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Significant Segment Financial Data (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenues | $ 156.1 | $ 118.2 |
Segment Profit | 12.6 | 10.8 |
Identifiable Segment Assets | 928.0 | 885.5 | 920.6
Capital Expenditures | 9.2 | 14.4 |
Electricity |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenues | 61.9 | 45.9 |
Segment Profit | 0.9 | 2.0 |
Identifiable Segment Assets | 405.1 | 411.5 | 502.3
Capital Expenditures | 5.1 | 7.0 |
Gas Segment |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenues | 92.6 | 70.8 |
Segment Profit | 11.5 | 8.3 |
Identifiable Segment Assets | 506.1 | 462.2 | 402.8
Capital Expenditures | 3.0 | 6.9 |
All Other Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment Profit |  | 0.1 |
Identifiable Segment Assets | 11.0 | 5.5 | 6.2
Capital Expenditures | 1.0 | 0.5 |
Unregulated Operation |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenues | 1.6 | 1.5 |
Segment Profit | 0.2 | 0.4 |
Identifiable Segment Assets | 5.8 | 6.3 | 9.3
Capital Expenditures | $ 0.1 |  |

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