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Debt - Summary of Conversion Features (Details)
shares in Millions
 1 Months Ended 3 Months Ended
Jun. 30, 2020
USD ($)
shares
May 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
day
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]          
If-converted value in excess of principal       $ 1,000  
Gain (loss) on settlement of debt $ (21,500,000)     (26,800,000) $ (1,900,000)
Shares issued to settle convertible debt       $ 651,500,000  
2017 Senior Convertible Debt          
Debt Instrument [Line Items]          
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years)       6 years 7 months 6 days  
Extinguishment of debt, principal amount 643,900,000        
2017 Senior Convertible Debt | Long-term Debt          
Debt Instrument [Line Items]          
Extinguishment of debt, amount $ 643,900,000        
Shares issued to settle convertible debt (in shares) | shares 2.5        
Shares issued to settle convertible debt $ 246,400,000        
Total consideration, extinguishment of debt 890,300,000        
Total consideration, extinguishment of debt, liability component 481,000,000.0        
Total consideration, extinguishment of debt, equity component 390,900,000        
2015 Senior Convertible Debt          
Debt Instrument [Line Items]          
Threshold percentage of stock price trigger       130.00%  
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years)       4 years 7 months 6 days  
Extinguishment of debt, principal amount 383,300,000   $ 615,000,000.0    
2015 Senior Convertible Debt | Long-term Debt          
Debt Instrument [Line Items]          
Extinguishment of debt, amount $ 383,300,000   $ 615,000,000.0    
Shares issued to settle convertible debt (in shares) | shares 4.1   5.2    
Shares issued to settle convertible debt $ 405,100,000   $ 351,800,000    
Total consideration, extinguishment of debt 788,400,000   $ 966,800,000    
Total consideration, extinguishment of debt, liability component 314,400,000        
Total consideration, extinguishment of debt, equity component $ 464,400,000        
2017 Junior Convertible Debt          
Debt Instrument [Line Items]          
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years)       16 years 7 months 6 days  
Convertible Debt          
Debt Instrument [Line Items]          
Debt instrument, redemption price (percent)       100.00%  
Convertible Debt | Debt Instrument, Redemption, Period One          
Debt Instrument [Line Items]          
Threshold percentage of stock price trigger       130.00%  
Threshold trading days | day       20  
Threshold consecutive trading days | day       30  
Convertible Debt | Debt Instrument, Redemption, Period Two          
Debt Instrument [Line Items]          
Threshold percentage of stock price trigger       98.00%  
Threshold trading days | day       5  
Threshold consecutive trading days | day       10  
Senior Indebtedness | 2017 Senior Convertible Debt          
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 643,900,000      
Senior Indebtedness | 2015 Senior Convertible Debt          
Debt Instrument [Line Items]          
Extinguishment of debt, amount   383,300,000      
Bridge Loan Facility          
Debt Instrument [Line Items]          
Extinguishment of debt, amount   $ 615,000,000.0      
Secured bridge agreement term   364 days 364 days    
Gain (loss) on settlement of debt   $ (5,300,000)