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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	Sep. 30, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	$ 517.6	$ 614.9
Cash and cash equivalents, estimated fair value	517.6	614.9
Short-term investments, amortized cost	380.8	761.8
Short-term investments, unrealized gain	0.9	0.6
Short-term investments, unrealized loss	(8.5)	(21.3)
Short-term investments, estimated fair value	373.2	741.1
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments	898.4	1,376.7
Total cash, cash equivalents, and short term investments	890.8	1,356.0
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	186.0	359.6
Short-term investments, unrealized gain	0.6	0.4
Short-term investments, unrealized loss	(4.1)	(10.3)
Short-term investments, estimated fair value	182.5	349.7
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	120.3	231.2
Short-term investments, unrealized gain	0.3	0.2
Short-term investments, unrealized loss	(2.8)	(6.1)
Short-term investments, estimated fair value	117.8	225.3
Asset backed securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	36.6	72.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.6)	(2.3)
Short-term investments, estimated fair value	36.0	70.0
Municipal securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	32.3	48.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.7)	(2.0)
Short-term investments, estimated fair value	31.6	46.3
Commercial paper
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost		30.7
Short-term investments, unrealized gain		0.0
Short-term investments, unrealized loss		0.0
Short-term investments, estimated fair value		30.7
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost		8.4
Short-term investments, unrealized gain		0.0
Short-term investments, unrealized loss		0.0
Short-term investments, estimated fair value		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	(0.2)	(0.3)
Short-term investments, estimated fair value	3.6	5.7
Foreign government obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost		3.5
Short-term investments, unrealized gain		0.0
Short-term investments, unrealized loss		(0.2)
Short-term investments, estimated fair value		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	98.8	81.3
Cash and cash equivalents, estimated fair value	98.8	81.3
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	418.8	514.8
Cash and cash equivalents, estimated fair value	$ 418.8	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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