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Cash, Cash Equivalents and Short-Term Investments - Schedule of Components (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	$ 445.5	$ 533.0
Cash equivalents	445.5	533.0
Short-term investments, amortized cost	1,083.1	1,193.8
Short-term investments, unrealized gain	0.0	0.5
Short-term investments, unrealized loss	(33.0)	(9.2)
Short-term investments, estimated fair value	1,050.1	1,185.1
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments	1,528.6	1,726.8
Total cash, cash equivalents, and short term investments	1,495.6	1,718.1
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	531.7	607.4
Short-term investments, unrealized gain	0.0	0.4
Short-term investments, unrealized loss	(15.6)	(4.0)
Short-term investments, estimated fair value	516.1	603.8
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	264.6	240.4
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(9.2)	(2.9)
Short-term investments, estimated fair value	255.4	237.5
Asset backed securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	138.7	140.7
Short-term investments, unrealized gain	0.0	0.1
Short-term investments, unrealized loss	(4.4)	(1.2)
Short-term investments, estimated fair value	134.3	139.6
Municipal securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	68.7	70.5
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(2.8)	(0.7)
Short-term investments, estimated fair value	65.9	69.8
Commercial paper
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	24.4	61.7
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	24.4	61.7
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	19.0	32.1
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	19.0	32.1
U.S. agency obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	14.5	14.6
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.5)	(0.2)
Short-term investments, estimated fair value	14.0	14.4
Foreign government obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	13.5	18.4
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.3)	(0.1)
Short-term investments, estimated fair value	13.2	18.3
Supranational securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	8.0	8.0
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.2)	(0.1)
Short-term investments, estimated fair value	7.8	7.9
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	85.8	142.7
Cash equivalents	85.8	142.7
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	349.7	390.3
Cash equivalents	349.7	$ 390.3
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, at carrying value	10.0
Cash equivalents	$ 10.0

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