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Marketable Securities - Schedule of Investments in Available For Sale Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 13,261.6	$ 14,338.0
Unrealized Gains	57.0	30.1
Unrealized Losses	(17.7)	(39.0)
Fair Value	13,300.9	14,329.1
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	8,540.9	8,226.9
Unrealized Gains	49.8	25.1
Unrealized Losses	(15.1)	(31.4)
Fair Value	8,575.6	8,220.6
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	3,531.8	4,820.5
Unrealized Gains	5.7	3.4
Unrealized Losses	(2.3)	(6.9)
Fair Value	3,535.2	4,817.0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	393.6	548.3
Unrealized Gains	0.2	0.4
Unrealized Losses	0.0	0.0
Fair Value	393.8	548.7
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	414.1	380.6
Unrealized Gains	0.3	0.5
Unrealized Losses	0.0	0.0
Fair Value	414.4	381.1
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	321.2	279.0
Unrealized Gains	0.7	0.6
Unrealized Losses	(0.2)	(0.3)
Fair Value	321.7	279.3
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	60.0	82.7
Unrealized Gains	0.3	0.1
Unrealized Losses	(0.1)	(0.4)
Fair Value	$ 60.2	$ 82.4

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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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