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Significant Segment Financial Data (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | $ 76.6 | $ 72.5 | $ 306.0 | $ 257.1 |
Segment Profit (Loss) | 1.6 | 0.6 | 15.3 | 11.3 |
Capital Expenditures | 31.6 | 27.6 | 60.7 | 64.6 |
Identifiable Segment Assets | 916.5 | 895.2 | 916.5 | 895.2 | 920.6
Electricity |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 54.2 | 52.1 | 162.2 | 140.9 |
Segment Profit (Loss) | 2.9 | 2.6 | 5.2 | 6.0 |
Capital Expenditures | 7.1 | 6.1 | 17.2 | 16.5 |
Identifiable Segment Assets | 392.1 | 409.6 | 392.1 | 409.6 | 402.8
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 20.9 | 18.9 | 139.3 | 111.8 |
Segment Profit (Loss) | (1.5) | (1.9) | 9.3 | 4.1 |
Capital Expenditures | 23.1 | 20.1 | 39.4 | 44.6 |
Identifiable Segment Assets | 505.6 | 474.2 | 505.6 | 474.2 | 502.3
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) |  | (0.4) | 0.2 | 0.3 |
Capital Expenditures | 1.3 | 1.4 | 3.7 | 3.5 |
Identifiable Segment Assets | 12.4 | 4.9 | 12.4 | 4.9 | 9.3
Unregulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 1.5 | 1.5 | 4.5 | 4.4 |
Segment Profit (Loss) | 0.2 | 0.3 | 0.6 | 0.9 |
Capital Expenditures | 0.1 |  | 0.4 |  |
Identifiable Segment Assets | $ 6.4 | $ 6.5 | $ 6.4 | $ 6.5 | $ 6.2

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