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Debt Securities - Amortized Cost, Gross Unrealized Gains and Losses, Allowance for Credit Losses and Fair Value of Debt Securities Available-For-Sale (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	$ 595.6	$ 370.6
Unrealized gain, current	0.0	0.0
Unrealized loss, current	(8.4)	(0.1)
Fair value, current	587.2	370.5
Amortized cost, noncurrent	373.1	563.2
Unrealized gain, noncurrent	0.0	0.0
Unrealized loss, noncurrent	(10.5)	(2.5)
Fair value, noncurrent	362.6	560.7
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	97.9	204.8
Unrealized gain, current	0.0	0.0
Unrealized loss, current	(0.4)	0.0
Fair value, current	97.5	204.8
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	260.5	128.2
Unrealized gain, current	0.0	0.0
Unrealized loss, current	(3.2)	(0.1)
Fair value, current	257.3	128.1
Amortized cost, noncurrent	270.8	358.9
Unrealized gain, noncurrent	0.0	0.0
Unrealized loss, noncurrent	(6.2)	(1.5)
Fair value, noncurrent	264.6	357.4
Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	237.2	37.6
Unrealized gain, current	0.0	0.0
Unrealized loss, current	(4.8)	0.0
Fair value, current	232.4	37.6
Amortized cost, noncurrent	102.3	204.3
Unrealized gain, noncurrent	0.0	0.0
Unrealized loss, noncurrent	(4.3)	(1.0)
Fair value, noncurrent	$ 98.0	$ 203.3

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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