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Investment Securities - Investment Gains and Losses For Level 3 (Details) - Other long-term investments - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Gain (Loss) on Securities [Line Items] |  |  |
Total net unrealized investment gains recognized during the period on Level 3 investments held at the end of period | $ 180.2 | $ 58.9 | $ 195.2
Level 3 |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Total net unrealized investment gains recognized during the period on Level 3 investments held at the end of period | $ 127.7 | $ 57.2 | $ 133.9

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