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Significant Segment Financial Data (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues $ 98.8 $ 71.3 $ 68.8 $ 114.2 $ 94.7 $ 73.2 $ 69.5 $ 115.4 $ 353.1 $ 352.8 $ 358.4
Interest Income                 3.7 1.4 4.0
Interest Expense                 21.8 21.8 22.1
Depreciation & Amortization Expense                 35.1 29.3 28.9
Income Tax Expense                 11.0 10.0 4.5
Segment Profit 9.0 0.5 (0.4) 9.0 10.0 (1.6) (0.8) 8.7 18.1 16.3 9.5
Segment Assets 886.6       846.7       886.6 846.7 800.4
Capital Expenditures                 68.5 57.1 49.6
Electricity
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 187.0 188.1 203.7
Interest Income                 2.4 0.7 3.2
Interest Expense                 9.0 9.4 9.6
Depreciation & Amortization Expense                 18.0 14.2 13.9
Income Tax Expense                 4.8 5.2 3.7
Segment Profit                 7.6 7.8 8.0
Segment Assets 403.7       393.8       403.7 393.8 388.2
Capital Expenditures                 21.2 20.3 19.8
Gas Segment
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 160.6 159.2 150.1
Interest Income                 0.8 0.5 0.5
Interest Expense                 11.1 10.7 10.5
Depreciation & Amortization Expense                 15.7 13.6 14.2
Income Tax Expense                 5.8 4.3 (0.7)
Segment Profit                 8.9 6.7 1.4
Segment Assets 471.6       440.9       471.6 440.9 401.1
Capital Expenditures                 43.9 33.6 27.4
All Other Segments
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Interest Income                 0.4 0.1 0.2
Interest Expense                 1.7 1.7 2.0
Depreciation & Amortization Expense                 1.4 1.5 0.8
Income Tax Expense                 (0.5) (0.6) 0.5
Segment Profit                 0.3 0.1 (1.4)
Segment Assets 5.6       6.5       5.6 6.5 5.7
Capital Expenditures                 3.4 3.2 2.4
Unregulated Operation
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 5.5 5.5 4.6
Interest Income                 0.1 0.1 0.1
Income Tax Expense                 0.9 1.1 1.0
Segment Profit                 1.3 1.7 1.5
Segment Assets $ 5.7       $ 5.5       $ 5.7 $ 5.5 $ 5.4