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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	Jun. 30, 2022	Dec. 31, 2021
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 491.3	$ 370.6
Unrealized Gain	0.0	0.0
Unrealized Loss	(6.3)	(0.1)
Fair Value	485.0	370.5
Short-term investments | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	213.3	128.2
Unrealized Gain	0.0	0.0
Unrealized Loss	(2.7)	(0.1)
Fair Value	210.6	128.1
Short-term investments | Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	199.8	37.6
Unrealized Gain	0.0	0.0
Unrealized Loss	(3.2)	0.0
Fair Value	196.6	37.6
Short-term investments | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	78.2	204.8
Unrealized Gain	0.0	0.0
Unrealized Loss	(0.4)	0.0
Fair Value	77.8	204.8
Long-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	415.5	563.2
Unrealized Gain	0.0	0.0
Unrealized Loss	(10.3)	(2.5)
Fair Value	405.2	560.7
Long-term investments | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	266.8	358.9
Unrealized Gain	0.0	0.0
Unrealized Loss	(5.6)	(1.5)
Fair Value	261.2	357.4
Long-term investments | Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	148.7	204.3
Unrealized Gain	0.0	0.0
Unrealized Loss	(4.7)	(1.0)
Fair Value	$ 144.0	$ 203.3

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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

+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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