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Cash, Cash Equivalents, and Short-term Investments (Tables) | 9 Months Ended
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Sep. 30, 2022
Cash and Cash Equivalents [Abstract] |
Schedule of Cash and Cash Equivalents | Cash, cash equivalents, and short-term investments consisted of the following as of September 30, 2022:
(in millions) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Current Assets: |  |  |  |  |  |  |
Cash | $ | 112.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 112.8 |
Cash equivalents |  |  |  |  |  |  |
Corporate debt securities | 151.5 |  |  | — |  |  | — |  |  | 151.5 |
Money market mutual funds | 142.0 |  |  | — |  |  | — |  |  | 142.0 |
Total cash equivalents | 293.5 |  |  | — |  |  | — |  |  | 293.5 |
Total cash and cash equivalents | 406.3 |  |  | — |  |  | — |  |  | 406.3 |
Short-term investments: |  |  |  |  |  |  |
Corporate debt securities | 25.7 |  |  | — |  |  | — |  |  | 25.7 |
Securities guaranteed by U.S. government | 5.0 |  |  | — |  |  | — |  |  | 5.0 |
Other governmental securities | 1.7 |  |  | — |  |  | — |  |  | 1.7 |
Total short-term investments | 32.4 |  |  | — |  |  | — |  |  | 32.4 |
Total cash, cash equivalents, and short-term investments | $ | 438.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 438.7 |
Cash, cash equivalents, and short-term investments consisted of the following as of December 31, 2021:
(in millions) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Current Assets: |  |  |  |  |  |  |
Cash | $ | 276.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 276.5 |
Cash equivalents |  |  |  |  |  |  |
Corporate debt securities | 15.7 |  |  | — |  |  | — |  |  | 15.7 |
Money market mutual funds | 16.1 |  |  | — |  |  | — |  |  | 16.1 |
Total cash equivalents | 31.8 |  |  | — |  |  | — |  |  | 31.8 |
Total cash and cash equivalents | 308.3 |  |  | — |  |  | — |  |  | 308.3 |
Short-term investments: |  |  |  |  |  |  |
Corporate debt securities | 18.4 |  |  | — |  |  | — |  |  | 18.4 |
Total short-term investments | 18.4 |  |  | — |  |  | — |  |  | 18.4 |
Total cash, cash equivalents, and short-term investments | $ | 326.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 326.7 |
Refer to Note 10 - Fair Value for further information regarding the fair value of our financial instruments.
Schedule of Short-term Securities | The following table summarizes the cost and estimated fair value of the securities classified as short-term investments based on stated effective maturities as of September 30, 2022 and December 31, 2021:
|  | September 30, 2022 |  | December 31, 2021
(in millions) |  | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due within one year |  | $ | 32.4 |  |  | $ | 32.4 |  |  | $ | 18.4 |  |  | $ | 18.4 |
Total |  | $ | 32.4 |  |  | $ | 32.4 |  |  | $ | 18.4 |  |  | $ | 18.4 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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