Marketable Securities and Equity Investments - Available-for-Sale Debt Securities at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Total cash equivalents and marketable securities, Fair Value	$ 8,094.0	$ 8,341.3
Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total cash equivalents and marketable securities, Fair Value	1,411.0	1,687.1
Marketable securities
Debt Securities, Available-for-sale [Line Items]
Total cash equivalents and marketable securities, Fair Value	1,526.5	1,546.3
Long-term marketable securities
Debt Securities, Available-for-sale [Line Items]
Total cash equivalents and marketable securities, Fair Value	$ 5,156.5	$ 5,107.9