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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Aug. 31, 2020
Sep. 30, 2020
May 31, 2020
Senior Unsecured Notes      
Line of Credit Facility [Line Items]      
Redemption price, percentage 100.00%    
Redemption price with change-in-control provision, percentage 101.00%    
Interest expense   $ 6,400,000  
Bridge Facility | Common Stock Held By Sanofi | Bridge Facility      
Line of Credit Facility [Line Items]      
Debt, principal amount     $ 1,500,000,000
2030 Notes | Senior Unsecured Notes      
Line of Credit Facility [Line Items]      
Debt, principal amount $ 1,250,000,000    
Interest rate 1.75%    
2050 Notes | Senior Unsecured Notes      
Line of Credit Facility [Line Items]      
Debt, principal amount $ 750,000,000    
Interest rate 2.80%