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Significant Segment Financial Data (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenues | $ 118.2 | $ 114.2 |
Segment Profit (Loss) | 10.8 | 9.0 |
Identifiable Segment Assets | 875.9 | 831.1 | 886.6
Capital Expenditures | 14.4 | 9.1 |
Electricity |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenues | 45.9 | 48.7 |
Segment Profit (Loss) | 2.0 | 1.2 |
Identifiable Segment Assets | 403.2 | 392.2 |
Capital Expenditures | 7.0 | 5.3 |
Gas Segment |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenues | 70.8 | 64.2 |
Segment Profit (Loss) | 8.3 | 7.6 |
Identifiable Segment Assets | 460.9 | 426.2 |
Capital Expenditures | 6.9 | 3.1 |
All Other Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment Profit (Loss) | 0.1 | (0.1) |
Identifiable Segment Assets | 5.5 | 6.2 |
Capital Expenditures | 0.5 | 0.7 |
Unregulated Operation |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenues | 1.5 | 1.3 |
Segment Profit (Loss) | 0.4 | 0.3 |
Identifiable Segment Assets | $ 6.3 | $ 6.5 |

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