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Consolidated Statements of Earnings (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Revenues:      
Gas $ 201,400,000us-gaap_RegulatedOperatingRevenueGas $ 170,400,000us-gaap_RegulatedOperatingRevenueGas $ 160,600,000us-gaap_RegulatedOperatingRevenueGas
Electric 218,700,000us-gaap_RegulatedOperatingRevenueElectricNonNuclear 190,700,000us-gaap_RegulatedOperatingRevenueElectricNonNuclear 187,000,000us-gaap_RegulatedOperatingRevenueElectricNonNuclear
Other 5,700,000us-gaap_OtherSalesRevenueNet 5,800,000us-gaap_OtherSalesRevenueNet 5,500,000us-gaap_OtherSalesRevenueNet
Total Operating Revenues 425,800,000us-gaap_RegulatedAndUnregulatedOperatingRevenue 366,900,000us-gaap_RegulatedAndUnregulatedOperatingRevenue 353,100,000us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating Expenses:      
Cost of Gas Sales 104,000,000us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased 85,200,000us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased 84,400,000us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
Cost of Electric Sales 137,900,000us-gaap_UtilitiesOperatingExpensePurchasedPower 114,500,000us-gaap_UtilitiesOperatingExpensePurchasedPower 115,100,000us-gaap_UtilitiesOperatingExpensePurchasedPower
Operation and Maintenance 64,600,000us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations 60,200,000us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations 56,100,000us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations
Depreciation and Amortization 42,100,000us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization 38,500,000us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization 36,000,000us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Taxes Other Than Income Taxes 17,200,000us-gaap_UtilitiesOperatingExpenseTaxes 15,000,000us-gaap_UtilitiesOperatingExpenseTaxes 14,000,000us-gaap_UtilitiesOperatingExpenseTaxes
Total Operating Expenses 365,800,000us-gaap_UtilitiesOperatingExpense 313,400,000us-gaap_UtilitiesOperatingExpense 305,600,000us-gaap_UtilitiesOperatingExpense
Operating Income 60,000,000us-gaap_OperatingIncomeLoss 53,500,000us-gaap_OperatingIncomeLoss 47,500,000us-gaap_OperatingIncomeLoss
Interest Expense, net 20,900,000us-gaap_InterestIncomeExpenseNonoperatingNet 18,800,000us-gaap_InterestIncomeExpenseNonoperatingNet 18,100,000us-gaap_InterestIncomeExpenseNonoperatingNet
Other Expense (Income), net 400,000us-gaap_OtherNonoperatingIncomeExpense 400,000us-gaap_OtherNonoperatingIncomeExpense 200,000us-gaap_OtherNonoperatingIncomeExpense
Income Before Income Taxes 38,700,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 34,300,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 29,200,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Taxes 13,995,000us-gaap_IncomeTaxExpenseBenefit 12,652,000us-gaap_IncomeTaxExpenseBenefit 10,976,000us-gaap_IncomeTaxExpenseBenefit
Net Income 24,700,000us-gaap_NetIncomeLoss 21,600,000us-gaap_NetIncomeLoss 18,200,000us-gaap_NetIncomeLoss
Less Dividends on Preferred Stock     100,000us-gaap_DividendsPreferredStock
Earnings Applicable to Common Shareholders $ 24,700,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 21,600,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 18,100,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per Common Share-Basic and Diluted $ 1.79us-gaap_EarningsPerShareBasicAndDiluted $ 1.57us-gaap_EarningsPerShareBasicAndDiluted $ 1.43us-gaap_EarningsPerShareBasicAndDiluted
Weighted Average Common Shares Outstanding-(Basic and Diluted) 13.8us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 13.8us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 12.7us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted