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Cash, Cash Equivalents, and Marketable Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, 2021 and December 31, 2020 (in millions):
|  | September 30, 2021 |
|  | 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 |  | $ | 1,695.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,695.4 |  |  | $ | 1,695.4 |  |  | $ | — |  |  | $ | — |
Level 1 (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 7.0 |  |  |  | — |  |  |  | — |  |  |  | 7.0 |  |  |  | 7.0 |  |  |  | — |  |  |  | — |
U.S. Treasury securities |  |  | 27.6 |  |  |  | — |  |  |  | — |  |  |  | 27.6 |  |  |  | — |  |  |  | 19.3 |  |  |  | 8.3 |
Subtotal |  |  | 34.6 |  |  |  | — |  |  |  | — |  |  |  | 34.6 |  |  |  | 7.0 |  |  |  | 19.3 |  |  |  | 8.3 |
Level 2 (b): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 3.9 |  |  |  | — |  |  |  | — |  |  |  | 3.9 |  |  |  | — |  |  |  | 3.9 |  |  |  | — |
U.S. government agency securities |  |  | 5.3 |  |  |  | — |  |  |  | — |  |  |  | 5.3 |  |  |  | — |  |  |  | 4.0 |  |  |  | 1.3 |
Corporate debt securities |  |  | 109.7 |  |  |  | 0.1 |  |  |  | — |  |  |  | 109.8 |  |  |  | 0.5 |  |  |  | 61.1 |  |  |  | 48.2 |
Subtotal |  |  | 118.9 |  |  |  | 0.1 |  |  |  | — |  |  |  | 119.0 |  |  |  | 0.5 |  |  |  | 69.0 |  |  |  | 49.5 |
Total |  | $ | 1,848.9 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 1,849.0 |  |  | $ | 1,702.9 |  |  | $ | 88.3 |  |  | $ | 57.8 |
|  | 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 |
(a) Valuations based on quoted prices for identical assets or 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.
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 September 30, 2021 and December 31, 2020 (in millions, except number of marketable debt securities in a loss position):
|  | September 30, 2021 |  |  | December 31, 2020 |
|  | Fair Value of Marketable Debt Securities |  |  | Number of Marketable Debt Securities in a Loss Position |  |  | Unrealized Losses (c) |  |  | Fair Value of Marketable Debt Securities |  |  | Number of Marketable Debt Securities in a Loss Position |  |  | Unrealized Losses (c) |
Corporate debt securities |  | $ | 50.0 |  |  |  | 63 |  |  | $ | — |  |  | $ | 42.9 |  |  |  | 56 |  |  | $ | — |
U.S. Treasury securities |  |  | 8.1 |  |  |  | 10 |  |  |  | — |  |  |  | 1.7 |  |  |  | 3 |  |  |  | — |
U.S. government agency securities |  |  | 0.8 |  |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Certificates of deposit |  |  | 0.5 |  |  |  | 1 |  |  |  | — |  |  |  | 1.3 |  |  |  | 2 |  |  |  | — |
Commercial paper |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2.2 |  |  |  | 1 |  |  |  | — |
|  | $ | 59.4 |  |  |  | 76 |  |  | $ | — |  |  | $ | 48.1 |  |  |  | 62 |  |  | $ | — |
(c) Unrealized losses were insignificant for the periods ended September 30, 2021 and December 31, 2020.

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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=123581744&loc=d3e27290-111563 + Details
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