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Fair Value Measurements - Fair Value of Convertible Senior Notes (Details) - Senior Notes - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | $ 3,487.2 | $ 3,451.1
Senior Convertible Notes due 2023 |  |
Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | 2,189.0 | 2,136.2
Senior Convertible Notes due 2025 |  |
Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | $ 1,298.2 | $ 1,314.9

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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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