Marketable Securities - Schedule of Investments in Available For Sale Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 13,979.1	$ 14,338.0
Unrealized Gains	77.7	30.1
Unrealized Losses	(10.2)	(39.0)
Fair Value	14,046.6	14,329.1
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	8,901.5	8,226.9
Unrealized Gains	66.7	25.1
Unrealized Losses	(8.7)	(31.4)
Fair Value	8,959.5	8,220.6
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	3,656.2	4,820.5
Unrealized Gains	9.0	3.4
Unrealized Losses	(1.3)	(6.9)
Fair Value	3,663.9	4,817.0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	573.2	548.3
Unrealized Gains	0.1	0.4
Unrealized Losses	(0.1)	0.0
Fair Value	573.2	548.7
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	417.2	380.6
Unrealized Gains	0.2	0.5
Unrealized Losses	0.0	0.0
Fair Value	417.4	381.1
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	371.0	279.0
Unrealized Gains	1.3	0.6
Unrealized Losses	(0.1)	(0.3)
Fair Value	372.2	279.3
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	60.0	82.7
Unrealized Gains	0.4	0.1
Unrealized Losses	0.0	(0.4)
Fair Value	$ 60.4	$ 82.4

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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