Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions	Dec. 31, 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	$ 47.8	$ 94.7
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security	60	132
Unrealized Losses Less Than 12 Months	$ 0.1	$ 1.2
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer	$ 43.9	$ 48.5
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security	61	66
Unrealized Losses 12 Months Or Longer	$ 0.4	$ 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	$ 27.9	$ 77.0
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security	35	113
Unrealized Losses Less Than 12 Months	$ 0.1	$ 1.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer	$ 36.2	$ 37.9
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security	49	50
Unrealized Losses 12 Months Or Longer	$ 0.3	$ 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	$ 11.4	$ 14.5
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security	11	14
Unrealized Losses Less Than 12 Months	$ 0.0	$ 0.2
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer	$ 6.2	$ 9.3
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security	10	13
Unrealized Losses 12 Months Or Longer	$ 0.1	$ 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	$ 8.5	$ 3.2
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security	14	5
Unrealized Losses Less Than 12 Months	$ 0.0	$ 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