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Cash, Cash Equivalents and Short-Term Investments (Tables) | 6 Months Ended
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Jun. 30, 2020
Cash and Cash Equivalents [Abstract] |
Schedule of Cash, Cash Equivalents and Short-Term Investments | The amortized cost, unrealized gains and losses and estimated fair value of the Company's cash, cash equivalents and short-term investments as of June 30, 2020 and December 31, 2019 consisted of the following:
| As of June 30, 2020
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash | $ | 88.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 88.5 |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |
Money market funds | 241.6 |  |  | — |  |  | (0.1 | ) |  | 241.5 |
Municipal securities | 1.8 |  |  | — |  |  | — |  |  | 1.8 |
Commercial paper | 1.2 |  |  | — |  |  | — |  |  | 1.2 |
Corporate notes and obligations | 1.1 |  |  | — |  |  | — |  |  | 1.1 |
Total cash and cash equivalents | $ | 334.2 |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | 334.1 |
Short-term investments |  |  |  |  |  |  |
Corporate notes and obligations | 358.3 |  |  | 3.3 |  |  | (0.2 | ) |  | 361.4 |
U.S. Treasury securities | 234.1 |  |  | 1.7 |  |  | — |  |  | 235.8 |
Asset backed securities | 83.0 |  |  | 0.7 |  |  | (0.1 | ) |  | 83.6 |
Commercial paper | 40.0 |  |  | — |  |  | — |  |  | 40.0 |
U.S. agency obligations | 27.8 |  |  | 0.1 |  |  | — |  |  | 27.9 |
Certificates of deposit | 26.0 |  |  | — |  |  | — |  |  | 26.0 |
Municipal securities | 5.9 |  |  | 0.1 |  |  | — |  |  | 6.0 |
Foreign government obligations | 2.8 |  |  | — |  |  | — |  |  | 2.8 |
Total short-term investments | 777.9 |  |  | 5.9 |  |  | (0.3 | ) |  | 783.5 |
Total | $ | 1,112.1 |  |  | $ | 5.9 |  |  | $ | (0.4 | ) |  | $ | 1,117.6 |
| As of December 31, 2019
| Amortized cost |  | Unrealized gain |  | Unrealized loss |  | Estimated fair value
Cash | $ | 105.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 105.0 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 444.3 |  |  | — |  |  | — |  |  | 444.3 |
Commercial paper | 2.0 |  |  | — |  |  | — |  |  | 2.0 |
Total cash and cash equivalents | $ | 551.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 551.3 |
Short-term investments |  |  |  |  |  |  | — |
Corporate notes and obligations | 285.5 |  |  | 1.2 |  |  | (0.1 | ) |  | 286.6 |
U.S. Treasury securities | 171.0 |  |  | 0.3 |  |  | — |  |  | 171.3 |
Asset backed securities | 53.8 |  |  | — |  |  | — |  |  | 53.8 |
Certificates of deposit | 38.2 |  |  | — |  |  | — |  |  | 38.2 |
U.S. agency obligations | 27.2 |  |  | — |  |  | — |  |  | 27.2 |
Commercial paper | 24.2 |  |  | — |  |  | — |  |  | 24.2 |
Supranational securities | 4.0 |  |  | — |  |  | — |  |  | 4.0 |
Municipal securities | 2.4 |  |  | — |  |  | — |  |  | 2.4 |
Total short-term investments | 606.3 |  |  | 1.5 |  |  | (0.1 | ) |  | 607.7 |
Total | $ | 1,157.6 |  |  | $ | 1.5 |  |  | $ | (0.1 | ) |  | $ | 1,159.0 |
Contractual Maturities of Short Term Investments | The following table presents the contractual maturities of the Company’s short-term investments as of June 30, 2020:
| As of June 30, 2020
| Amortized cost |  | Estimated fair value
Due within one year | 434.1 |  |  | 435.7 |
Due between one to three years | 304.2 |  |  | 307.9 |
Due after three years | 39.6 |  |  | 39.9 |
Total | $ | 777.9 |  |  | $ | 783.5 |

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