Benefit Plans	12 Months Ended
Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Benefit Plans	Benefit Plans We sponsor defined contribution plans that cover domestic and non-domestic employees following the completion of an eligibility period. Employer contribution expenses from continuing operations under these plans totaled $46.0 million, $35.0 million and $33.9 million during the years ended December 31, 2017, 2016 and 2015, respectively. Additionally, through the acquisition of IFDS U.K., we now sponsor a defined benefit pension plan which has a net benefit asset as of December 31, 2017 of $0.9 million. We have active and non-active non-qualified deferred compensation plans for senior management, certain highly compensated employees and directors. Certain of the active plans permit existing participants to defer a portion of their compensation until termination of their employment, at which time payment of amounts deferred is made in a lump sum or annual installments. Deferred amounts earn interest at a rate determined by the Board of Directors or are credited with deemed gains or losses of the underlying hypothetical investments. Amounts deferred under these plans were approximately $39.9 million and $12.7 million at December 31, 2017 and 2016, respectively. Changes in the liability are recorded as adjustments to compensation expense. The underlying investments, which are classified as trading securities, are recorded at fair market value with changes recorded as adjustments to Other income, net.

Benefit Plans

We sponsor defined contribution plans that cover domestic and non-domestic employees following the completion of an eligibility period. Employer contribution expenses from continuing operations under these plans totaled $46.0 million, $35.0 million and $33.9 million during the years ended December 31, 2017, 2016 and 2015, respectively. Additionally, through the acquisition of IFDS U.K., we now sponsor a defined benefit pension plan which has a net benefit asset as of December 31, 2017 of $0.9 million.

We have active and non-active non-qualified deferred compensation plans for senior management, certain highly compensated employees and directors. Certain of the active plans permit existing participants to defer a portion of their compensation until termination of their employment, at which time payment of amounts deferred is made in a lump sum or annual installments. Deferred amounts earn interest at a rate determined by the Board of Directors or are credited with deemed gains or losses of the underlying hypothetical investments. Amounts deferred under these plans were approximately $39.9 million and $12.7 million at December 31, 2017 and 2016, respectively. Changes in the liability are recorded as adjustments to compensation expense. The underlying investments, which are classified as trading securities, are recorded at fair market value with changes recorded as adjustments to Other income, net.