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Fair Value Measurements - Fair Value of Senior Convertible Notes (Details) - Senior Notes - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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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 | $ 4,022.5 | $ 3,155.6
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 | 2,589.6 | 1,936.4
Convertible Notes due 2025 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of outstanding senior convertible notes | $ 1,432.9 | $ 1,219.2

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