Restructuring Restructuring Expected Costs, Cost Recognized, and Remaining Costs to be Recognized - 2011 Projects (Details) (USD $)	12 Months Ended								15 Months Ended	12 Months Ended	15 Months Ended	12 Months Ended	15 Months Ended	12 Months Ended	15 Months Ended	12 Months Ended	15 Months Ended	12 Months Ended	15 Months Ended	12 Months Ended	15 Months Ended	12 Months Ended	15 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Employee severance costs	Dec. 31, 2013 Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]	Dec. 31, 2013 Other restructuring costs	Dec. 31, 2013 2011 Project [Member]	Dec. 31, 2012 2011 Project [Member]	Dec. 31, 2012 2011 Project [Member]	Dec. 31, 2013 2011 Project [Member] Electricity Operating Segment [Member]	Dec. 31, 2012 2011 Project [Member] Electricity Operating Segment [Member]	Dec. 31, 2013 2011 Project [Member] Gas Operating Segment [Member]	Dec. 31, 2012 2011 Project [Member] Gas Operating Segment [Member]	Dec. 31, 2013 2011 Project [Member] Water Operating Segment [Member]	Dec. 31, 2012 2011 Project [Member] Water Operating Segment [Member]	Dec. 31, 2013 2011 Project [Member] Corporate, Non-Segment [Member]	Dec. 31, 2012 2011 Project [Member] Corporate, Non-Segment [Member]	Dec. 31, 2013 2011 Project [Member] Employee severance costs	Dec. 31, 2012 2011 Project [Member] Employee severance costs	Dec. 31, 2013 2011 Project [Member] Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]	Dec. 31, 2012 2011 Project [Member] Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]	Dec. 31, 2013 2011 Project [Member] Other restructuring costs	Dec. 31, 2012 2011 Project [Member] Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost							$ 74,145,000			$ 28,805,000		$ 24,580,000		$ 15,675,000		$ 5,085,000		$ 46,850,000		$ 20,332,000		$ 6,963,000
Restructuring costs recognized in prior periods									69,747,000		27,712,000		25,478,000		14,556,000		2,001,000		44,196,000		20,305,000		5,246,000
Restructuring Charges	35,497,000	1,665,000	68,082,000	31,840,000	1,259,000	2,398,000	4,398,000	1,700,000		1,093,000		(898,000)		1,119,000		3,084,000		2,654,000		27,000		1,717,000
Restructuring and Related Cost, Expected Cost Remaining							$ 0			$ 0		$ 0		$ 0		$ 0		$ 0		$ 0		$ 0