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Cash, Cash Equivalents and Short-Term Investments - Schedule of Components (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	$ 604.3	$ 232.8
Cash equivalents	604.3	232.8
Short-term investments, amortized cost	736.7	1,158.5
Short-term investments, unrealized gain	0.0	0.3
Short-term investments, unrealized loss	(32.1)	(48.2)
Short-term investments, estimated fair value	704.6	1,110.6
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments	1,341.0	1,391.3
Total cash, cash equivalents, and short term investments	1,308.9	1,343.4
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	313.5	512.1
Short-term investments, unrealized gain	0.0	0.1
Short-term investments, unrealized loss	(15.4)	(22.7)
Short-term investments, estimated fair value	298.1	489.5
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	242.5	360.2
Short-term investments, unrealized gain	0.0	0.2
Short-term investments, unrealized loss	(9.6)	(14.0)
Short-term investments, estimated fair value	232.9	346.4
Asset backed securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	79.2	117.6
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(3.4)	(6.0)
Short-term investments, estimated fair value	75.8	111.6
Municipal securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	54.2	65.3
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(2.9)	(4.1)
Short-term investments, estimated fair value	51.3	61.2
Commercial paper
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	19.8	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	19.8	46.4
U.S. agency obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	10.0	18.4
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.4)	(0.8)
Short-term investments, estimated fair value	9.6	17.6
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	9.8	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	9.8	29.1
Foreign government obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	5.9	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	5.7	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	(0.2)	(0.2)
Short-term investments, estimated fair value	1.6	3.2
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	85.2	90.1
Cash equivalents	85.2	90.1
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	500.6	139.5
Cash equivalents	500.6	139.5
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	14.7
Cash equivalents	14.7
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	2.7	3.2
Cash equivalents	2.7	$ 3.2
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	0.8
Cash equivalents	0.8
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	0.3
Cash equivalents	$ 0.3

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