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Investments (Tables) | 3 Months Ended
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Mar. 31, 2020
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 March 31, 2020: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 10.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 10.4 |
Bankers' acceptance drafts |  |  | 2.4 |  |  |  | — |  |  |  | — |  |  |  | 2.4 |
Commercial paper |  |  | 26.4 |  |  |  | — |  |  |  | (0.2 | ) |  |  | 26.2 |
U.S. treasury obligations |  |  | 10.0 |  |  |  | — |  |  |  | — |  |  |  | 10.0 |
U.S. agency obligations |  |  | 12.3 |  |  |  | 0.1 |  |  |  | — |  |  |  | 12.4 |
|  | $ | 61.5 |  |  | $ | 0.1 |  |  | $ | (0.2 | ) |  | $ | 61.4 |
As of March 31, 2020: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 5.4 |  |  | $ | 0.6 |  |  | $ | — |  |  | $ | 6.0 |
As of December 31, 2019: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 13.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 13.1 |
Bankers' acceptance drafts |  |  | 4.0 |  |  |  | — |  |  |  | — |  |  |  | 4.0 |
Commercial paper |  |  | 61.5 |  |  |  | — |  |  |  | (0.3 | ) |  |  | 61.2 |
U.S. treasury obligations |  |  | 5.0 |  |  |  | — |  |  |  | — |  |  |  | 5.0 |
U.S. agency obligations |  |  | 26.1 |  |  |  | — |  |  |  | — |  |  |  | 26.1 |
|  | $ | 109.7 |  |  | $ | — |  |  | $ | (0.3 | ) |  | $ | 109.4 |
As of December 31, 2019: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 5.2 |  |  | $ | 0.6 |  |  | $ | — |  |  | $ | 5.8 |

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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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