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Fair Value Measurements - Narrative (Details) | Sep. 30, 2020 USD ($) | Jun. 17, 2020 USD ($)
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Embedded exchange feature |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
10 percent decrease in stock price volatility, fair value | $ 42,400,000 |
10 percent increase in stock price volatility, fair value | 76,400,000 |
Capped call derivatives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
10 percent decrease in stock price volatility, fair value | 29,300,000 |
10 percent increase in stock price volatility, fair value | $ 42,300,000 |
Senior Notes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt instrument, face amount |  | $ 287,500,000
2020 Cash Exchangeable Senior Notes | Senior Notes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt instrument, face amount |  | $ 287,500,000
Measurement Input, Stock Price Volatility | Embedded exchange feature |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative liability, measurement input | 0.37 |
Measurement Input, Stock Price Volatility | Capped call derivatives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative liability, measurement input | 0.37 |

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