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Fair Value Measurements - Fair Value of Convertible Senior Notes (Details) - Senior Notes - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | $ 2,652.0 | $ 4,022.5
Senior Convertible Notes due 2023 |  |
Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | 1,533.4 | 2,589.6
Senior Convertible Notes due 2025 |  |
Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | $ 1,118.6 | $ 1,432.9

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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