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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Security
Dec. 31, 2022
USD ($)
Security
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 72.6 $ 94.7
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 86 132
Unrealized Losses Less Than 12 Months $ (0.5) $ (1.2)
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 60.3 $ 48.5
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 78 66
Unrealized Losses 12 Months Or Longer $ (0.9) $ (1.4)
Corporate Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 50.8 $ 77.0
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 58 113
Unrealized Losses Less Than 12 Months $ (0.3) $ (1.0)
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 45.7 $ 37.9
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 59 50
Unrealized Losses 12 Months Or Longer $ (0.7) $ (1.1)
U.S. Treasury Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 11.8 $ 14.5
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 12 14
Unrealized Losses Less Than 12 Months $ (0.1) $ (0.2)
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 13.1 $ 9.3
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 17 13
Unrealized Losses 12 Months Or Longer $ (0.2) $ (0.3)
U.S. Government Agency Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 10.0 $ 3.2
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 16 5
Unrealized Losses Less Than 12 Months $ (0.1) $ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 1.5 $ 1.3
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 2 3
Unrealized Losses 12 Months Or Longer $ 0.0 $ 0.0