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Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013 Carthage Compressor Station Incident [Member]	Jun. 30, 2012 Carthage Compressor Station Incident [Member]	Jun. 30, 2012 Carthage Compressor Station Incident [Member]	Jun. 30, 2013 Gas Storage Sale [Member] MMcf
Schedule Of Asset Dispositions and Impairments [Line Items]
Gains (Losses) on Sales of Other Assets								$ 17.0
Volume Of Gas Sold (in mmcf)								5,000
Carrying Value Before Sale or Impairment								2.6
Other Asset Impairment Charges	1.1	2.9	1.2	7.1
Compressor Station Fire [Abstract]
Recovery of Direct Costs					1.7	10.0
Insured Event, Gain (Loss)						$ 1.2	$ 1.2

The excess or deficiency of insurance recoveries compared to the recorded loss incurred from an insured event (including a conversion of nonmonetary assets to monetary assets). An excess would occur from recovery of lost profits, and recoveries at current replacement cost less carrying amounts of assets that were damaged or destroyed. This element is (1) intended to be used whenever a relevant insurance event concept is needed and (2) moved to the portion of the income statement to correspond to the entity's classification as a component of operating results, nonoperating item, discontinued operations, or extraordinary item.

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