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Investments - Current and Non-current of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Reported under the following captions in our consolidated balance sheets: |  |
Total | $ 2,126.1 | $ 3,050.0
Cash and cash equivalents |  |
Reported under the following captions in our consolidated balance sheets: |  |
Current available-for-sale debt securities | 0.0 | 37.0
Current marketable investments |  |
Reported under the following captions in our consolidated balance sheets: |  |
Current available-for-sale debt securities | 808.7 | 1,236.3
Non-current marketable investments |  |
Reported under the following captions in our consolidated balance sheets: |  |
Non-current marketable investments | $ 1,317.4 | $ 1,776.7

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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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