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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Percentage of level 3 invested assets in total investment portfolio | 9.10% |  | 9.10% |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Net investment gains (losses) included in net income related to financial assets | $ (0.9) | $ 0.2 | $ 4.9 | $ 0.3
Net investment gains (losses) included in net income related to financial liabilities | $ (3.7) | $ 0.3 | $ (5.6) | $ (1.0)

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