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Segment Information - Significant Segment Financial Data (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operation and Maintenance $ 77.6 $ 75.6 $ 73.7
Depreciation and Amortization 76.1 67.4 62.6
Interest Income (8.4) (6.2) (2.8)
Interest Expense 37.7 34.9 28.3
Provision for Income Taxes 14.0 13.2 11.2
Segment Assets 1,794.5 1,670.4  
Capital Expenditures 169.9 141.0 122.1
Operating Segments [Member] | Electric      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 248.3 306.5 297.9
Energy Supply Costs 141.0 202.4 199.1
Operation and Maintenance 34.9 34.5 33.5
Depreciation and Amortization 29.3 26.0 25.4
Other Segment Expenses (Income) 12.9 13.1 12.9
Interest Income (3.6) (2.6) (0.9)
Interest Expense 13.4 11.2 9.1
Provision for Income Taxes 3.8 4.0 3.1
Net Income Attributable to Commons Shares 16.6 17.9 15.7
Segment Assets 647.2 612.6 580.9
Capital Expenditures 61.8 44.2 33.8
Operating Segments [Member] | Gas Segment      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 246.5 250.6 265.3
Energy Supply Costs 79.6 96.1 121.4
Operation and Maintenance 41.7 40.7 40.1
Depreciation and Amortization 46.8 40.4 36.3
Other Segment Expenses (Income) 17.3 16.9 17.0
Interest Income (4.6) (2.4) (1.0)
Interest Expense 23.7 20.7 16.8
Provision for Income Taxes 11.2 9.4 8.2
Net Income Attributable to Commons Shares 30.8 28.8 26.5
Segment Assets 1,115.3 1,031.8 988.8
Capital Expenditures 103.9 92.7 87.6
Operating Segments [Member] | Total Reportable Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 494.8 557.1 563.2
Energy Supply Costs 220.6 298.5 320.5
Operation and Maintenance 76.6 75.2 73.6
Depreciation and Amortization 76.1 66.4 61.7
Other Segment Expenses (Income) 30.2 30.0 29.9
Interest Income (8.2) (5.0) (1.9)
Interest Expense 37.1 31.9 25.9
Provision for Income Taxes 15.0 13.4 11.3
Net Income Attributable to Commons Shares 47.4 46.7 42.2
Segment Assets 1,762.5 1,644.4 1,569.7
Capital Expenditures 165.7 136.9 121.4
Operating Segments [Member] | Other      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 0.0 0.0 0.0
Energy Supply Costs 0.0 0.0 0.0
Operation and Maintenance 1.0 0.4 0.1
Depreciation and Amortization 0.0 1.0 0.9
Other Segment Expenses (Income) (0.1) (1.5) (1.6)
Interest Income (0.2) (1.2) (0.9)
Interest Expense 0.6 3.0 2.4
Provision for Income Taxes (1.0) (0.2) (0.1)
Net Income Attributable to Commons Shares (0.3) (1.5) (0.8)
Segment Assets 32.0 26.0 20.7
Capital Expenditures 4.2 4.1 0.7
Operating Segments [Member] | Total [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total Operating Revenues 494.8 557.1 563.2
Energy Supply Costs 220.6 298.5 320.5
Operation and Maintenance 77.6 75.6 73.7
Depreciation and Amortization 76.1 67.4 62.6
Other Segment Expenses (Income) 30.1 28.5 28.3
Interest Income (8.4) (6.2) (2.8)
Interest Expense 37.7 34.9 28.3
Provision for Income Taxes 14.0 13.2 11.2
Net Income Attributable to Commons Shares 47.1 45.2 41.4
Segment Assets 1,794.5 1,670.4 1,590.4
Capital Expenditures $ 169.9 $ 141.0 $ 122.1