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Marketable Securities and Fair Value Measurements - Summary of Available-for-Sale Marketable Securities (Details) - Level 2 - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$ 1,272.0	$ 1,398.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(22.0)	(4.6)
Fair Value	1,250.0	1,394.3
Corporate Bonds Maturing 2022-2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	824.5
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(8.0)
Fair Value	816.5
Corporate Bonds Maturing 2023-2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	363.3
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(13.0)
Fair Value	350.3
Corporate Bonds Maturing 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost		784.0
Gross Unrealized Gains		0.0
Gross Unrealized Losses		(0.7)
Fair Value		783.3
Corporate Bonds Maturing 2023-2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost		582.5
Gross Unrealized Gains		0.0
Gross Unrealized Losses		(3.8)
Fair Value		578.7
Government Securities Maturing 2022-2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	79.9
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(0.8)
Fair Value	79.1
Government Securities Maturing 2023-2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	4.3
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(0.2)
Fair Value	$ 4.1
Government Securities Maturing 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost		32.4
Gross Unrealized Gains		0.0
Gross Unrealized Losses		(0.1)
Fair Value		$ 32.3

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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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