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Investments Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (4.9) | $ (86.3) | $ 12.7 | $ (99.6) |
Net Unrealized Gains Losses Recognized from Changes in Fair Value of Equity Securities Held | 0.6 | $ (85.5) | 61.2 | $ 97.2 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 1.6 |  | $ 1.6 |  | $ 1.6

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