Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions		Jun. 30, 2022 USD ($) Security	Dec. 31, 2021 USD ($) Security
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities			$ 134.6
Number of Marketable Debt Securities in a Loss Position | Security			187
Unrealized Losses	[1]		$ 0.4
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months		$ 138.0
Unrealized Losses Less Than 12 Months		$ 2.3
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security		206
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 1.3
Unrealized Losses 12 Months Or Longer	[2]	$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		2
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities			$ 106.9
Number of Marketable Debt Securities in a Loss Position | Security			153
Unrealized Losses	[1]		$ 0.3
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months		$ 112.7
Unrealized Losses Less Than 12 Months		$ 1.9
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security		176
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 0.3
Unrealized Losses 12 Months Or Longer	[2]	$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		1
U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities			$ 4.8
Number of Marketable Debt Securities in a Loss Position | Security			6
Unrealized Losses	[1]		$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months		$ 4.0
Unrealized Losses Less Than 12 Months		$ 0.0
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security		6
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 0.0
Unrealized Losses 12 Months Or Longer	[2]	$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		0
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		$ 20.8
Unrealized Losses Less Than 12 Months		$ 0.4
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security		23
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 1.0
Unrealized Losses 12 Months Or Longer	[2]	$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		1
U.S. Treasury Securities | U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities			$ 22.4
Number of Marketable Debt Securities in a Loss Position | Security			27
Unrealized Losses	[1]		$ 0.1
Certificates of Deposit
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities			$ 0.5
Number of Marketable Debt Securities in a Loss Position | Security			1
Unrealized Losses	[1]		$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months		$ 0.5
Unrealized Losses Less Than 12 Months		$ 0.0
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security		1
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 0.0
Unrealized Losses 12 Months Or Longer	[2]	$ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		0

[1] For the period ended December 31, 2021, there were no debt securities in a continuous loss position greater than or equal to 12 months.

[2] Unrealized losses were insignificant for debt securities in a continuous loss position greater than or equal to 12 months for the period ended June 30, 2022.