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Marketable Securities - Schedule of Fair Value and Unrealized Losses of Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	$ 6,463.2	$ 6,516.3
Unrealized Loss - Less than 12 months	(233.4)	(42.3)
Fair Value - 12 Months or Greater	1,604.1	0.0
Unrealized Loss - 12 Months or Greater	(113.4)	0.0
Fair Value - Total	8,067.3	6,516.3
Unrealized Loss - Total	(346.8)	(42.3)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	5,360.5	5,889.3
Unrealized Loss - Less than 12 months	(224.8)	(40.9)
Fair Value - 12 Months or Greater	1,561.9	0.0
Unrealized Loss - 12 Months or Greater	(109.5)	0.0
Fair Value - Total	6,922.4	5,889.3
Unrealized Loss - Total	(334.3)	(40.9)
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	249.3	90.0
Unrealized Loss - Less than 12 months	(4.8)	(0.8)
Fair Value - 12 Months or Greater	20.9	0.0
Unrealized Loss - 12 Months or Greater	(2.4)	0.0
Fair Value - Total	270.2	90.0
Unrealized Loss - Total	(7.2)	(0.8)
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	27.5	37.0
Unrealized Loss - Less than 12 months	(1.4)	(0.3)
Fair Value - 12 Months or Greater	15.8	0.0
Unrealized Loss - 12 Months or Greater	(1.0)	0.0
Fair Value - Total	43.3	37.0
Unrealized Loss - Total	(2.4)	(0.3)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	591.0	295.7
Unrealized Loss - Less than 12 months	(0.6)	(0.1)
Fair Value - 12 Months or Greater	0.0	0.0
Unrealized Loss - 12 Months or Greater	0.0	0.0
Fair Value - Total	591.0	295.7
Unrealized Loss - Total	(0.6)	(0.1)
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	214.9	169.4
Unrealized Loss - Less than 12 months	(0.4)	(0.1)
Fair Value - 12 Months or Greater	0.0	0.0
Unrealized Loss - 12 Months or Greater	0.0	0.0
Fair Value - Total	214.9	169.4
Unrealized Loss - Total	(0.4)	(0.1)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	20.0	34.9
Unrealized Loss - Less than 12 months	(1.4)	(0.1)
Fair Value - 12 Months or Greater	5.5	0.0
Unrealized Loss - 12 Months or Greater	(0.5)	0.0
Fair Value - Total	25.5	34.9
Unrealized Loss - Total	$ (1.9)	$ (0.1)

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