Retirement Benefit Plans (Schedule of assumptions used to determine net periodic benefit cost) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Retirement Plans [Member]
Discount rate	4.39%	4.67%	4.92%
Expected return on plan assets	6.01%	5.60%	5.75%
Expected rate of salary increases	3.37%	3.09%	3.34%
Future pension rate increases	2.85%	2.79%	3.22%
Medical Plan [Member]
Discount rate	4.70%	3.79%	4.34%
Expected return on plan assets	6.25%	6.50%	7.00%
Expected rate of salary increases	2.50%	2.50%	3.00%
Future medical cost trend rate increases, percentage range minimum	5.00%	5.00%	5.00%
Future medical cost trend rate increases, percentage range maximum	7.20%	7.60%	8.00%