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Cash and Cash Equivalents and Short-term Investments | 9 Months Ended
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Sep. 30, 2019
Cash, Cash Equivalents, and Short-term Investments [Abstract] |
Cash and Cash Equivalents and Short-term Investments | Cash and Cash Equivalents and Short-term Investments Cash and cash equivalents include cash balances and all highly liquid instruments with initial maturities of three months or less. Short-term investments consist of money market funds. The estimated fair value of cash and cash equivalents and short-term investments approximates their carrying values. At September 30, 2019, Cash and cash equivalents and Short-term investments were $779 million compared to $828 million at December 31, 2018, a decrease of $49 million. Of the total balances, $96 million and $91 million were restricted as to their use at September 30, 2019 and December 31, 2018, respectively. Included within Short-term investments as of September 30, 2019 and December 31, 2018 were £42.7 million ($52.6 million at September 30, 2019 exchange rates and $53.9 million at December 31, 2018 exchange rates) of operating funds required to be held by the Company in the United Kingdom (the “U.K.”) by the Financial Conduct Authority (the “FCA”), a U.K.-based regulator.

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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