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Fair Value Measurements - Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Sep. 30, 2024 USD ($)	[1]
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 120.5
Mature in one to five years	702.9
Mature in more than five years	298.6
Total Amortized Cost	1,122.0
Mature in less than one year	120.4
Mature in one to five years	711.8
Mature in more than five years	301.1
Estimated Fair Value	$ 1,133.3
[1] Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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