Marketable Securities - Schedule of Investments in Available For Sale Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 9,994.4	$ 8,428.7
Unrealized Gains	0.1	10.8
Unrealized Losses	(282.4)	(42.3)
Fair Value	9,712.1	8,397.2
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	7,849.1	7,518.4
Unrealized Gains	0.1	10.2
Unrealized Losses	(271.0)	(40.9)
Fair Value	7,578.2	7,487.7
U.S. government and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	1,051.8	109.0
Unrealized Gains	0.0	0.3
Unrealized Losses	(5.8)	(0.8)
Fair Value	1,046.0	108.5
Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	45.9	64.4
Unrealized Gains	0.0	0.3
Unrealized Losses	(1.8)	(0.3)
Fair Value	44.1	64.4
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	669.2	439.7
Unrealized Gains	0.0	0.0
Unrealized Losses	(1.4)	(0.1)
Fair Value	667.8	439.6
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	337.5	255.2
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.9)	(0.1)
Fair Value	336.6	255.1
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	40.9	42.0
Unrealized Gains	0.0	0.0
Unrealized Losses	(1.5)	(0.1)
Fair Value	$ 39.4	$ 41.9