Investments - Equity Securities and Other Long-Term Investments (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Investments, Debt and Equity Securities [Abstract] | ||
| Other long-term investments, Cost or amortized cost | $ 436.2 | $ 438.2 |
| Other long-term investments, Gross unrealized gains | 33.4 | 37.5 |
| Other long-term investments, Gross unrealized losses | (151.4) | (162.7) |
| Other long-term investments, net foreign currency gains | 1.9 | 3.5 |
| Other long-term investments, Fair value | $ 320.1 | $ 316.5 |