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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	Jun. 30, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	$ 515.1	$ 614.9
Cash and cash equivalents, estimated fair value	515.1	614.9
Short-term investments, amortized cost	563.0	761.8
Short-term investments, unrealized gain	0.2	0.6
Short-term investments, unrealized loss	(15.8)	(21.3)
Short-term investments, estimated fair value	547.4	741.1
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments	1,078.1	1,376.7
Total cash, cash equivalents, and short term investments	1,062.5	1,356.0
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	300.9	359.6
Short-term investments, unrealized gain	0.2	0.4
Short-term investments, unrealized loss	(7.7)	(10.3)
Short-term investments, estimated fair value	293.4	349.7
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	145.7	231.2
Short-term investments, unrealized gain	0.0	0.2
Short-term investments, unrealized loss	(5.0)	(6.1)
Short-term investments, estimated fair value	140.7	225.3
Asset backed securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	50.9	72.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(1.2)	(2.3)
Short-term investments, estimated fair value	49.7	70.0
Municipal securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	37.9	48.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(1.4)	(2.0)
Short-term investments, estimated fair value	36.5	46.3
Commercial paper
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	14.6	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	14.6	30.7
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	5.4	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	5.4	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	101.0	81.3
Cash and cash equivalents, estimated fair value	101.0	81.3
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	411.3	514.8
Cash and cash equivalents, estimated fair value	411.3	514.8
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	2.7	2.9
Cash and cash equivalents, estimated fair value	2.7	2.9
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	0.1	10.0
Cash and cash equivalents, estimated fair value	$ 0.1	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
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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