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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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