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Cash, Cash Equivalents and Short-Term Investments - Schedule of Components (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	$ 614.9	$ 232.8
Cash equivalents	614.9	232.8
Short-term investments, amortized cost	761.8	1,158.5
Short-term investments, unrealized gain	0.6	0.3
Short-term investments, unrealized loss	(21.3)	(48.2)
Short-term investments, estimated fair value	741.1	1,110.6
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments	1,376.7	1,391.3
Total cash, cash equivalents, and short term investments	1,356.0	1,343.4
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	359.6	512.1
Short-term investments, unrealized gain	0.4	0.1
Short-term investments, unrealized loss	(10.3)	(22.7)
Short-term investments, estimated fair value	349.7	489.5
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	231.2	360.2
Short-term investments, unrealized gain	0.2	0.2
Short-term investments, unrealized loss	(6.1)	(14.0)
Short-term investments, estimated fair value	225.3	346.4
Asset backed securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	72.3	117.6
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(2.3)	(6.0)
Short-term investments, estimated fair value	70.0	111.6
Municipal securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	48.3	65.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(2.0)	(4.1)
Short-term investments, estimated fair value	46.3	61.2
Commercial paper
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	30.7	46.4
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	30.7	46.4
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	8.4	29.1
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	8.4	29.1
U.S. agency obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	6.0	18.4
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.3)	(0.8)
Short-term investments, estimated fair value	5.7	17.6
Foreign government obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	3.5	6.0
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.2)	(0.4)
Short-term investments, estimated fair value	3.3	5.6
Supranational securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	1.8	3.4
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.1)	(0.2)
Short-term investments, estimated fair value	1.7	3.2
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	81.3	90.1
Cash equivalents	81.3	90.1
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	514.8	139.5
Cash equivalents	514.8	139.5
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	10.0
Cash equivalents	10.0
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	4.4	3.2
Cash equivalents	4.4	$ 3.2
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	2.9
Cash equivalents	2.9
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	1.3
Cash equivalents	1.3
Municipal securities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	0.2
Cash equivalents	$ 0.2

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