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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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