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Segment Information - Significant Segment Financial Data (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operation and Maintenance $ 22.6 $ 18.2  
Depreciation and Amortization 21.7 18.0  
Provision for Income Taxes 9.5 9.4  
Net income allocated to common shareholders 27.3    
Segment Assets 1,890.7 1,697.9 $ 1,794.5
Capital Expenditures 32.6 20.2  
Operating Segments [Member] | Electric      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 60.2 73.6  
Energy Supply Costs 32.7 46.5  
Operation and Maintenance 9.5 8.4  
Depreciation and Amortization 7.9 7.0  
Other Segment Expenses (Income) 3.2 3.3  
Interest Income (0.8) (0.8)  
Interest Expense 3.4 3.1  
Provision for Income Taxes 0.7 1.2  
Net income allocated to common shareholders 3.6 4.9  
Segment Assets 669.6 625.5  
Capital Expenditures 21.2 8.7  
Operating Segments [Member] | Gas Segment      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 110.6 105.1  
Energy Supply Costs 39.7 44.1  
Operation and Maintenance 12.1 9.8  
Depreciation and Amortization 13.8 10.8  
Other Segment Expenses (Income) 4.8 4.7  
Interest Income (0.8) (0.9)  
Interest Expense 6.1 6.0  
Provision for Income Taxes 9.4 8.2  
Net income allocated to common shareholders 25.5 22.4  
Segment Assets 1,188.5 1,043.7  
Capital Expenditures 11.4 10.7  
Operating Segments [Member] | Total Reportable Segments [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 170.8 178.7  
Energy Supply Costs 72.4 90.6  
Operation and Maintenance 21.6 18.2  
Depreciation and Amortization 21.7 17.8  
Other Segment Expenses (Income) 8.0 8.0  
Interest Income (1.6) (1.7)  
Interest Expense 9.5 9.1  
Provision for Income Taxes 10.1 9.4  
Net income allocated to common shareholders 29.1 27.3  
Segment Assets 1,858.1 1,669.2  
Capital Expenditures 32.6 19.4  
Operating Segments [Member] | All Other Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 0.0 0.0  
Energy Supply Costs 0.0 0.0  
Operation and Maintenance 1.0 0.0  
Depreciation and Amortization 0.0 0.2  
Other Segment Expenses (Income) 0.0 0.0  
Interest Income 0.0 (0.3)  
Interest Expense 1.2 0.2  
Provision for Income Taxes (0.6) 0.0  
Net income allocated to common shareholders (1.6) (0.1)  
Segment Assets 32.6 28.7  
Capital Expenditures 0.0 0.8  
Operating Segments [Member] | Total [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 170.8 178.7  
Energy Supply Costs 72.4 90.6  
Operation and Maintenance 22.6 18.2  
Depreciation and Amortization 21.7 18.0  
Other Segment Expenses (Income) 8.0 8.0  
Interest Income (1.6) (2.0)  
Interest Expense 10.7 9.3  
Provision for Income Taxes 9.5 9.4  
Net income allocated to common shareholders 27.5 27.2  
Segment Assets 1,890.7 1,697.9  
Capital Expenditures $ 32.6 $ 20.2