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Equity - Schedule of Stock-based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense $ 11.4 $ 24.4 $ 21.9 $ 31.0
Cost of product sales and contract development and manufacturing services        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 2.0 8.1 3.7 8.8
Research and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 1.7 5.4 3.1 6.3
Selling, general and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense $ 7.7 $ 10.9 $ 15.1 $ 15.9