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Marketable Securities - Schedule of Investments in Available For Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 8,716.3	$ 8,428.7
Unrealized Gains	0.1	10.8
Unrealized Losses	(346.8)	(42.3)
Fair Value	8,369.6	8,397.2
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	7,299.0	7,518.4
Unrealized Gains	0.1	10.2
Unrealized Losses	(334.3)	(40.9)
Fair Value	6,964.8	7,487.7
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	476.3	109.0
Unrealized Gains	0.0	0.3
Unrealized Losses	(7.2)	(0.8)
Fair Value	469.1	108.5
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	45.7	64.4
Unrealized Gains	0.0	0.3
Unrealized Losses	(2.4)	(0.3)
Fair Value	43.3	64.4
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	606.6	439.7
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.6)	(0.1)
Fair Value	606.0	439.6
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	261.3	255.2
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.4)	(0.1)
Fair Value	260.9	255.1
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	27.4	42.0
Unrealized Gains	0.0	0.0
Unrealized Losses	(1.9)	(0.1)
Fair Value	$ 25.5	$ 41.9

X

- Definition

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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