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Segment Information - Significant Segment Financial Data (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues $ 95.7 $ 103.4 $ 274.4 $ 323.6  
Segment Profit (Loss) 4.3 4.2 31.5 28.3  
Capital Expenditures 36.7 35.4 56.9 57.6  
Segment Assets 1,695.0 1,595.3 1,695.0 1,595.3 $ 1,670.4
Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 105.8 115.1 277.1 334.6  
Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (10.1) (11.7) (2.7) (11.0)  
Gas Segment          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 39.3 38.9 144.4 150.9  
Segment Profit (Loss) 1.0 0.9 23.4 19.9  
Capital Expenditures 24.0 22.0 34.7 33.5  
Segment Assets 1,035.3 961.9 1,035.3 961.9  
Gas Segment | Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 47.0 45.3 147.3 167.2  
Gas Segment | Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (7.7) (6.4) (2.9) (16.3)  
Electric          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 56.4 64.5 130.0 172.7  
Segment Profit (Loss) 3.4 3.6 8.3 8.9  
Capital Expenditures 11.7 13.4 20.4 24.0  
Segment Assets 632.9 610.5 632.9 610.5  
Electric | Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 58.8 69.8 129.8 167.4  
Electric | Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (2.4) (5.3) 0.2 5.3  
All Other Segments          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Segment Profit (Loss) (0.1) (0.3) (0.2) (0.5)  
Capital Expenditures 1.0   1.8 0.1  
Segment Assets $ 26.8 $ 22.9 $ 26.8 $ 22.9