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Significant Segment Financial Data (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Revenues $ 73.3 $ 66.4 $ 229.4 $ 184.6  
Segment Profit (Loss) 1.1 (0.1) 13.7 10.7  
Capital Expenditures 19.9 22.6 29.1 37.0  
Identifiable Segment Assets 900.6 874.2 900.6 874.2 920.6
Electricity
          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Revenues 46.1 42.9 108.0 88.8  
Segment Profit (Loss) 1.4 1.4 2.3 3.4  
Capital Expenditures 5.0 3.4 10.1 10.4  
Identifiable Segment Assets 391.6 405.7 391.6 405.7 502.3
Gas Segment
          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Revenues 25.8 22.1 118.4 92.9  
Segment Profit (Loss) (0.7) (2.3) 10.8 6.0  
Capital Expenditures 13.3 17.6 16.3 24.5  
Identifiable Segment Assets 490.6 456.8 490.6 456.8 402.8
All Other Segments
          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Segment Profit (Loss) 0.2 0.6 0.2 0.7  
Capital Expenditures 1.4 1.6 2.4 2.1  
Identifiable Segment Assets 12.3 5.3 12.3 5.3 6.2
Unregulated Operation
          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Revenues 1.4 1.4 3.0 2.9  
Segment Profit (Loss) 0.2 0.2 0.4 0.6  
Capital Expenditures 0.2   0.3    
Identifiable Segment Assets $ 6.1 $ 6.4 $ 6.1 $ 6.4 $ 9.3