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Significant Segment Financial Data (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues $ 98.9 $ 96.6 $ 291.5 $ 235.4  
Segment Profit (Loss) 4.9 2.7 26.4 21.6  
Identifiable Segment Assets 1,547.1 1,477.1 1,547.1 1,477.1 $ 1,540.3
Capital Expenditures 29.9 28.4 45.3 42.5  
Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 113.7 96.3 312.1 255.3  
Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (14.8) 0.3 (20.6) (19.9)  
Gas Segment          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 44.6 40.0 148.0 118.7  
Segment Profit (Loss) 1.3 (0.2) 19.8 16.2  
Identifiable Segment Assets 936.0 878.3 936.0 878.3  
Capital Expenditures 22.0 18.9 31.0 23.2  
Gas Segment | Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 49.6 38.0 163.3 131.2  
Gas Segment | Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (5.0) 2.0 (15.3) (12.5)  
Electric          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 54.3 56.6 143.5 116.7  
Segment Profit (Loss) 3.9 3.4 7.3 6.3  
Identifiable Segment Assets 593.0 577.3 593.0 577.3  
Capital Expenditures 7.9 9.2 14.2 18.7  
Electric | Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 64.1 58.3 148.8 124.1  
Electric | Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (9.8) (1.7) (5.3) (7.4)  
All Other Segments          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Segment Profit (Loss) (0.3) (0.6) (0.7) (1.0)  
Identifiable Segment Assets 18.1 21.5 18.1 21.5  
Capital Expenditures 0.0 $ 0.3 $ 0.1 0.6  
Non- Regulated Operation          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Segment Profit (Loss) $ 0.1     $ 0.1