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Marketable Securities - Schedule of Fair Value and Unrealized Losses of Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	$ 2,932.9
Unrealized Loss - Less than 12 months	(7.0)
Fair Value - 12 Months or Greater	0.0
Unrealized Loss - 12 Months or Greater	0.0
Fair Value - Total	2,932.9
Unrealized Loss - Total	(7.0)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	2,905.9	$ 364.5
Unrealized Loss - Less than 12 months	(6.9)	(0.2)
Fair Value - 12 Months or Greater	0.0	0.0
Unrealized Loss - 12 Months or Greater	0.0	0.0
Fair Value - Total	2,905.9	364.5
Unrealized Loss - Total	(6.9)	$ (0.2)
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	27.0
Unrealized Loss - Less than 12 months	(0.1)
Fair Value - 12 Months or Greater	0.0
Unrealized Loss - 12 Months or Greater	0.0
Fair Value - Total	27.0
Unrealized Loss - Total	$ (0.1)

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