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Financial Instruments | 12 Months Ended
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Dec. 31, 2023
Cash, Cash Equivalents And Marketable Securities [Abstract] |
Cash, Cash Equivalents, and Marketable Securities [Text Block] | Financial Instruments Cash, Cash Equivalents, and Marketable Securities The following table summarizes the Company’s cash, cash equivalents, and marketable securities and the fair value categorization of the financial instruments measured at fair value on a recurring basis:
| As of December 31,
| 2023 |  | 2022
| (In millions)
Cash | $ | 25.6 |  |  | $ | 27.0 |
Time deposits | 1.0 |  |  | 4.1 |
Money market funds (Level 1) | 160.3 |  |  | 178.6 |
Debt securities issued by the U.S. Treasury (Level 1) | 744.9 |  |  | 776.1 |
Total | $ | 931.8 |  |  | $ | 985.8 |
Cash and cash equivalents | $ | 240.1 |  |  | $ | 373.6 |
Restricted cash (included in Other long-term assets) | 5.4 |  |  | 5.4 |
Total Cash, cash equivalents, and restricted cash | 245.5 |  |  | 379.0 |
Marketable securities | 686.3 |  |  | 606.8 |
Total | $ | 931.8 |  |  | $ | 985.8 |
The gross and net unrealized gains and losses included in the fair value of the debt securities were not significant for the periods presented. All of the debt securities held as of December 31, 2023 are scheduled to mature in less than one year. Fair Value Measurements The fair value of the Company’s investments in money market funds approximates their face value. Such instruments are included in Cash and cash equivalents. The fair value of the debt securities consisting of U.S. Treasury bills is based on their quoted market prices. Debt securities purchased with original maturities in excess of three months are included in Marketable securities. The fair value of all of these financial instruments are classified as Level 1 in the fair value hierarchy. As of December 31, 2023, the Company’s other financial instruments include cash, accounts receivable, restricted cash, and accounts payable whose carrying values approximated their fair values. The aggregate fair value of the Company’s senior notes is $1.69 billion and $1.65 billion as of December 31, 2023 and December 31, 2022, respectively. The fair values of these debt instruments are based on available market information from public data sources and are classified as Level 2.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent + Details
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- Definition Cash, Cash Equivalents, And Marketable Securities [Abstract] + References No definition available. + Details
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