Segment Information Major Customers (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	For the three months ended March 31, 2015 and March 31, 2014, no single customer represented more than 10% of total Company or the Electricity, Gas, or Water operating segment revenues.
Revenue [Member] | Threshold for Reporting Customer Concentration [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	10.00%