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Significant Segment Financial Data (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | $ 68.8 | $ 69.5 | $ 183.0 | $ 184.9 |
Segment Profit (Loss) | (0.4) | (0.8) | 8.6 | 7.9 |
Capital Expenditures | 14.8 | 14.3 | 23.9 | 25.1 |
Segment Assets | 768.3 | 727.6 | 768.3 | 727.6 | 800.2
Electricity |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 44.8 | 42.9 | 93.5 | 91.1 |
Segment Profit (Loss) | 1.4 | 1.6 | 2.6 | 3.3 |
Capital Expenditures | 4.1 | 4.5 | 9.4 | 9.8 |
Segment Assets | 377.7 | 364.5 | 377.7 | 364.5 |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 22.7 | 25.2 | 86.9 | 91.1 |
Segment Profit (Loss) | (2.2) | (3.0) | 5.4 | 3.8 |
Capital Expenditures | 10.0 | 8.8 | 13.1 | 14.0 |
Segment Assets | 380.2 | 350.5 | 380.2 | 350.5 |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | 0.1 | 0.1 |  | (0.1) |
Capital Expenditures | 0.7 | 1.0 | 1.4 | 1.3 |
Segment Assets | 3.4 | 6.0 | 3.4 | 6.0 |
Unregulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 1.3 | 1.4 | 2.6 | 2.7 |
Segment Profit (Loss) | 0.3 | 0.5 | 0.6 | 0.9 |
Segment Assets | $ 7.0 | $ 6.6 | $ 7.0 | $ 6.6 |

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