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Retirement Benefit Plans (Schedule of assumptions used to determine net periodic benefit cost) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Medical Plan [Member]
     
Discount rate 5.20% 5.80% 6.10%
Expected return on plan assets 7.00% 7.00% 7.00%
Expected rate of salary increases 3.00% 4.50% 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 5.65% 5.68% 5.84%
Expected return on plan assets 5.84% 6.20% 6.15%
Expected rate of salary increases 3.60% 3.62% 3.09%
Future pension rate increases 3.49% 3.50% 2.88%