Marketable Securities - Schedule of Fair Value and Unrealized Losses of Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	$ 1,222.7	$ 3,300.9
Unrealized Loss - Less than 12 months	(8.4)	(76.9)
Fair Value - 12 Months or Greater	5,464.5	4,332.2
Unrealized Loss - 12 Months or Greater	(231.7)	(225.9)
Fair Value - Total	6,687.2	7,633.1
Unrealized Loss - Total	(240.1)	(302.8)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	707.1	2,445.4
Unrealized Loss - Less than 12 months	(8.1)	(73.1)
Fair Value - 12 Months or Greater	5,293.7	4,200.4
Unrealized Loss - 12 Months or Greater	(223.6)	(218.0)
Fair Value - Total	6,000.8	6,645.8
Unrealized Loss - Total	(231.7)	(291.1)
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	228.1	785.2
Unrealized Loss - Less than 12 months	(0.1)	(2.0)
Fair Value - 12 Months or Greater	79.2	71.0
Unrealized Loss - 12 Months or Greater	(4.2)	(4.9)
Fair Value - Total	307.3	856.2
Unrealized Loss - Total	(4.3)	(6.9)
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	0.0	18.6
Unrealized Loss - Less than 12 months	0.0	(1.1)
Fair Value - 12 Months or Greater	64.0	45.6
Unrealized Loss - 12 Months or Greater	(2.3)	(1.9)
Fair Value - Total	64.0	64.2
Unrealized Loss - Total	(2.3)	(3.0)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	212.6
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	212.6
Unrealized Loss - Total	(0.1)
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	74.9	40.2
Unrealized Loss - Less than 12 months	(0.1)	(0.1)
Fair Value - 12 Months or Greater	2.9	0.0
Unrealized Loss - 12 Months or Greater	(0.1)	0.0
Fair Value - Total	77.8	40.2
Unrealized Loss - Total	(0.2)	(0.1)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less than 12 Months	0.0	11.5
Unrealized Loss - Less than 12 months	0.0	(0.6)
Fair Value - 12 Months or Greater	24.7	15.2
Unrealized Loss - 12 Months or Greater	(1.5)	(1.1)
Fair Value - Total	24.7	26.7
Unrealized Loss - Total	$ (1.5)	$ (1.7)