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Cash and Cash Equivalents and Short-Term Investments	3 Months Ended
Cash and Cash Equivalents and Short-Term Investments	Mar. 31, 2022
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 March 31, 2022, Cash and cash equivalents and Short-term investments were $1,050 million compared to $836 million at December 31, 2021, an increase of $214 million. Of the total balances, $163 million and $160 million were restricted as to their use at March 31, 2022 and December 31, 2021, respectively. Included within Short-term investments as of March 31, 2022 and December 31, 2021, were £84.3 million ($111.1 million at March 31, 2022 exchange rates and $112.8 million at December 31, 2021 exchange rates) of operating funds required to be held by the Company in the U.K. by the FCA, a U.K.-based regulator.