Pension And Other Postretirement Benefits (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended									12 Months Ended				12 Months Ended
	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008	Dec. 31, 2011 Pension [Member]	Dec. 31, 2010 Pension [Member]	Dec. 31, 2009 Pension [Member]	Dec. 31, 2011 U.S. Pension Plans [Member]	Dec. 31, 2011 U.S. And Foreign Defined Benefit Pension Plans [Member]	Dec. 31, 2010 U.S. And Foreign Defined Benefit Pension Plans [Member]	Dec. 31, 2011 Other Benefits [Member]	Dec. 31, 2010 Other Benefits [Member]	Dec. 31, 2009 Other Benefits [Member]	Dec. 31, 2011 U.S. Other Benefit Plans [Member]	Dec. 31, 2011 Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum age to attain pension benefits					50
Maximum age plus years service to attain pension benefits					65
Adjustment to the pension and postretirement liabilities	$ 5,600,000
Pension obligations carved out and assigned to the buyer	24,400,000					(28,568,000)						(10,361,000)
Postretirement obligations carved out and assigned to the buyer	7,400,000					(19,619,000)
Pension assets carved out and assigned to the buyer	17,700,000
Decrease on gain on sale of marine business		2,400,000
Discount rate						4.28%	5.31%		4.25%			3.95%	5.05%		3.95%
Expected return on asset assumption based on a review of its historical long-term return experience						8.31%	8.27%	8.17%
Increase in pension and postretirement obligations						17,500,000										1,400,000
Increase in other postretirement obligations												900,000
Ultimate healthcare trend rate			8.50%									5.00%	5.00%	5.00%
Increase trend rate by 1%, increase the benefit expenses			200,000
Increase trend rate by 1%, increase the benefit obligation			4,000,000
Decrease trend rate by 1%, decrease the benefit expenses			200,000
Decrease trend rate by 1%, decrease the benefit obligation			3,500,000
Accumulated benefit obligation										393,400,000	353,700,000
Accumulated benefit obligations in excess of plan assets, projected benefit obligation		393,000,000	393,000,000	353,300,000
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation		392,700,000	392,700,000	353,000,000
Accumulated benefit obligations in excess of plan assets, fair value of plan assets		242,600,000	242,600,000	261,200,000
Target allocation percentage of equity securities			60.00%
Target allocation percentage of other securities			10.00%
Target allocation percentage of fixed-income securities			30.00%
Expected employer contribution for year 2011										19,500,000						3,200,000
Defined benefit plans, annual average Medicare part D subsidy			300,000
Defined contribution plans, costs			$ 10,600,000	$ 9,500,000	$ 9,200,000