Retirement and Employement Benefit Plans (Weighted Average Assumptions Used in the Measurement of Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.00%	5.50%	5.75%
Expected return on plan assets	7.50%	7.50%	7.50%
Rate of compensation increase	4.50%	4.50%	4.50%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.00%	5.50%	5.75%