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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