Retirement Plans - Information about Plan Assets (Details)	12 Months Ended
	Dec. 31, 2012 Fixed income securities	Dec. 31, 2012 Equity securities	Dec. 31, 2012 Other investments	Dec. 31, 2013 United States	Dec. 31, 2012 United States	Dec. 31, 2013 United States Short-term investments	Dec. 31, 2012 United States Short-term investments	Dec. 31, 2013 United States Fixed income securities	Dec. 31, 2012 United States Fixed income securities	Dec. 31, 2013 United States Equity securities	Dec. 31, 2012 United States Equity securities	Dec. 31, 2013 United States Other investments Abosolute return strategy funds	Dec. 31, 2012 United States Other investments Abosolute return strategy funds	Dec. 31, 2013 United States Other investments Insurance contracts	Dec. 31, 2012 United States Other investments Insurance contracts	Dec. 31, 2013 International	Dec. 31, 2012 International	Dec. 31, 2013 International Short-term investments	Dec. 31, 2012 International Short-term investments	Dec. 31, 2013 International Fixed income securities	Dec. 31, 2012 International Fixed income securities	Dec. 31, 2013 International Equity securities	Dec. 31, 2012 International Equity securities	Dec. 31, 2013 International Other investments Abosolute return strategy funds	Dec. 31, 2012 International Other investments Abosolute return strategy funds	Dec. 31, 2013 International Other investments Insurance contracts	Dec. 31, 2012 International Other investments Insurance contracts
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations				100.00%	100.00%	1.00%	9.00%	18.00%	19.00%	63.00%	56.00%	18.00%	16.00%	0.00%	0.00%	100.00%	100.00%	1.00%	1.00%	23.00%	40.00%	0.00%	26.00%	0.00%	0.00%	76.00%	33.00%
Target plan asset allocations range, minimum	20.00%	35.00%	10.00%
Target plan asset allocations range, maximum	40.00%	80.00%	20.00%