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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 (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 397.4	$ 370.6
Unrealized Gain	0.0	0.0
Unrealized Loss	(2.7)	(0.1)
Fair Value	394.7	370.5
Short-term investments | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	163.7	128.2
Unrealized Gain	0.0	0.0
Unrealized Loss	(1.1)	(0.1)
Fair Value	162.6	128.1
Short-term investments | Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	134.6	37.6
Unrealized Gain	0.0	0.0
Unrealized Loss	(1.2)	0.0
Fair Value	133.4	37.6
Short-term investments | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	99.1	204.8
Unrealized Gain	0.0	0.0
Unrealized Loss	(0.4)	0.0
Fair Value	98.7	204.8
Long-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	551.1	563.2
Unrealized Gain	0.0	0.0
Unrealized Loss	(10.1)	(2.5)
Fair Value	541.0	560.7
Long-term investments | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	341.8	358.9
Unrealized Gain	0.0	0.0
Unrealized Loss	(5.2)	(1.5)
Fair Value	336.6	357.4
Long-term investments | Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	209.3	204.3
Unrealized Gain	0.0	0.0
Unrealized Loss	(4.9)	(1.0)
Fair Value	$ 204.4	$ 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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