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Convertible Senior Notes - Due 2027 - Terms (Details)
$ / shares in Units, shares in Millions
6 Months Ended
May 19, 2020
USD ($)
D
$ / shares
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Convertible Senior Notes      
Net proceeds from offering | $   $ 1,000,000,000 $ 0
Offering costs | $   24,070,000 $ 0
2027 Notes      
Convertible Senior Notes      
Face amount | $ $ 1,000,000,000 $ 1,000,000,000  
Interest rate (as a percent) 1.25%    
Net proceeds from offering | $ $ 975,900,000    
Offering costs | $ 24,100,000    
Principal multiple amount used in the conversion of the debt instrument | $ $ 1,000    
Minimum percentage of common stock price as a percentage of the conversion price 130.00%    
Convertible debt, threshold, trading days | D 20    
Convertible debt, threshold, consecutive trading days | D 30    
Convertible debt, number of business days, measurement period | D 5    
Convertible debt, number of consecutive trading days, measurement period | D 10    
Trading price expressed as a percentage of the last reported sales price and conversion rate after the specified consecutive trading day period 98.00%    
Convertible debt, conversion rate 4.1258    
Convertible debt, conversion price (in dollars per share) | $ / shares $ 242.38    
Trading day observation period used to determine the amount of cash and shares, if any, that are due upon conversion | D 25    
Debt term 7 years    
Convertible debt, equity component | $ $ 286,000,000    
Shares reserved for issuance (in shares) | shares 5.4    
2027 Notes | On or after June 5, 2024      
Convertible Senior Notes      
Minimum percentage of common stock price as a percentage of the conversion price 130.00%    
Convertible debt, threshold, trading days | D 20    
Convertible debt, threshold, consecutive trading days | D 30