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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2022
Fair Value Disclosures [Abstract] |
Schedule of assets measured at fair value on a recurring basis | The table below summarizes the Company's assets which are measured at fair value on a recurring basis. The following fair value hierarchy is used to classify assets, based on inputs to valuation techniques utilized to measure fair value: •Level 1 - Quoted prices in active markets for identical assets •Level 2 - Significant other observable inputs, such as quoted market prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, or model-based valuations in which significant inputs used are observable •Level 3 - Significant other unobservable inputs
(In millions) |  |  | Fair Value Measurements at Reporting Date
As of September 30, 2022 | Fair Value |  | Level 1 |  | Level 2
Available-for-sale debt securities: |  |  |  |  |
Corporate bonds | $ | 6,964.8 |  |  | $ | — |  |  | $ | 6,964.8 |
U.S. government and government agency obligations | 469.1 |  |  | — |  |  | 469.1 |
Sovereign bonds | 43.3 |  |  | — |  |  | 43.3 |
Commercial paper | 606.0 |  |  | — |  |  | 606.0 |
Certificates of deposit | 260.9 |  |  | — |  |  | 260.9 |
Asset-backed securities | 25.5 |  |  | — |  |  | 25.5 |
Equity securities (unrestricted) | 32.5 |  |  | 32.5 |  |  | — |
Equity securities (restricted) | 1,096.9 |  |  | 1,096.9 |  |  | — |
| $ | 9,499.0 |  |  | $ | 1,129.4 |  |  | $ | 8,369.6 |
As of December 31, 2021 |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |
Corporate bonds | $ | 7,487.7 |  |  | $ | — |  |  | $ | 7,487.7 |
U.S. government and government agency obligations | 108.5 |  |  | — |  |  | 108.5 |
Sovereign bonds | 64.4 |  |  | — |  |  | 64.4 |
Commercial paper | 439.6 |  |  | — |  |  | 439.6 |
Certificates of deposit | 255.1 |  |  | — |  |  | 255.1 |
Asset-backed securities | 41.9 |  |  | — |  |  | 41.9 |
Equity securities (unrestricted) | 58.4 |  |  | 58.4 |  |  | — |
Equity securities (restricted) | 1,191.5 |  |  | 1,191.5 |  |  | — |
| $ | 9,647.1 |  |  | $ | 1,249.9 |  |  | $ | 8,397.2 |

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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