Retirement Plans - Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
United States
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.75%	4.75%	5.30%
Expected return on plan assets	8.00%	8.00%	8.00%
Rate of compensation increase	0.00%	0.00%	4.75%
International
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.09%	4.56%	5.00%
Expected return on plan assets	4.32%	4.92%	5.52%
Rate of compensation increase	2.57%	2.77%	2.98%