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Investments - Contractual Maturities of Available-for-Sale Marketable Investments (Details)
$ in Millions
Mar. 31, 2024
USD ($)
Amortized Cost  
Due within one year $ 1,489.8
Due in one to three years 1,498.8
Total 2,988.6
Fair Value  
Due within one year 1,477.4
Due in one to three years 1,491.9
Total $ 2,969.3