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Significant Segment Financial Data (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues $ 192.6 $ 138.8  
Segment Profit (Loss) 21.5 18.9  
Identifiable Segment Assets 1,552.3 1,477.0 $ 1,540.3
Capital Expenditures 15.4 14.1  
Billed and Unbilled Revenue      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 198.4 159.0  
Rate Adjustment Mechanism Revenue      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues (5.8) (20.2)  
Gas Segment      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 103.4 78.7  
Segment Profit (Loss) 18.5 16.4  
Identifiable Segment Assets 932.6 881.1  
Capital Expenditures 9.0 4.3  
Gas Segment | Billed and Unbilled Revenue      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 113.7 93.2  
Gas Segment | Rate Adjustment Mechanism Revenue      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues (10.3) (14.5)  
Electric      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 89.2 60.1  
Segment Profit (Loss) 3.4 2.9  
Identifiable Segment Assets 598.2 574.8  
Capital Expenditures 6.3 9.5  
Electric | Billed and Unbilled Revenue      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 84.7 65.8  
Electric | Rate Adjustment Mechanism Revenue      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 4.5 (5.7)  
All Other Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Segment Profit (Loss) (0.4) (0.4)  
Identifiable Segment Assets 21.5 21.1  
Capital Expenditures $ 0.1 0.3  
Non- Regulated Operation      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Identifiable Segment Assets   $ 0.0