Retirement Benefit Plans - Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Assumptions used calculating benefit obligation, rounding of the discount rate	0.25%
U.S. Plans:
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Assumptions used calculating benefit obligation, discount rate	3.67%	4.42%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Assumptions used calculating net periodic benefit cost, discount rate	4.42%	5.17%	5.75%
Assumptions used calculating net periodic benefit cost, rate of compensation increase			3.50%
Assumptions used calculating net periodic benefit cost, expected long-term return on assets	6.75%	7.50%	7.50%
Non-U.S. Plans:
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Assumptions used calculating benefit obligation, discount rate	3.86%	5.13%
Assumptions used calculating benefit obligation, rate of compensation increase	2.72%	2.78%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Assumptions used calculating net periodic benefit cost, discount rate	5.13%	5.37%	5.47%
Assumptions used calculating net periodic benefit cost, rate of compensation increase	2.78%	2.80%	2.75%
Assumptions used calculating net periodic benefit cost, expected long-term return on assets	6.49%	7.07%	7.12%
U.S. other postretirement benefit plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Assumptions used calculating benefit obligation, discount rate	3.25%	4.25%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Assumptions used calculating net periodic benefit cost, discount rate	4.25%	4.75%	5.50%