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Condensed Consolidated Statements of Income and Comprehensive Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenues:    
Revenues $ 310.6 $ 236.6
Operating expenses:    
Cost of revenues 4.6 2.9
Research and development 102.2 73.2
Selling, general and administrative 200.7 129.0
Total operating expenses 307.5 205.1
Operating income 3.1 31.5
Other income (expense):    
Interest expense (2.6) (6.4)
Unrealized gain on equity securities 19.9 0.7
Investment income and other, net 1.0 1.4
Total other income (expense), net 18.3 (4.3)
Income before provision for (benefit from) income taxes 21.4 27.2
Provision for (benefit from) income taxes 7.5 (4.9)
Net income 13.9 32.1
Unrealized loss on debt securities available-for-sale, net of tax (7.6) (0.8)
Comprehensive income $ 6.3 $ 31.3
Earnings per share:    
Basic (in USD per share) $ 0.15 $ 0.34
Diluted (in USD per share) $ 0.14 $ 0.33
Weighted-average shares outstanding:    
Basic (in shares) 95.3 94.2
Diluted (in shares) 97.6 98.2
Net product sales    
Revenues:    
Revenues $ 305.0 $ 231.0
Collaboration revenues    
Revenues:    
Revenues $ 5.6 $ 5.6