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Significant Segment Financial Data (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 78.8	$ 74.7	$ 279.1	$ 324.4
Segment Profit (Loss)	3.5	1.7	16.9	17.0
Capital Expenditures	34.8	32.1	74.4	70.6
Segment Assets	1,072.4	1,002.5	1,072.4	1,002.5	$ 1,038.8
Gas Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	22.1	21.7	124.1	149.6
Segment Profit (Loss)	(2.2)	(1.4)	7.2	9.5
Capital Expenditures	22.9	22.2	44.8	45.1
Segment Assets	610.3	573.2	610.3	573.2	590.9
Electricity
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	55.2	51.4	150.4	170.1
Segment Profit (Loss)	5.3	2.5	8.7	6.2
Capital Expenditures	8.8	7.8	21.8	19.5
Segment Assets	425.4	409.5	425.4	409.5	415.1
All Other Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Profit (Loss)	0.1	0.3	0.1	0.4
Capital Expenditures	3.1	2.1	7.8	5.9
Segment Assets	29.5	13.4	29.5	13.4	26.3
Unregulated Operation
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1.5	1.6	4.6	4.7
Segment Profit (Loss)	0.3	0.3	0.9	0.9
Capital Expenditures				0.1
Segment Assets	$ 7.2	$ 6.4	$ 7.2	$ 6.4	$ 6.5

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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 944
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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