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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investment securities |  |  |
Net unrealized investment gains (losses) | $ 58.9 | $ 195.2 | $ (43.8)
Level 3 |  |  |
Investment securities |  |  |
Net unrealized investment gains (losses) | $ 57.2 | $ 133.9 | $ 56.5

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