Actuarial Assumptions used to Compute Net Periodic Pension Cost for U.K. Plan (Details) - UNITED KINGDOM	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate	3.50%	4.60%	4.30%
Weighted-average long-term rate of return on plan assets	5.60%	5.90%	5.70%