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Fair Value Measurements - Estimated Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value Disclosures [Line Items] |  |
Total fair value of outstanding senior convertible notes | $ 2,340.0 | $ 2,286.0
Senior Convertible Notes due 2025 |  |
Fair Value Disclosures [Line Items] |  |
Total fair value of outstanding senior convertible notes | 1,199.6 | 1,163.7
Senior Convertible Notes due 2028 |  |
Fair Value Disclosures [Line Items] |  |
Total fair value of outstanding senior convertible notes | $ 1,140.4 | $ 1,122.3

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