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Fair Value Measurements - Estimated Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value Disclosures [Line Items] |  |
Total fair value of outstanding senior convertible notes | $ 2,433.3 | $ 2,544.6
Senior Convertible Notes due 2025 |  |
Fair Value Disclosures [Line Items] |  |
Total fair value of outstanding senior convertible notes | 1,209.9 | 1,262.8
Senior Convertible Notes due 2028 |  |
Fair Value Disclosures [Line Items] |  |
Total fair value of outstanding senior convertible notes | $ 1,223.4 | $ 1,281.8

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