Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions	Mar. 31, 2024 USD ($) Security	Dec. 31, 2023 USD ($) Security
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months	$ 84.0	$ 47.8
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security	92	60
Unrealized Losses Less Than 12 Months	$ 0.3	$ 0.1
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer	$ 25.8	$ 43.9
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security	40	61
Unrealized Losses 12 Months Or Longer	$ 0.1	$ 0.4
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	$ 54.5	$ 27.9
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security	61	35
Unrealized Losses Less Than 12 Months	$ 0.2	$ 0.1
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer	$ 18.8	$ 36.2
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security	30	49
Unrealized Losses 12 Months Or Longer	$ 0.1	$ 0.3
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	$ 21.6	$ 11.4
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security	20	11
Unrealized Losses Less Than 12 Months	$ 0.1	$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer	$ 4.8	$ 6.2
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security	7	10
Unrealized Losses 12 Months Or Longer	$ 0.0	$ 0.1
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	$ 5.4	$ 8.5
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security	8	14
Unrealized Losses Less Than 12 Months	$ 0.0	$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer	$ 2.2	$ 1.5
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security	3	2
Unrealized Losses 12 Months Or Longer	$ 0.0	$ 0.0
Certificates of Deposit
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months	$ 2.5
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security	3
Unrealized Losses Less Than 12 Months	$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer	$ 0.0
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security	0
Unrealized Losses 12 Months Or Longer	$ 0.0