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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of level 3 invested assets in total investment portfolio | 8.60% |  | 8.60% |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net investment gains (losses) included in net income related to financial assets | $ (0.3) | $ (0.4) | $ 4.6 | $ (0.1)
Net investment gains (losses) included in net income related to financial liabilities | $ 1.2 | $ (6.6) | $ (4.4) | $ (7.6)

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