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Investments (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Gross Unrealized Gains and (Losses) Aggregated by Investment Category | The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:
As of September 30, 2021: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 24.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 24.0 |
Bankers’ acceptance drafts |  |  | 2.5 |  |  |  | — |  |  |  | — |  |  |  | 2.5 |
Commercial paper |  |  | 86.2 |  |  |  | — |  |  |  | — |  |  |  | 86.2 |
Corporate obligations |  |  | 35.3 |  |  |  | — |  |  |  | — |  |  |  | 35.3 |
U.S. treasury obligations |  |  | 98.3 |  |  |  | — |  |  |  | — |  |  |  | 98.3 |
|  | $ | 246.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 246.3 |
As of September 30, 2021: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 5.5 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 6.4 |
As of December 31, 2020: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 0.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.7 |
Bankers' acceptance drafts |  |  | 3.8 |  |  |  | — |  |  |  | — |  |  |  | 3.8 |
U.S. treasury obligations |  |  | 223.2 |  |  |  | — |  |  |  | — |  |  |  | 223.2 |
|  | $ | 227.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 227.7 |
As of December 31, 2020: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 5.6 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 6.5 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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