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CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues:    
Total revenues $ 572.6 $ 515.3
Operating expenses:    
Cost of revenues 9.2 7.5
Research and development 263.2 159.4
Acquired in-process research and development 0.1 6.0
Selling, general, and administrative 276.5 243.1
Total operating expenses 549.0 416.0
Operating income 23.6 99.3
Other (expense) income:    
Unrealized (loss) gain on equity investments (30.6) 1.6
Charges associated with convertible senior notes 0.0 (88.7)
Investment income and other, net 21.7 22.3
Total other expense, net (8.9) (64.8)
Income before provision for income taxes 14.7 34.5
Provision for (Benefit from) income taxes 6.8 (8.9)
Net income 7.9 43.4
Foreign currency translation adjustments, net of tax 1.5 (0.5)
Unrealized gain (loss) on available-for-sale debt securities, net of tax 1.7 (3.2)
Comprehensive income $ 11.1 $ 39.7
Earnings per share:    
Basic (in USD per share) $ 0.08 $ 0.43
Diluted (in USD per share) $ 0.08 $ 0.42
Weighted-average shares outstanding:    
Basic (in shares) 99.7 99.8
Diluted (in shares) 102.5 103.6
Net product sales    
Revenues:    
Total revenues $ 563.7 $ 509.0
Collaboration revenues    
Revenues:    
Total revenues $ 8.9 $ 6.3