Restructuring Restructuring Expected Costs, Costs To-Date, Remaining Costs, and Costs During the Period (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			$ 89,003,000
Costs recognized in prior periods			68,082,000
Costs recognized during the period ended	7,720,000	1,907,000	8,509,000	1,907,000
Remaining costs to be recognized at period end			12,412,000
Employee severance costs [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			52,617,000
Costs recognized in prior periods			42,530,000
Costs recognized during the period ended			3,880,000
Remaining costs to be recognized at period end			6,207,000
Asset impairments [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			28,437,000
Costs recognized in prior periods			25,144,000
Costs recognized during the period ended			1,487,000
Remaining costs to be recognized at period end			1,806,000
Other restructuring costs [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			7,949,000
Costs recognized in prior periods			408,000
Costs recognized during the period ended			3,142,000
Remaining costs to be recognized at period end			4,399,000
Energy [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			62,292,000
Costs recognized in prior periods			51,873,000
Costs recognized during the period ended			3,754,000
Remaining costs to be recognized at period end			6,665,000
Water [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			21,240,000
Costs recognized in prior periods			15,321,000
Costs recognized during the period ended			4,120,000
Remaining costs to be recognized at period end			1,799,000
Corporate Unallocated [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			5,471,000
Costs recognized in prior periods			888,000
Costs recognized during the period ended			635,000
Remaining costs to be recognized at period end			$ 3,948,000