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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Percentage of level 3 invested assets in total investment portfolio | 9.50% |  | 9.50% |  | 9.50%
Net investment gains (losses) included in net income | $ (0.3) | $ (3.4) | $ 1.0 | $ (2.5) |
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Net investment gains (losses) included in net income | $ 0.2 | $ 0.0 | $ 0.3 | $ 0.0 |

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