Marketable Securities - Schedule of Investments in Available For Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 12,636.0	$ 10,320.1
Unrealized Gains	13.7	0.9
Unrealized Losses	(115.8)	(302.8)
Fair Value	12,533.9	10,018.2
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	6,492.5	6,975.5
Unrealized Gains	10.4	0.0
Unrealized Losses	(104.9)	(291.1)
Fair Value	6,398.0	6,684.4
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	4,839.6	2,945.4
Unrealized Gains	2.4	0.9
Unrealized Losses	(8.6)	(6.9)
Fair Value	4,833.4	2,939.4
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	58.1	67.1
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.9)	(3.0)
Fair Value	57.2	64.1
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	636.8	121.1
Unrealized Gains	0.2	0.0
Unrealized Losses	(0.2)	0.0
Fair Value	636.8	121.1
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	520.8	182.1
Unrealized Gains	0.6	0.0
Unrealized Losses	0.0	(0.1)
Fair Value	521.4	182.0
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	88.2	28.9
Unrealized Gains	0.1	0.0
Unrealized Losses	(1.2)	(1.7)
Fair Value	$ 87.1	$ 27.2