Marketable Securities - Schedule of Investments in Available For Sale Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 14,212.7	$ 12,636.0
Unrealized Gains	7.0	13.7
Unrealized Losses	(104.7)	(115.8)
Fair Value	14,115.0	12,533.9
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	7,478.9	6,492.5
Unrealized Gains	6.1	10.4
Unrealized Losses	(83.9)	(104.9)
Fair Value	7,401.1	6,398.0
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	5,291.2	4,839.6
Unrealized Gains	0.4	2.4
Unrealized Losses	(18.2)	(8.6)
Fair Value	5,273.4	4,833.4
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	59.8	58.1
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.8)	(0.9)
Fair Value	59.0	57.2
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	867.1	636.8
Unrealized Gains	0.3	0.2
Unrealized Losses	(0.5)	(0.2)
Fair Value	866.9	636.8
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	389.7	520.8
Unrealized Gains	0.2	0.6
Unrealized Losses	0.0	0.0
Fair Value	389.9	521.4
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	126.0	88.2
Unrealized Gains	0.0	0.1
Unrealized Losses	(1.3)	(1.2)
Fair Value	$ 124.7	$ 87.1