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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2019
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans We maintain a qualified defined contribution 401(k) plan, which covers substantially all of our U.S. employees. Under the plan, participants are entitled to make pre-tax and/or Roth post-tax contributions up to the annual maximums established by the Internal Revenue Service. We match a certain percentage of participant contributions pursuant to the terms of the plan, which contributions are limited to a percentage of the participant’s eligible compensation. Effective in 2018, we increased our matching percentage. We made contributions related to the plan of $17.4 million, $15.2 million and $11.6 million during the years ended December 31, 2019, 2018 and 2017, respectively. We also maintain several defined contribution pension plans for our employees in the United Kingdom and other foreign countries. We contributed to these plans $7.3 million, $7.7 million and $6.4 million during the years ended December 31, 2019, 2018 and 2017, respectively.