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Fair Value Measurements - Fair Value of Senior Convertible Notes (Details) - Senior Notes - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of outstanding senior convertible notes | $ 2,150.8 | $ 1,399.8
Senior convertible notes due 2022 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of outstanding senior convertible notes | 890.8 | 540.2
Senior convertible notes due 2023 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of outstanding senior convertible notes | $ 1,260.0 | $ 859.6

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