Marketable Securities - Schedule of Investments in Available For Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 12,843.5	$ 10,320.1
Unrealized Gains	0.9	0.9
Unrealized Losses	(224.0)	(302.8)
Fair Value	12,620.4	10,018.2
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	6,726.3	6,975.5
Unrealized Gains	0.4	0.0
Unrealized Losses	(189.1)	(291.1)
Fair Value	6,537.6	6,684.4
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	5,112.6	2,945.4
Unrealized Gains	0.2	0.9
Unrealized Losses	(30.5)	(6.9)
Fair Value	5,082.3	2,939.4
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	67.3	67.1
Unrealized Gains	0.0	0.0
Unrealized Losses	(1.7)	(3.0)
Fair Value	65.6	64.1
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	505.1	121.1
Unrealized Gains	0.2	0.0
Unrealized Losses	(0.2)	0.0
Fair Value	505.1	121.1
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	342.6	182.1
Unrealized Gains	0.1	0.0
Unrealized Losses	(0.1)	(0.1)
Fair Value	342.6	182.0
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	89.6	28.9
Unrealized Gains	0.0	0.0
Unrealized Losses	(2.4)	(1.7)
Fair Value	$ 87.2	$ 27.2