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Fair Value Measurements - Narrative (Details) | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 17, 2020 USD ($)
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Embedded Derivative Financial Instruments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
10 percent decrease in stock price volatility, fair value | $ 131,700,000 |  |
10 percent increase in stock price volatility, fair value | 165,600,000 |  |
Capped Call |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
10 percent decrease in stock price volatility, fair value | 88,900,000 |  |
10 percent increase in stock price volatility, fair value | $ 78,500,000 |  |
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 Derivative Financial Instruments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative liability, measurement input | 0.34 |  |
Measurement Input, Stock Price Volatility | Capped Call |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative liability, measurement input | 0.34 |  |

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