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Cash and Cash Equivalents and Short-term Investments
9 Months Ended
Sep. 30, 2021
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, 2021, Cash and cash equivalents and Short-term investments were $919 million compared to $1,192 million at December 31, 2020, a decrease of $273 million. Of the total balances, $162 million and $102 million were restricted as to their use at September 30, 2021 and December 31, 2020. Included within Short-term investments as of September 30, 2021 and December 31, 2020, respectively, were £84.3 million ($115.3 million at September 30, 2021 exchange rates) and £44.4 million ($60.2 million at December 31, 2020 exchange rates) of operating funds required to be held by the Company in the U.K. by the Financial Conduct Authority (the “FCA”), a U.K.-based regulator. In the third quarter of 2021, following discussions with the FCA, and to take into consideration the potential future effects from market volatility due to COVID-19, the Company changed the basis of calculating its liquidity requirement and increased the amount of funds held by £34.0 million.($46.5 million at September 30, 2021 exchange rates).