Marketable Securities - Schedule of Fair Value and Unrealized Losses of Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	$ 9,134.0	$ 6,516.3
Unrealized Loss - Less than 12 months	(263.1)	(42.3)
Fair Value - 12 Months or Greater	281.1	0.0
Unrealized Loss - 12 Months or Greater	(19.3)	0.0
Fair Value - Total	9,415.1	6,516.3
Unrealized Loss - Total	(282.4)	(42.3)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	7,139.8	5,889.3
Unrealized Loss - Less than 12 months	(251.8)	(40.9)
Fair Value - 12 Months or Greater	279.9	0.0
Unrealized Loss - 12 Months or Greater	(19.2)	0.0
Fair Value - Total	7,419.7	5,889.3
Unrealized Loss - Total	(271.0)	(40.9)
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	1,005.1	90.0
Unrealized Loss - Less than 12 months	(5.7)	(0.8)
Fair Value - 12 Months or Greater	1.2	0.0
Unrealized Loss - 12 Months or Greater	(0.1)	0.0
Fair Value - Total	1,006.3	90.0
Unrealized Loss - Total	(5.8)	(0.8)
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	44.2	37.0
Unrealized Loss - Less than 12 months	(1.8)	(0.3)
Fair Value - 12 Months or Greater	0.0	0.0
Unrealized Loss - 12 Months or Greater	0.0	0.0
Fair Value - Total	44.2	37.0
Unrealized Loss - Total	(1.8)	(0.3)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	620.0	295.7
Unrealized Loss - Less than 12 months	(1.4)	(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	620.0	295.7
Unrealized Loss - Total	(1.4)	(0.1)
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	285.4	169.4
Unrealized Loss - Less than 12 months	(0.9)	(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	285.4	169.4
Unrealized Loss - Total	(0.9)	(0.1)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	39.5	34.9
Unrealized Loss - Less than 12 months	(1.5)	(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	39.5	34.9
Unrealized Loss - Total	$ (1.5)	$ (0.1)