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Significant Segment Financial Data (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | $ 71.3 | $ 73.2 | $ 254.3 | $ 258.1 |
Segment Profit | 0.5 | (1.6) | 9.1 | 6.3 |
Capital Expenditures | 23.5 | 17.6 | 47.4 | 42.7 |
Segment Assets | 784.0 | 748.7 | 784.0 | 748.7 | 800.2
Electricity |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 49.5 | 50.5 | 143.0 | 141.6 |
Segment Profit | 2.5 | 2.3 | 5.1 | 5.6 |
Capital Expenditures | 6.1 | 6.7 | 15.5 | 16.5 |
Segment Assets | 377.9 | 368.9 | 377.9 | 368.9 |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 20.3 | 21.2 | 107.2 | 112.3 |
Segment Profit | (2.4) | (4.2) | 3.0 | (0.4) |
Capital Expenditures | 16.8 | 9.9 | 29.9 | 23.9 |
Segment Assets | 394.1 | 367.5 | 394.1 | 367.5 |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit |  | (0.1) |  | (0.2) |
Capital Expenditures | 0.6 | 1.0 | 2.0 | 2.3 |
Segment Assets | 5.8 | 6.4 | 5.8 | 6.4 |
Unregulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 1.5 | 1.5 | 4.1 | 4.2 |
Segment Profit | 0.4 | 0.4 | 1.0 | 1.3 |
Segment Assets | $ 6.2 | $ 5.9 | $ 6.2 | $ 5.9 |

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