Financial Instruments - Summary of Contractual Maturities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Estimated Fair Value
Due in one year or less	$ 900.0	$ 807.2
Due after one year through five years	454.7	419.5
Due after five years	10.9	12.4
Total marketable debt securities	1,365.6	1,239.1
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Due in one year or less	900.8	807.2
Due after one year through five years	455.9	419.3
Due after five years	10.9	12.4
Total marketable debt securities	$ 1,367.6	$ 1,238.9