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Business Segment Information (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
| Segment Reporting Information [Line Items] | ||||
| Revenues | $ 1,212.3 | $ 1,038.8 | $ 3,006.6 | $ 2,687.0 |
| Consolidated Operating Income (Loss) | 193.5 | 205.0 | 621.6 | 602.0 |
|
Gas Distribution Operations [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 572.4 | 443.9 | 1,717.5 | 1,504.2 |
| Consolidated Operating Income (Loss) | 50.0 | 43.4 | 284.1 | 253.0 |
|
Gas Distribution Operations [Member] | Unaffiliated [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 572.4 | 443.8 | 1,717.3 | 1,503.9 |
|
Gas Distribution Operations [Member] | Intersegment [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 0 | 0.1 | 0.2 | 0.3 |
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Columbia Pipeline Group Operations [Member]
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 273.8 | 241.0 | 575.2 | 516.4 |
| Consolidated Operating Income (Loss) | 88.8 | 91.5 | 222.3 | 230.1 |
|
Columbia Pipeline Group Operations [Member] | Unaffiliated [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 242.3 | 209.5 | 500.7 | 442.5 |
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Columbia Pipeline Group Operations [Member] | Intersegment [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 31.5 | 31.5 | 74.5 | 73.9 |
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Electric Operations [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 385.1 | 377.4 | 762.7 | 730.5 |
| Consolidated Operating Income (Loss) | 59.5 | 70.3 | 124.7 | 116.5 |
|
Electric Operations [Member] | Unaffiliated [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 384.9 | 377.2 | 762.3 | 730.1 |
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Electric Operations [Member] | Intersegment [Member]
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 0.2 | 0.2 | 0.4 | 0.4 |
|
Corporate/Other [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 122.7 | 123.6 | 258.0 | 236.5 |
| Consolidated Operating Income (Loss) | (4.8) | (0.2) | (9.5) | 2.4 |
|
Corporate/Other [Member] | Unaffiliated [Member]
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 12.7 | 8.3 | 26.3 | 10.5 |
|
Corporate/Other [Member] | Intersegment [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | 110.0 | 115.3 | 231.7 | 226.0 |
|
Eliminations [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Revenues | $ (141.7) | $ (147.1) | $ (306.8) | $ (300.6) |