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Cash, Cash Equivalents, and Marketable Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash Cash Equivalents And Short Term Investments [Abstract] |
Schedule of Cash and Available-For-Sale Debt Securities by Major Asset Category | The following table shows the Company’s cash and available-for-sale (AFS) debt securities by major asset category at December 31, 2020 and 2019 (in millions):
|  | December 31, 2020 |
|  | Adjusted Cost Basis |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Short-Term Marketable Debt Securities |  |  | Long-Term Marketable Debt Securities |
Cash and cash equivalents |  | $ | 970.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 970.5 |  |  | $ | 970.5 |  |  | $ | — |  |  | $ | — |
Level 1 (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 0.6 |  |  |  | — |  |  |  | — |  |  |  | 0.6 |  |  |  | 0.6 |  |  |  | — |  |  |  | — |
U.S. Treasury securities |  |  | 28.1 |  |  |  | 0.2 |  |  |  | — |  |  |  | 28.3 |  |  |  | — |  |  |  | 18.9 |  |  |  | 9.4 |
Subtotal |  |  | 28.7 |  |  |  | 0.2 |  |  |  | — |  |  |  | 28.9 |  |  |  | 0.6 |  |  |  | 18.9 |  |  |  | 9.4 |
Level 2 (b): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 5.9 |  |  |  | — |  |  |  | — |  |  |  | 5.9 |  |  |  | 1.1 |  |  |  | 4.8 |  |  |  | — |
Commercial paper |  |  | 3.2 |  |  |  | — |  |  |  | — |  |  |  | 3.2 |  |  |  | 1.0 |  |  |  | 2.2 |  |  |  | — |
U.S. government agency securities |  |  | 6.6 |  |  |  | — |  |  |  | — |  |  |  | 6.6 |  |  |  | — |  |  |  | 2.6 |  |  |  | 4.0 |
Corporate debt securities |  |  | 107.5 |  |  |  | 0.3 |  |  |  | — |  |  |  | 107.8 |  |  |  | 1.4 |  |  |  | 77.1 |  |  |  | 29.3 |
Subtotal |  |  | 123.2 |  |  |  | 0.3 |  |  |  | — |  |  |  | 123.5 |  |  |  | 3.5 |  |  |  | 86.7 |  |  |  | 33.3 |
Total |  | $ | 1,122.4 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | 1,122.9 |  |  | $ | 974.6 |  |  | $ | 105.6 |  |  | $ | 42.7 |
|  | December 31, 2019 |
|  | Adjusted Cost Basis |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Fair Value (c) |  |  | Cash and Cash Equivalents |  |  | Short-Term Marketable Debt Securities |  |  | Long-Term Marketable Debt Securities |
Cash and cash equivalents |  | $ | 675.6 |  |  |  |  |  |  |  |  |  |  | $ | 675.6 |  |  | $ | 675.6 |  |  | $ | — |  |  | $ | — |
Level 1 (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | — |  |  |  | — |
U.S. Treasury securities |  |  | 27.1 |  |  |  | — |  |  |  | — |  |  |  | 27.1 |  |  |  | 3.1 |  |  |  | 11.5 |  |  |  | 12.5 |
Subtotal |  |  | 27.2 |  |  |  | — |  |  |  | — |  |  |  | 27.2 |  |  |  | 3.2 |  |  |  | 11.5 |  |  |  | 12.5 |
Level 2 (b): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 3.9 |  |  |  | — |  |  |  | — |  |  |  | 3.9 |  |  |  | — |  |  |  | 3.9 |  |  |  | — |
Commercial paper |  |  | 5.6 |  |  |  | — |  |  |  | — |  |  |  | 5.6 |  |  |  | 0.7 |  |  |  | 4.9 |  |  |  | — |
U.S. government agency securities |  |  | 7.0 |  |  |  | — |  |  |  | — |  |  |  | 7.0 |  |  |  | — |  |  |  | 3.0 |  |  |  | 4.0 |
Corporate debt securities |  |  | 106.2 |  |  |  | — |  |  |  | — |  |  |  | 106.2 |  |  |  | — |  |  |  | 64.6 |  |  |  | 41.6 |
Subtotal |  |  | 122.7 |  |  |  | — |  |  |  | — |  |  |  | 122.7 |  |  |  | 0.7 |  |  |  | 76.4 |  |  |  | 45.6 |
Total |  | $ | 825.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 825.5 |  |  | $ | 679.5 |  |  | $ | 87.9 |  |  | $ | 58.1 |
| (a) | Valuations based on quoted prices for identical assets and liabilities in active markets.
| (b) | Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.
| (c) | Unrealized gains and losses were insignificant as of December 31, 2019. Therefore, the fair value approximates the adjusted cost basis for each major asset category.
Schedule of Marketable Debt Securities in Continuous Loss Position | The following table provides information about the Company’s marketable debt securities that have been in a continuous loss position as of December 31, 2020 and 2019 (in millions, except number of marketable debt securities in a loss position):
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Fair Value of Marketable Debt Securities |  |  | Number of Marketable Debt Securities in a Loss Position |  |  | Unrealized Losses (d) |  |  | Fair Value of Marketable Debt Securities |  |  | Number of Marketable Debt Securities in a Loss Position |  |  | Unrealized Losses (d) |
Corporate debt securities |  | $ | 42.9 |  |  |  | 56 |  |  | $ | — |  |  | $ | 63.3 |  |  |  | 61 |  |  | $ | — |
Commercial paper |  |  | 2.2 |  |  |  | 1 |  |  |  | — |  |  |  | 0.8 |  |  |  | 1 |  |  |  | — |
U.S. Treasury securities |  |  | 1.7 |  |  |  | 3 |  |  |  | — |  |  |  | 14.0 |  |  |  | 9 |  |  |  | — |
Certificates of deposit |  |  | 1.3 |  |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 48.1 |  |  |  | 62 |  |  | $ | — |  |  | $ | 78.1 |  |  |  | 71 |  |  | $ | — |
| (d) | Unrealized losses were insignificant for the periods ended December 31, 2020 and 2019.

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details
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