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Fair Value Measurements - Narrative (Details)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 17, 2020
USD ($)
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