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Cash, Cash Equivalents and Short-Term Investments - Schedule of Amortized Cost, Unrealized Gains and Losses and Estimated Fair Value of Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	$ 548.9	$ 614.9
Cash and cash equivalents, estimated fair value	548.9	614.9
Short-term investments, amortized cost	645.5	761.8
Short-term investments, unrealized gain	0.2	0.6
Short-term investments, unrealized loss	(18.7)	(21.3)
Short-term investments, estimated fair value	627.0	741.1
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments	1,194.4	1,376.7
Total cash, cash equivalents, and short term investments	1,175.9	1,356.0
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	337.0	359.6
Short-term investments, unrealized gain	0.2	0.4
Short-term investments, unrealized loss	(9.1)	(10.3)
Short-term investments, estimated fair value	328.1	349.7
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	163.4	231.2
Short-term investments, unrealized gain	0.0	0.2
Short-term investments, unrealized loss	(5.6)	(6.1)
Short-term investments, estimated fair value	157.8	225.3
Asset backed securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	61.0	72.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(1.8)	(2.3)
Short-term investments, estimated fair value	59.2	70.0
Municipal securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	42.8	48.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(1.7)	(2.0)
Short-term investments, estimated fair value	41.1	46.3
Commercial paper
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	27.0	30.7
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	27.0	30.7
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	6.7	8.4
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	6.7	8.4
U.S. agency obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	3.8	6.0
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.3)	(0.3)
Short-term investments, estimated fair value	3.5	5.7
Foreign government obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	2.0	3.5
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.1)	(0.2)
Short-term investments, estimated fair value	1.9	3.3
Supranational securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	1.8	1.8
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.1)	(0.1)
Short-term investments, estimated fair value	1.7	1.7
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	109.7	81.3
Cash and cash equivalents, estimated fair value	109.7	81.3
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	439.2	514.8
Cash and cash equivalents, estimated fair value	$ 439.2	514.8
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost		10.0
Cash and cash equivalents, estimated fair value		10.0
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost		4.4
Cash and cash equivalents, estimated fair value		4.4
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost		2.9
Cash and cash equivalents, estimated fair value		2.9
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost		1.3
Cash and cash equivalents, estimated fair value		1.3
Municipal securities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost		0.2
Cash and cash equivalents, estimated fair value		$ 0.2

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