Cash, Cash Equivalents, and Investments - Cost and Estimated Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Estimated Fair Value
Due within one year	$ 5.9	$ 0.0
Due after one year through two years	0.5	0.0
Estimated Fair Value	$ 6.4	$ 0.0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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