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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Summary of financial assets with maturities of less than 90 days included within cash and cash equivalents | The following table summarizes our financial assets with maturities of less than 90 days from the date of purchase included in cash and cash equivalents in our condensed consolidated balance sheets:
(In millions) |  | As of March 31, 2025 |  | As of December 31, 2024
Money market funds |  | $ | 2,109.0 |  |  | $ | 1,664.9 |
Total |  | $ | 2,109.0 |  |  | $ | 1,664.9 |
Marketable debt and equity securities | The following tables summarize our marketable equity securities, classified as available-for-sale:
|  | As of March 31, 2025
(In millions) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Marketable equity securities |  |  |  |  |  |  |  |
Marketable equity securities, non-current |  | $ | 668.7 |  |  | $ | — |  |  | $ | (521.8) |  |  | $ | 146.9 |
Total marketable equity securities |  | $ | 668.7 |  |  | $ | — |  |  | $ | (521.8) |  |  | $ | 146.9 |
|  | As of December 31, 2024
(In millions) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Marketable equity securities |  |  |  |  |  |  |  |
Marketable equity securities, non-current |  | $ | 668.7 |  |  | $ | — |  |  | $ | (489.0) |  |  | $ | 179.7 |
Total marketable equity securities |  | $ | 668.7 |  |  | $ | — |  |  | $ | (489.0) |  |  | $ | 179.7 |

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