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Fair Value Measurements and Investments Amortized Cost and Fair Value of Debt Securities (Details)
$ in Millions
Dec. 31, 2023
USD ($)
 [1]
Fair Value Disclosures [Abstract]  
Mature in less than one year $ 450.9
Mature in one to five years 558.6
Mature in more than five years 132.7
Total Amortized Cost 1,142.2
Mature in less than one year 448.2
Mature in one to five years 556.6
Mature in more than five years 131.2
Estimated Fair Value $ 1,136.0
[1] Available-for-sale investments are included in Short-term investments in the consolidated balance sheets.