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STATEMENTS OF CONSOLIDATED INCOME (UNAUDITED) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating Revenues:    
Gas utility $ 581.4us-gaap_RegulatedOperatingRevenueGas $ 435.2us-gaap_RegulatedOperatingRevenueGas
Gas marketing and other 38.2lg_NonRegulatedGasMarketingOperatingRevenues 33.4lg_NonRegulatedGasMarketingOperatingRevenues
Total Operating Revenues 619.6us-gaap_RegulatedAndUnregulatedOperatingRevenue 468.6us-gaap_RegulatedAndUnregulatedOperatingRevenue
Gas utility    
Natural and propane gas 304.3us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased 241.8us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
Other operation and maintenance expenses 97.1us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses 62.3us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
Depreciation and amortization 32.0us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization 20.0us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Taxes, other than income taxes 38.0us-gaap_UtilitiesOperatingExpenseTaxes 28.6us-gaap_UtilitiesOperatingExpenseTaxes
Total Gas Utility Operating Expenses 471.4us-gaap_UtilitiesOperatingExpense 352.7us-gaap_UtilitiesOperatingExpense
Gas marketing and other 60.9lg_NonRegulatedGasMarketingandOtherOperatingExpenses 53.0lg_NonRegulatedGasMarketingandOtherOperatingExpenses
Total Operating Expenses 532.3us-gaap_CostsAndExpenses 405.7us-gaap_CostsAndExpenses
Operating Income 87.3us-gaap_OperatingIncomeLoss 62.9us-gaap_OperatingIncomeLoss
Other Income – Net 1.4us-gaap_NonoperatingIncomeExpense 1.7us-gaap_NonoperatingIncomeExpense
Interest Charges:    
Interest on long-term debt 17.2us-gaap_InterestExpenseLongTermDebt 9.7us-gaap_InterestExpenseLongTermDebt
Other interest charges 2.0us-gaap_InterestExpenseDebt 0.8us-gaap_InterestExpenseDebt
Total Interest Charges 19.2us-gaap_InterestExpense 10.5us-gaap_InterestExpense
Income Before Income Taxes 69.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 54.1us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Tax Expense 22.4us-gaap_IncomeTaxExpenseBenefit 18.5us-gaap_IncomeTaxExpenseBenefit
Net Income 47.1us-gaap_NetIncomeLoss 35.6us-gaap_NetIncomeLoss
Weighted Average Number of Common Stock Outstanding:    
Basic (in shares) 43.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 43.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32.6us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic Earnings Per Share of Common Stock (in dollars per share) $ 1.09us-gaap_EarningsPerShareBasic $ 1.09us-gaap_EarningsPerShareBasic
Diluted Earnings Per Share of Common Stock (in dollars per share) $ 1.09us-gaap_EarningsPerShareDiluted $ 1.09us-gaap_EarningsPerShareDiluted
Dividends Declared, Common stock (in dollars per share) $ 0.46us-gaap_CommonStockDividendsPerShareDeclared $ 0.44us-gaap_CommonStockDividendsPerShareDeclared
Laclede Gas    
Operating Revenues:    
Gas utility 462.4us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
435.2us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Total Operating Revenues 462.4us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
435.2us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Gas utility    
Natural and propane gas 283.4us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
261.6us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Other operation and maintenance expenses 64.8us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
62.5us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Depreciation and amortization 20.2us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
20.0us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Taxes, other than income taxes 29.2us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
28.6us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Total Gas Utility Operating Expenses 397.6us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
372.7us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Gas marketing and other 0lg_NonRegulatedGasMarketingandOtherOperatingExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
0.2lg_NonRegulatedGasMarketingandOtherOperatingExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Total Operating Expenses 397.6us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
372.9us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Operating Income 64.8us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
62.3us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Other Income – Net 0.9us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
1.7us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Interest Charges:    
Interest on long-term debt 8.3us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
9.5us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Other interest charges 1.0us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
0.8us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Total Interest Charges 9.3us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
10.3us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Income Before Income Taxes 56.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
53.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Income Tax Expense 17.4us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
18.4us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Net Income 39.0us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
35.3us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Alagasco    
Operating Revenues:    
Gas utility 120.0us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
142.8us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Total Operating Revenues 120.0us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
142.8us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Gas utility    
Natural and propane gas 46.4us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
52.0us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Other operation and maintenance expenses 32.6us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
35.5us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Depreciation and amortization 11.8us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
11.2us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Taxes, other than income taxes 8.8us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
9.3us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Total Gas Utility Operating Expenses 99.6us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
108.0us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Total Operating Expenses 99.6us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
108.0us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Operating Income 20.4us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
34.8us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Other Income – Net 0.4us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
0.7us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Interest Charges:    
Interest on long-term debt 3.2us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
3.2us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Other interest charges 0.6us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
0.7us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Total Interest Charges 3.8us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
3.9us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Income Before Income Taxes 17.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
31.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Income Tax Expense 6.4us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
11.8us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Net Income $ 10.6us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
$ 19.8us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember