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Significant Segment Financial Data (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | $ 66.4 | $ 68.8 | $ 184.6 | $ 183.0 |
Segment Profit (Loss) | (0.1) | (0.4) | 10.7 | 8.6 |
Capital Expenditures | 22.6 | 14.8 | 37.0 | 23.9 |
Segment Assets | 874.2 | 824.7 | 874.2 | 824.7 | 892.3
Electricity |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 42.9 | 44.8 | 88.8 | 93.5 |
Segment Profit (Loss) | 1.4 | 1.4 | 3.4 | 2.6 |
Capital Expenditures | 3.4 | 4.1 | 10.4 | 9.4 |
Segment Assets | 405.7 | 398.3 | 405.7 | 398.3 |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 22.1 | 22.7 | 92.9 | 86.9 |
Segment Profit (Loss) | (2.3) | (2.2) | 6.0 | 5.4 |
Capital Expenditures | 17.6 | 10.0 | 24.5 | 13.1 |
Segment Assets | 456.8 | 416.1 | 456.8 | 416.1 |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | 0.6 | 0.1 | 0.7 |  |
Capital Expenditures | 1.6 | 0.7 | 2.1 | 1.4 |
Segment Assets | 5.3 | 3.3 | 5.3 | 3.3 |
Unregulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 1.4 | 1.3 | 2.9 | 2.6 |
Segment Profit (Loss) | 0.2 | 0.3 | 0.6 | 0.6 |
Segment Assets | $ 6.4 | $ 7.0 | $ 6.4 | $ 7.0 |

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