Marketable Securities and Equity Investments - Available-for-Sale Debt Securities at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Total cash equivalents and marketable securities, Fair Value	$ 10,073.5	$ 10,014.7
Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total cash equivalents and marketable securities, Fair Value	2,569.8	2,779.1
Marketable securities
Debt Securities, Available-for-sale [Line Items]
Total cash equivalents and marketable securities, Fair Value	1,753.8	1,523.3
Long-term marketable securities
Debt Securities, Available-for-sale [Line Items]
Total cash equivalents and marketable securities, Fair Value	$ 5,749.9	$ 5,712.3

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details