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Cash and Cash Equivalents, Investments and Fair Value Measurements - Debt (Details) - Estimate of Fair Value Measurement - Senior Notes - Fair Value, Measurements, Nonrecurring - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Senior Notes due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	$ 186.4	$ 202.9
Senior Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	$ 343.7	$ 329.5

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