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Debt Securities - Amortized Cost, Gross Unrealized Gain (Loss) Positions and Estimated Fair Value for Available-For-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	$ 370.6	$ 612.4
Unrealized Gain	0.0	1.5
Unrealized Loss	(0.1)	0.0
Fair Value	370.5	613.9
Short-term investments | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	128.2	299.3
Unrealized Gain	0.0	1.4
Unrealized Loss	(0.1)	0.0
Fair Value	128.1	300.7
Short-term investments | Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	37.6	230.9
Unrealized Gain	0.0	0.1
Unrealized Loss	0.0	0.0
Fair Value	37.6	231.0
Short-term investments | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	204.8	82.2
Unrealized Gain	0.0	0.0
Unrealized Loss	0.0	0.0
Fair Value	204.8	82.2
Long-term investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	563.2	226.7
Unrealized Gain	0.0	0.5
Unrealized Loss	(2.5)	(0.1)
Fair Value	560.7	227.1
Long-term investments | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	358.9	144.8
Unrealized Gain	0.0	0.4
Unrealized Loss	(1.5)	0.0
Fair Value	357.4	145.2
Long-term investments | Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	204.3	81.9
Unrealized Gain	0.0	0.1
Unrealized Loss	(1.0)	(0.1)
Fair Value	$ 203.3	$ 81.9

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- 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).

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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).

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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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