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Fair Value Measurements - Fair Value of Convertible Senior Notes (Details) - Senior Notes - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | $ 3,499.3 | $ 2,150.8
Senior Convertible Notes due 2022 |  |
Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | 151.9 | 890.8
Senior Convertible Notes due 2023 |  |
Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | 2,108.2 | $ 1,260.0
Senior Convertible Notes due 2025 |  |
Fair Value Disclosures [Line Items] |  |
Fair value of outstanding senior convertible notes: | $ 1,239.2 |

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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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