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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions		Dec. 31, 2022 USD ($) Security	Dec. 31, 2021 USD ($) Security
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities in a Loss Position Less than 12 Months		$ 94.7
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security		132
Unrealized Losses Less Than 12 Months		$ 1.2
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 48.5
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		66
Unrealized Losses 12 Months Or Longer		$ 1.4
Fair Value of Marketable Debt Securities			$ 134.6
Number of Marketable Debt Securities in a Loss Position | Security			187
Unrealized Losses	[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		$ 77.0
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security		113
Unrealized Losses Less Than 12 Months		$ 1.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 37.9
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		50
Unrealized Losses 12 Months Or Longer		$ 1.1
Fair Value of Marketable Debt Securities			$ 106.9
Number of Marketable Debt Securities in a Loss Position | Security			153
Unrealized Losses	[1]		$ 0.3
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
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		$ 14.5
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security		14
Unrealized Losses Less Than 12 Months		$ 0.2
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 9.3
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		13
Unrealized Losses 12 Months Or Longer		$ 0.3
Fair Value of Marketable Debt Securities			$ 22.4
Number of Marketable Debt Securities in a Loss Position | Security			27
Unrealized Losses	[1]		$ 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		$ 3.2
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security		5
Unrealized Losses Less Than 12 Months
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer		$ 1.3
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security		3
Unrealized Losses 12 Months Or Longer
Fair Value of Marketable Debt Securities			$ 4.8
Number of Marketable Debt Securities in a Loss Position | Security			6
Unrealized Losses
[1] For the period ended December 31, 2021, there were no marketable debt securities in a continuous loss position greater than or equal to 12 months.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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