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Other Jefferson County Public Utility District (Details) (Jefferson County Public Utility District [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Jefferson County Public Utility District [Member]
Significant Acquisitions and Disposals [Line Items]
Property, Plant and Equipment, Net Book Value	$ 46.4
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax	$ 61.8

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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