Marketable Securities - Schedule of Investments in Available For Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 14,892.6	$ 12,636.0
Unrealized Gains	100.8	13.7
Unrealized Losses	(26.0)	(115.8)
Fair Value	14,967.4	12,533.9
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	7,708.2	6,492.5
Unrealized Gains	83.5	10.4
Unrealized Losses	(24.4)	(104.9)
Fair Value	7,767.3	6,398.0
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	5,985.8	4,839.6
Unrealized Gains	14.1	2.4
Unrealized Losses	(1.3)	(8.6)
Fair Value	5,998.6	4,833.4
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	66.7	58.1
Unrealized Gains	0.4	0.0
Unrealized Losses	(0.2)	(0.9)
Fair Value	66.9	57.2
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	556.6	636.8
Unrealized Gains	1.0	0.2
Unrealized Losses	0.0	(0.2)
Fair Value	557.6	636.8
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	402.1	520.8
Unrealized Gains	1.0	0.6
Unrealized Losses	0.0	0.0
Fair Value	403.1	521.4
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	173.2	88.2
Unrealized Gains	0.8	0.1
Unrealized Losses	(0.1)	(1.2)
Fair Value	$ 173.9	$ 87.1

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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