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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)

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