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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