Financial Instruments - Summary of Contractual Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Estimated Fair Value
Due in one year or less	$ 1,473.5	$ 1,541.1
Due after one year through five years	694.4	868.2
Due after five years	11.3	23.8
Total marketable debt securities	2,179.2	2,433.1
Amortized Cost
Due in one year or less	1,483.3	1,541.7
Due after one year through five years	703.7	870.2
Due after five years	12.1	24.0
Amortized Cost	$ 2,199.1	$ 2,435.9