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Condensed Consolidated Statements of Income and Comprehensive Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues:    
Revenues $ 236.6 $ 237.1
Operating expenses:    
Cost of sales 2.9 2.1
Research and development 73.2 58.3
Selling, general and administrative 129.0 117.8
Total operating expenses 205.1 178.2
Operating income 31.5 58.9
Other (expense) income:    
Interest expense (6.4) (8.2)
Unrealized gain (loss) on restricted equity securities 0.7 (16.5)
Investment income and other, net 1.4 4.7
Total other expense, net (4.3) (20.0)
Income before (benefit from) provision for income taxes 27.2 38.9
(Benefit from) provision for income taxes (4.9) 1.5
Net income 32.1 37.4
Unrealized loss on debt securities available-for-sale, net of tax (0.8) (2.8)
Comprehensive income $ 31.3 $ 34.6
Net income per share, basic (in USD per share) $ 0.34 $ 0.40
Net income per share, diluted (in USD per share) $ 0.33 $ 0.39
Weighted average common shares outstanding, basic (in shares) 94.2 92.6
Weighted average common shares outstanding, diluted (in shares) 98.2 97.0
Product sales, net    
Revenues:    
Revenues $ 231.0 $ 231.1
Collaboration revenue    
Revenues:    
Revenues $ 5.6 $ 6.0