Retirement Plans (Details 1)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Weighted-average assumptions used to determine net
Discount rate		6.00%	6.30%
Expected long-term return on plan assets	7.50%	7.50%	7.50%
Rate of compensation increase	4.80%	4.80%	5.00%
Other Postretirement Benefits [Member]
Weighted-average assumptions used to determine net
Discount rate		6.00%	6.30%
Maximum [Member] | Pension Benefits [Member]
Weighted-average assumptions used to determine net
Discount rate	5.80%
Maximum [Member] | Other Postretirement Benefits [Member]
Weighted-average assumptions used to determine net
Discount rate	5.50%
Minimum [Member] | Pension Benefits [Member]
Weighted-average assumptions used to determine net
Discount rate	5.40%
Minimum [Member] | Other Postretirement Benefits [Member]
Weighted-average assumptions used to determine net
Discount rate	5.30%