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Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 8,369.6 | $ 8,397.2
Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 6,964.8 | 7,487.7
U.S. government and government agency obligations |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 469.1 | 108.5
Sovereign bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 43.3 | 64.4
Commercial paper |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 606.0 | 439.6
Certificates of deposit |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 260.9 | 255.1
Asset-backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 25.5 | 41.9
Measured on a recurring basis |  |
Available-for-sale debt securities: |  |
Total marketable securities | 9,499.0 | 9,647.1
Measured on a recurring basis | Unrestricted |  |
Available-for-sale debt securities: |  |
Equity securities | 32.5 | 58.4
Measured on a recurring basis | Restricted |  |
Available-for-sale debt securities: |  |
Equity securities | 1,096.9 | 1,191.5
Measured on a recurring basis | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 6,964.8 | 7,487.7
Measured on a recurring basis | U.S. government and government agency obligations |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 469.1 | 108.5
Measured on a recurring basis | Sovereign bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 43.3 | 64.4
Measured on a recurring basis | Commercial paper |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 606.0 | 439.6
Measured on a recurring basis | Certificates of deposit |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 260.9 | 255.1
Measured on a recurring basis | Asset-backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 25.5 | 41.9
Measured on a recurring basis | Level 1 |  |
Available-for-sale debt securities: |  |
Total marketable securities | 1,129.4 | 1,249.9
Measured on a recurring basis | Level 1 | Unrestricted |  |
Available-for-sale debt securities: |  |
Equity securities | 32.5 | 58.4
Measured on a recurring basis | Level 1 | Restricted |  |
Available-for-sale debt securities: |  |
Equity securities | 1,096.9 | 1,191.5
Measured on a recurring basis | Level 1 | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.0 | 0.0
Measured on a recurring basis | Level 1 | U.S. government and government agency obligations |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.0 | 0.0
Measured on a recurring basis | Level 1 | Sovereign bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.0 | 0.0
Measured on a recurring basis | Level 1 | Commercial paper |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.0 | 0.0
Measured on a recurring basis | Level 1 | Certificates of deposit |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.0 | 0.0
Measured on a recurring basis | Level 1 | Asset-backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.0 | 0.0
Measured on a recurring basis | Level 2 |  |
Available-for-sale debt securities: |  |
Total marketable securities | 8,369.6 | 8,397.2
Measured on a recurring basis | Level 2 | Unrestricted |  |
Available-for-sale debt securities: |  |
Equity securities | 0.0 | 0.0
Measured on a recurring basis | Level 2 | Restricted |  |
Available-for-sale debt securities: |  |
Equity securities | 0.0 | 0.0
Measured on a recurring basis | Level 2 | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 6,964.8 | 7,487.7
Measured on a recurring basis | Level 2 | U.S. government and government agency obligations |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 469.1 | 108.5
Measured on a recurring basis | Level 2 | Sovereign bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 43.3 | 64.4
Measured on a recurring basis | Level 2 | Commercial paper |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 606.0 | 439.6
Measured on a recurring basis | Level 2 | Certificates of deposit |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 260.9 | 255.1
Measured on a recurring basis | Level 2 | Asset-backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 25.5 | $ 41.9

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