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Cash and Cash Equivalents and Short-term Investments	6 Months Ended
Cash and Cash Equivalents and Short-term Investments	Jun. 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 June 30, 2019, Cash and cash equivalents and Short-term investments were $816 million compared to $828 million at December 31, 2018, a decrease of $12 million. Of the total balances, $99 million and $91 million were restricted as to their use at June 30, 2019 and December 31, 2018, respectively. Included within Short-term investments as of June 30, 2019 and December 31, 2018 were £42.8 million ($54.3 million at June 30, 2019 exchange rates) and £42.7 million ($53.9 million at December 31, 2018 exchange rates), respectively, 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.