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Significant Segment Financial Data (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 72.5	$ 71.3	$ 257.1	$ 254.3
Segment Profit (Loss)	0.6	0.5	11.3	9.1
Capital Expenditures	27.6	23.5	64.6	47.4
Segment Assets	895.2	841.9	895.2	841.9	892.3
Electricity
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	52.1	49.5	140.9	143.0
Segment Profit (Loss)	2.6	2.5	6.0	5.1
Capital Expenditures	6.1	6.1	16.5	15.5
Segment Assets	409.6	399.8	409.6	399.8
Gas Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	18.9	20.3	111.8	107.2
Segment Profit (Loss)	(1.9)	(2.4)	4.1	3.0
Capital Expenditures	20.1	16.8	44.6	29.9
Segment Assets	474.2	430.1	474.2	430.1
All Other Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Profit (Loss)	(0.4)		0.3
Capital Expenditures	1.4	0.6	3.5	2.0
Segment Assets	4.9	5.8	4.9	5.8
Unregulated Operation
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1.5	1.5	4.4	4.1
Segment Profit (Loss)	0.3	0.4	0.9	1.0
Segment Assets	$ 6.5	$ 6.2	$ 6.5	$ 6.2

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Subparagraph (SX 210.5-02.18)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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The total amount of operating revenues recognized during the period.

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