Pensions and Other Post-retirement Benefits (Details 2)					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Pension Benefits [Member]	Dec. 31, 2011 Pension Benefits [Member]	Dec. 31, 2010 Pension Benefits [Member]	Dec. 31, 2012 Other Benefits [Member]	Dec. 31, 2011 Other Benefits [Member]	Dec. 31, 2010 Other Benefits [Member]
Weighted-average assumptions used to determine benefit obligations at fiscal year end
Discount rate					3.99%	4.78%		3.75%	4.50%
Rate of compensation increase	4.50%	4.00%	3.00%	2.00%	4.44%	4.46%		4.50%	4.50%
Weighted-average assumptions used to determine net cost for the fiscal year
Discount rate					4.81%	5.49%	5.86%	4.50%	5.13%	5.88%
Expected long-term return on plan assets					7.65%	7.88%	8.18%
Rate of compensation increase					4.43%	3.97%	2.99%	4.50%	4.00%	3.00%