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Fair Value Measurements and Investments Amortized Cost and Fair Value of Debt Securities (Details)
$ in Millions
Dec. 31, 2024
USD ($)
 [1]
Fair Value Disclosures [Abstract]  
Mature in less than one year $ 87.6
Mature in one to five years 712.2
Mature in more than five years 299.9
Total Amortized Cost 1,099.7
Mature in less than one year 87.5
Mature in one to five years 712.5
Mature in more than five years 297.6
Estimated Fair Value $ 1,097.6
[1] Available-for-sale investments are included in Short-term investments in the consolidated balance sheets.