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Subsequent Events (Narrative) (Details) - Subsequent Event [Member]
Feb. 09, 2021
USD ($)
item
$ / shares
shares
Jan. 12, 2021
Development program term   60 months
Notes [Member]    
Principal amount of notes $ 900,000,000  
Debt instrument, stated interest rate 1.50%  
Maturity date Feb. 15, 2028  
Shares issued conversion rate per $1,000 principal amount | shares 22.9885  
Principal amount for conversion rate $ 1,000  
Conversion price per share | $ / shares $ 43.50  
Threshold number of trading days for conversion 20 days  
Threshold number of consecutive trading days for conversion 30 days  
Threshold percentage for conversion 150.00%  
Redemption price, percentage 100.00%  
Investment Agreement [Member] | Standstill Obligations [Member]    
Covenant, anniversary period from closing date 3 years  
Covenant, number of days no member of purchaser may beneficially own any Notes of the Company 90 days  
Covenant, number of members of purchaser that may beneficially own any notes of the Company | item 0  
Covenant, maximum collective ownership aggregate percentage permitted 19.99%  
Covenant, maximum benefical ownership permitted 10.00%  
Investment Agreement [Member] | Transfer Restrictions; Registration Rights [Member]    
Covenant, anniversary period from closing date 1 year