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Discontinued Operations and Assets and Liabilities Held for Sale (Assets and Liabilities of Discontinued Operations and Held for Sale) (Details) (USD $)
In Millions |
Jun. 30, 2011
|
Dec. 31, 2010
|
|---|---|---|
| Property, plant and equipment | $ 2.3 | $ 7.9 |
| Other assets | ||
| Total assets of discontinued operations and held for sale | 2.3 | 7.9 |
| Total liabilities of discontinued operations and held for sale | 0 | |
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Ni Source Corporate Services [Member]
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| Property, plant and equipment | 5.6 | |
| Other assets | ||
| Total assets of discontinued operations and held for sale | 5.6 | |
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Columbia Transmission [Member]
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| Property, plant and equipment | 2.3 | 2.3 |
| Other assets | ||
| Total assets of discontinued operations and held for sale | $ 2.3 | $ 2.3 |