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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	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	$ 1,328.3	$ 614.9	$ 232.8
Cash and cash equivalents, estimated fair value	1,328.3	614.9
Short-term investments, amortized cost	272.9	761.8
Short-term investments, unrealized gain	0.2	0.6
Short-term investments, unrealized loss	(7.2)	(21.3)
Short-term investments, estimated fair value	265.9	741.1
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments	1,601.2	1,376.7
Total cash, cash equivalents, and short term investments	1,594.2	1,356.0
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	133.1	359.6
Short-term investments, unrealized gain	0.2	0.4
Short-term investments, unrealized loss	(3.3)	(10.3)
Short-term investments, estimated fair value	130.0	349.7
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	85.0	231.2
Short-term investments, unrealized gain	0.0	0.2
Short-term investments, unrealized loss	(2.6)	(6.1)
Short-term investments, estimated fair value	82.4	225.3
Municipal securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	30.0	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	29.3	46.3
Asset backed securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	19.2	72.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.3)	(2.3)
Short-term investments, estimated fair value	18.9	70.0
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	98.3	81.3
Cash and cash equivalents, estimated fair value	98.3	81.3
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	1,230.0	514.8
Cash and cash equivalents, estimated fair value	$ 1,230.0	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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