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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Risk adjustment payable | $ 163.0 | $ 230.0
Risk adjustment receivable | 246.0 | 135.0
Risk adjustment, net receivable | 83.0 |
Risk adjustment, credit loss allowances | $ 41.0 |
Risk adjustment, net payable |  | $ 95.0
Maturity period (less than) | 15 years |
Structured Securities |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Average maturity period (less than) | 15 years |

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