Additional Balance Sheet & Cash Flow Information - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 4,939.6	$ 4,569.6	$ 5,239.2	$ 10,369.1
Prepaid expenses and other current assets	8.2	2.6	8.9	3.2
Cash, cash equivalents and restricted cash per condensed consolidated statement of cash flows	$ 4,947.8	$ 4,572.2	$ 5,248.1	$ 10,372.3