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Cash, Cash Equivalents and Short-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
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 December 31, 2018 consisted of the following:
| Amortized cost |  | Unrealized gain |  | Unrealized loss |  | Estimated fair value
Cash | $ | 103.0 |  |  | $ | — |  |  | $ | — |  |  | 103.0 |
Cash equivalents |  |  |  |  |  |  |
Money market funds | 355.5 |  |  | — |  |  | — |  |  | 355.5 |
Commercial paper | 27.4 |  |  | — |  |  | — |  |  | 27.4 |
U.S. Treasury securities | 33.4 |  |  | — |  |  | — |  |  | 33.4 |
Total cash and cash equivalents | $ | 519.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 519.3 |
Short-term investments |  |  |  |  |  |  |
Corporate notes and obligations | 269.6 |  |  | 0.1 |  |  | (0.5 | ) |  | 269.2 |
U.S. Treasury securities | 176.0 |  |  | — |  |  | (0.1 | ) |  | 175.9 |
Certificates of deposit | 70.6 |  |  | — |  |  | — |  |  | 70.6 |
U.S. agency obligations | 37.1 |  |  | — |  |  | — |  |  | 37.1 |
Commercial paper | 17.2 |  |  | — |  |  | — |  |  | 17.2 |
Total short-term investments | 570.5 |  |  | 0.1 |  |  | (0.6 | ) |  | 570.0 |
Total | $ | 1,089.8 |  |  | $ | 0.1 |  |  | $ | (0.6 | ) |  | $ | 1,089.3 |
Contractual Maturities of Short Term Investments | The following table presents the contractual maturities of the Company’s short-term investments as of December 31, 2018:
| Amortized cost |  | Estimated fair value
Due within one year | $ | 327.6 |  |  | $ | 327.5 |
Due between one to three years | 242.9 |  |  | 242.5 |
Total | $ | 570.5 |  |  | $ | 570.0 |
Short-Term Investments In Unrealized Loss Positions | As of December 31, 2018, the following short-term investments were in unrealized loss positions:
| Less than 12 months |  | 12 months or greater |  | Total
| Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Corporate notes and obligations | $ | 209.5 |  |  | $ | (0.5 | ) |  | $ | — |  |  | $ | — |  |  | $ | 209.5 |  |  | $ | (0.5 | )
U.S. Treasury securities | 127.8 |  |  | (0.1 | ) |  | — |  |  | — |  |  | 127.8 |  |  | (0.1 | )
Total | $ | 337.3 |  |  | $ | (0.6 | ) |  | $ | — |  |  | $ | — |  |  | $ | 337.3 |  |  | $ | (0.6 | )

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- Definition Tabular disclosure of fair value amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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