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Cash, Cash Equivalents, and Short-term Investments - Components (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | --- | ---
Current assets: |  |  |  |
Cash | $ 112.8 | $ 276.5 |  |
Cash equivalents |  |  |  |
Total cash equivalents | 293.5 | 31.8 |  |
Cash and cash equivalents | 406.3 | 308.3 | [1] | $ 196.8
Short-term investments: |  |  |  |
Amortized Cost | 32.4 | 18.4 |  |
Unrealized Gains | 0.0 | 0.0 |  |
Unrealized Losses | 0.0 | 0.0 |  |
Estimated Fair Value | 32.4 | 18.4 |  |
Cash, cash equivalents, and short-term investments, amortized cost | 438.7 | 326.7 |  |
Total cash, cash equivalents, and short-term investments | 438.7 | 326.7 |  |
Corporate debt securities |  |  |  |
Cash equivalents |  |  |  |
Total cash equivalents | 151.5 | 15.7 |  |
Short-term investments: |  |  |  |
Amortized Cost | 25.7 | 18.4 |  |
Estimated Fair Value | 25.7 | 18.4 |  |
Money market mutual funds |  |  |  |
Cash equivalents |  |  |  |
Total cash equivalents | 142.0 | $ 16.1 |  |
Securities guaranteed by U.S. government |  |  |  |
Short-term investments: |  |  |  |
Amortized Cost | 5.0 |  |  |
Unrealized Gains | 0.0 |  |  |
Unrealized Losses | 0.0 |  |  |
Estimated Fair Value | 5.0 |  |  |
Other governmental securities |  |  |  |
Short-term investments: |  |  |  |
Amortized Cost | 1.7 |  |  |
Unrealized Gains | 0.0 |  |  |
Unrealized Losses | 0.0 |  |  |
Estimated Fair Value | $ 1.7 |  |  |
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2021 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

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