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Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenue $ 32.5 $ 26.5
Operating expenses:    
Research and development 95.3 64.0
General and administrative 24.9 20.2
Total operating expenses 120.2 84.2
Loss from operations (87.7) (57.7)
Other income (expenses)    
Other expense, net (1.1) (0.1)
Interest income, net 7.6 1.2
Total other income 6.5 1.1
Net loss before income taxes and loss from equity method investment (81.2) (56.6)
Income tax benefit (expense) 0.4 (4.5)
Loss from equity method investment (1.1) (2.3)
Net loss $ (81.9) $ (63.4)
Net loss per common share, basic (in dollars per share) $ (1.54) $ (1.20)
Net loss per common share, diluted (in dollars per share) $ (1.54) $ (1.20)
Weighted average common shares outstanding, basic (in shares) 53.3 53.0
Weighted average common shares outstanding, diluted (in shares) 53.3 53.0
Statement of Comprehensive Income [Abstract]    
Net loss $ (81.9) $ (63.4)
Other comprehensive loss:    
Unrealized gain (loss) on available-for-sale securities 6.6 (14.1)
Comprehensive loss $ (75.3) $ (77.5)