Retirement Benefit Plans (Details 7)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
U.S. and Puerto Rico [Member]
Weighted average actuarial assumptions used to determine projected benefit obligation for defined benefit retirement plans
Discount rate	5.05%	5.82%	6.26%
Rate of compensation increase	3.81%	3.80%	3.80%
Foreign-based defined benefit plans [Member]
Weighted average actuarial assumptions used to determine projected benefit obligation for defined benefit retirement plans
Discount rate	2.49%	2.82%	3.25%
Rate of compensation increase	2.76%	2.61%	2.46%