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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 18, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |
Maturity period |  |  | 10 years |  |
Average maturity period |  |  | 10 years |  |
Interest receivable |  | $ 10.0 | $ 10.0 |  | $ 12.0
Risk adjustment payable |  | 529.0 | 529.0 |  | (368.0)
Risk adjustment receivable |  | 72.0 | 72.0 |  | 63.0
Risk adjustment, net payable |  | 457.0 | 457.0 |  | $ 305.0
Risk adjustment, net payable, current year |  | (160.0) | (160.0) |  |
Risk adjustment, net payable, prior year |  | 297.0 | 297.0 |  |
HIF liabilities |  | 277.0 | 277.0 | $ 271.0 |
Increase in HIF liabilities |  |  | $ 6.0 |  |
Maine Community Health Options v. United States |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |
Summary judgement | $ 128.1 |  |  |  |
COVID-19 |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |
Reduction in premiums |  | $ 75.0 |  |  |

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