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Marketable Securities - Schedule of Fair Value and Unrealized Losses of Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months $ 6,463.2 $ 6,516.3
Unrealized Loss - Less than 12 months (233.4) (42.3)
Fair Value - 12 Months or Greater 1,604.1 0.0
Unrealized Loss - 12 Months or Greater (113.4) 0.0
Fair Value - Total 8,067.3 6,516.3
Unrealized Loss - Total (346.8) (42.3)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 5,360.5 5,889.3
Unrealized Loss - Less than 12 months (224.8) (40.9)
Fair Value - 12 Months or Greater 1,561.9 0.0
Unrealized Loss - 12 Months or Greater (109.5) 0.0
Fair Value - Total 6,922.4 5,889.3
Unrealized Loss - Total (334.3) (40.9)
U.S. government and government agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 249.3 90.0
Unrealized Loss - Less than 12 months (4.8) (0.8)
Fair Value - 12 Months or Greater 20.9 0.0
Unrealized Loss - 12 Months or Greater (2.4) 0.0
Fair Value - Total 270.2 90.0
Unrealized Loss - Total (7.2) (0.8)
Sovereign bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 27.5 37.0
Unrealized Loss - Less than 12 months (1.4) (0.3)
Fair Value - 12 Months or Greater 15.8 0.0
Unrealized Loss - 12 Months or Greater (1.0) 0.0
Fair Value - Total 43.3 37.0
Unrealized Loss - Total (2.4) (0.3)
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 591.0 295.7
Unrealized Loss - Less than 12 months (0.6) (0.1)
Fair Value - 12 Months or Greater 0.0 0.0
Unrealized Loss - 12 Months or Greater 0.0 0.0
Fair Value - Total 591.0 295.7
Unrealized Loss - Total (0.6) (0.1)
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 214.9 169.4
Unrealized Loss - Less than 12 months (0.4) (0.1)
Fair Value - 12 Months or Greater 0.0 0.0
Unrealized Loss - 12 Months or Greater 0.0 0.0
Fair Value - Total 214.9 169.4
Unrealized Loss - Total (0.4) (0.1)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 20.0 34.9
Unrealized Loss - Less than 12 months (1.4) (0.1)
Fair Value - 12 Months or Greater 5.5 0.0
Unrealized Loss - 12 Months or Greater (0.5) 0.0
Fair Value - Total 25.5 34.9
Unrealized Loss - Total $ (1.9) $ (0.1)