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Retirement Benefit Plans (Schedule of assumptions used to determine net periodic benefit cost) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Medical Plan [Member]
     
Discount rate 4.34% 5.20% 5.80%
Expected return on plan assets 7.00% 7.00% 7.00%
Expected rate of salary increases 3.00% 3.00% 4.50%
Future medical cost trend rate increases, percentage range minimum 5.00% 5.00% 5.00%
Future medical cost trend rate increases, percentage range maximum 8.00% 8.00% 8.00%
Retirement Plans [Member]
     
Discount rate 4.92% 5.65% 5.68%
Expected return on plan assets 5.75% 5.84% 6.20%
Expected rate of salary increases 3.34% 3.60% 3.62%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Future Pension Rate Increases 3.22% 3.49% 3.50%