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Significant Segment Financial Data (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Other Operating Revenue – Non-Regulated $ 0.0 $ 0.0   $ 0.9  
Total Operating Revenues 87.4 85.3 $ 301.7 321.8  
Segment Profit (Loss) 0.3 2.3 18.6 32.8  
Capital Expenditures 44.8 38.0 93.6 76.7  
Segment Assets 1,423.9 1,309.7 1,423.9 1,309.7 $ 1,370.8
Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 80.8 77.8 304.4 332.8  
Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 6.6 7.5 (2.7) (11.9)  
Gas Segment          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 27.5 24.9 131.4 143.9  
Segment Profit (Loss) (3.6) (3.9) 8.6 10.1  
Capital Expenditures 27.4 26.9 50.0 48.3  
Segment Assets 845.0 780.7 845.0 780.7  
Gas Segment | Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 20.0 20.5 130.9 160.0  
Gas Segment | Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 7.5 4.4 0.5 (16.1)  
Electric          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 59.9 60.4 170.3 177.0  
Segment Profit (Loss) 4.4 4.4 10.1 9.7  
Capital Expenditures 16.0 9.2 39.9 24.1  
Segment Assets 556.3 507.6 556.3 507.6  
Electric | Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 60.8 57.3 173.5 172.8  
Electric | Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (0.9) 3.1 (3.2) 4.2  
All Other Segments          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Segment Profit (Loss) (0.5) 1.8 (0.1) 2.8  
Capital Expenditures 1.4 1.9 3.7 4.3  
Segment Assets $ 22.6 21.1 $ 22.6 21.1  
Unregulated Operation          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Other Operating Revenue – Non-Regulated       0.9  
Total Operating Revenues       0.9  
Segment Profit (Loss)   0.0   10.2  
Segment Assets   $ 0.3   $ 0.3