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Significant Segment Financial Data (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Revenues $ 76.6 $ 72.5 $ 306.0 $ 257.1  
Segment Profit (Loss) 1.6 0.6 15.3 11.3  
Capital Expenditures 31.6 27.6 60.7 64.6  
Identifiable Segment Assets 916.5 895.2 916.5 895.2 920.6
Electricity
          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Revenues 54.2 52.1 162.2 140.9  
Segment Profit (Loss) 2.9 2.6 5.2 6.0  
Capital Expenditures 7.1 6.1 17.2 16.5  
Identifiable Segment Assets 392.1 409.6 392.1 409.6 402.8
Gas Segment
          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Revenues 20.9 18.9 139.3 111.8  
Segment Profit (Loss) (1.5) (1.9) 9.3 4.1  
Capital Expenditures 23.1 20.1 39.4 44.6  
Identifiable Segment Assets 505.6 474.2 505.6 474.2 502.3
All Other Segments
          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Segment Profit (Loss)   (0.4) 0.2 0.3  
Capital Expenditures 1.3 1.4 3.7 3.5  
Identifiable Segment Assets 12.4 4.9 12.4 4.9 9.3
Unregulated Operation
          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Revenues 1.5 1.5 4.5 4.4  
Segment Profit (Loss) 0.2 0.3 0.6 0.9  
Capital Expenditures 0.1   0.4    
Identifiable Segment Assets $ 6.4 $ 6.5 $ 6.4 $ 6.5 $ 6.2