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Voluntary Separation Incentive Programs, net	12 Months Ended
Voluntary Separation Incentive Programs, net	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Voluntary Separation Incentive Programs, net	Voluntary Separation Incentive Programs, net On November 13, 2015, we announced a series of regional voluntary separation incentive programs (the "Programs") aimed at reducing headcount and associated compensation costs. The Programs were offered to our employees in jurisdictions where it was practical to do so. Employees who elected to participate in the Programs were accepted only upon approval by management. In the fourth quarter of 2015, we recognized a charge of $36.9 million as a result of the Programs, consisting of $33.8 million in cash severance benefits and $3.1 million in accelerated equity compensation expense related to awards that will continue to vest after termination of employment, subject to our achievement of the underlying profitability targets, when applicable. In 2016, we recognized a net credit of $0.6 million primarily resulting from our quarterly assessment of the likelihood that the performance-based stock units held by participants in the Programs will vest. In 2017, we recognized a credit of $0.2 million as a result of the reversal of the remaining liability related to the Programs following the final payment of severance benefits. Employee transitions and cash severance payments under the Programs have been completed. Restructuring Charges, net On July 16, 2014, our Board of Directors approved a restructuring plan (the "2014 Restructuring Plan") principally impacting our operations in the U.S. and the U.K. The 2014 Restructuring Plan resulted in Restructuring Charges (net) of $14.2 million recognized in 2014, consisting of $13.9 million in employee termination benefits and approximately $0.3 million in lease exit costs. In 2015, we recognized a credit of approximately $1 million in Restructuring Charges (net) as a result of adjustments to the initial accrual for employee termination benefits. The headcount reductions resulting from the 2014 Restructuring Plan were completed in the third quarter of 2015, and the associated liability has been fully settled.