Retirement Benefit Plans (Assumptions Used in Accounting for Defined Benefit Plans) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	7.75%	8.25%	8.50%
U.S. Pension Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rates	3.50%	4.30%	5.10%
U.S. Pension Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rates	3.90%	4.55%	5.30%
Non-U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rates	4.00%	4.25%	5.25%
Rate of increase in compensation levels	3.50%	3.50%	3.50%
Expected long-term rate of return on assets	6.00%	6.25%	6.50%