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Gas Gathering and Processing Acquisitions and Divestitures (Tables)
 12 Months Ended
Dec. 31, 2011
Business Combinations [Abstract]  
Schedule of Purchase Price Allocation [Table Text Block]
The acquisition described above was accounted for as a business combination. The following table summarizes the purchase price allocation for this acquisition.
(In millions)
 
Current assets
$
5.4

Net property, plant and equipment
24.3

Intangible assets
136.3

Goodwill
39.4

Current liabilities assumed
(5.0
)
Total
$
200.4