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Investment Securities - Investment Gains (Losses) for Level 3 (Details) - Other long-term investments - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Gain (Loss) on Securities [Line Items] |  |
Net unrealized investment gains (losses) | $ 7.1 | $ 5.9
Level 3 |  |
Gain (Loss) on Securities [Line Items] |  |
Net unrealized investment gains (losses) | $ (6.2) | $ 37.0

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