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Investments - Equity Securities and Other Long-Term Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Other long-term investments, Cost or amortized cost | $ 437.9 | $ 438.2
Other long-term investments, Gross unrealized gains | 32.3 | 37.5
Other long-term investments, Gross unrealized losses | (154.8) | (162.7)
Other long-term investments, net foreign currency gains | 2.3 | 3.5
Other long-term investments, Fair value | $ 317.7 | $ 316.5

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