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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Operating Revenues:        
Gas utility $ 847.0us-gaap_RegulatedOperatingRevenueGas $ 634.4us-gaap_RegulatedOperatingRevenueGas $ 1,428.4us-gaap_RegulatedOperatingRevenueGas $ 1,069.6us-gaap_RegulatedOperatingRevenueGas
Gas marketing and other 30.4lg_NonRegulatedGasMarketingOperatingRevenues 60.1lg_NonRegulatedGasMarketingOperatingRevenues 68.6lg_NonRegulatedGasMarketingOperatingRevenues 93.5lg_NonRegulatedGasMarketingOperatingRevenues
Total Operating Revenues 877.4us-gaap_RegulatedAndUnregulatedOperatingRevenue 694.5us-gaap_RegulatedAndUnregulatedOperatingRevenue 1,497.0us-gaap_RegulatedAndUnregulatedOperatingRevenue 1,163.1us-gaap_RegulatedAndUnregulatedOperatingRevenue
Gas utility        
Natural and propane gas 482.8us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased 405.3us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased 787.1us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased 647.1us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
Other operation and maintenance expenses 103.8us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses 72.0us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses 200.9us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses 134.3us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
Depreciation and amortization 32.2us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization 20.1us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization 64.2us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization 40.1us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Taxes, other than income taxes 55.7us-gaap_UtilitiesOperatingExpenseTaxes 41.8us-gaap_UtilitiesOperatingExpenseTaxes 93.7us-gaap_UtilitiesOperatingExpenseTaxes 70.4us-gaap_UtilitiesOperatingExpenseTaxes
Total Gas Utility Operating Expenses 674.5us-gaap_UtilitiesOperatingExpense 539.2us-gaap_UtilitiesOperatingExpense 1,145.9us-gaap_UtilitiesOperatingExpense 891.9us-gaap_UtilitiesOperatingExpense
Gas marketing and other 45.2lg_NonRegulatedGasMarketingandOtherOperatingExpenses 68.1lg_NonRegulatedGasMarketingandOtherOperatingExpenses 106.1lg_NonRegulatedGasMarketingandOtherOperatingExpenses 121.1lg_NonRegulatedGasMarketingandOtherOperatingExpenses
Total Operating Expenses 719.7us-gaap_CostsAndExpenses 607.3us-gaap_CostsAndExpenses 1,252.0us-gaap_CostsAndExpenses 1,013.0us-gaap_CostsAndExpenses
Operating Income 157.7us-gaap_OperatingIncomeLoss 87.2us-gaap_OperatingIncomeLoss 245.0us-gaap_OperatingIncomeLoss 150.1us-gaap_OperatingIncomeLoss
Other Income – Net 0.7us-gaap_NonoperatingIncomeExpense (0.3)us-gaap_NonoperatingIncomeExpense 2.1us-gaap_NonoperatingIncomeExpense 1.4us-gaap_NonoperatingIncomeExpense
Interest Charges:        
Interest on long-term debt 16.5us-gaap_InterestExpenseLongTermDebt 8.6us-gaap_InterestExpenseLongTermDebt 33.7us-gaap_InterestExpenseLongTermDebt 18.3us-gaap_InterestExpenseLongTermDebt
Other interest charges 2.6us-gaap_InterestExpenseDebt 0.7us-gaap_InterestExpenseDebt 4.6us-gaap_InterestExpenseDebt 1.5us-gaap_InterestExpenseDebt
Total Interest Charges 19.1us-gaap_InterestExpense 9.3us-gaap_InterestExpense 38.3us-gaap_InterestExpense 19.8us-gaap_InterestExpense
Income Before Income Taxes 139.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 77.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 208.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 131.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Tax Expense 44.9us-gaap_IncomeTaxExpenseBenefit 25.4us-gaap_IncomeTaxExpenseBenefit 67.3us-gaap_IncomeTaxExpenseBenefit 43.9us-gaap_IncomeTaxExpenseBenefit
Net Income 94.4us-gaap_NetIncomeLoss 52.2us-gaap_NetIncomeLoss 141.5us-gaap_NetIncomeLoss 87.8us-gaap_NetIncomeLoss
Weighted Average Number of Common Shares Outstanding:        
Basic (in shares) 43.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 43.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 43.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32.6us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic Earnings Per Share of Common Stock (in dollars per share) $ 2.18us-gaap_EarningsPerShareBasic $ 1.59us-gaap_EarningsPerShareBasic $ 3.27us-gaap_EarningsPerShareBasic $ 2.68us-gaap_EarningsPerShareBasic
Diluted Earnings Per Share of Common Stock (in dollars per share) $ 2.18us-gaap_EarningsPerShareDiluted $ 1.59us-gaap_EarningsPerShareDiluted $ 3.26us-gaap_EarningsPerShareDiluted $ 2.68us-gaap_EarningsPerShareDiluted
Dividends Declared, Common stock (in dollars per share) $ 0.46us-gaap_CommonStockDividendsPerShareDeclared $ 0.44us-gaap_CommonStockDividendsPerShareDeclared $ 0.92us-gaap_CommonStockDividendsPerShareDeclared $ 0.88us-gaap_CommonStockDividendsPerShareDeclared
Laclede Gas        
Operating Revenues:        
Gas utility 615.7us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
638.7us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
1,078.1us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
1,073.9us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Other 0lg_Other
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
0.1lg_Other
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
0lg_Other
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
0.1lg_Other
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Total Operating Revenues 615.7us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
638.8us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
1,078.1us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
1,074.0us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Gas utility        
Natural and propane gas 402.7us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
430.5us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
686.1us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
692.1us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Other operation and maintenance expenses 69.6us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
72.2us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
134.4us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
134.7us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Depreciation and amortization 20.5us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
20.1us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
40.7us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
40.1us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Taxes, other than income taxes 42.3us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
41.8us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
71.5us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
70.4us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Total Gas Utility Operating Expenses 535.1us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
564.6us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
932.7us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
937.3us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Gas marketing and other 0lg_NonRegulatedGasMarketingandOtherOperatingExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
(0.3)lg_NonRegulatedGasMarketingandOtherOperatingExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
0lg_NonRegulatedGasMarketingandOtherOperatingExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
(0.1)lg_NonRegulatedGasMarketingandOtherOperatingExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Total Operating Expenses 535.1us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
564.3us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
932.7us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
937.2us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Operating Income 80.6us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
74.5us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
145.4us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
136.8us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Other Income – Net 0.4us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
(0.7)us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
1.3us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
1.0us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Interest Charges:        
Interest on long-term debt 8.3us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
8.4us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
16.6us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
17.9us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Other interest charges 1.2us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
0.7us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
2.2us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
1.5us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Total Interest Charges 9.5us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
9.1us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
18.8us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
19.4us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Income Before Income Taxes 71.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
64.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
127.9us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
118.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Income Tax Expense 21.6us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
20.5us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
39.0us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
38.9us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Net Income 49.9us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
44.2us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
88.9us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
79.5us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_LacledeGasCompanyMember
Alagasco        
Operating Revenues:        
Gas utility 233.3us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
263.9us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
353.3us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
406.7us-gaap_RegulatedOperatingRevenueGas
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Total Operating Revenues 233.3us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
263.9us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
353.3us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
406.7us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Gas utility        
Natural and propane gas 96.4us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
128.1us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
142.8us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
180.1us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Other operation and maintenance expenses 34.4us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
36.2us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
67.0us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
71.7us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Depreciation and amortization 11.7us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
11.4us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
23.5us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
22.6us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Taxes, other than income taxes 13.4us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
15.8us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
22.2us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
25.1us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Total Operating Expenses 155.9us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
191.5us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
255.5us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
299.5us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Operating Income 77.4us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
72.4us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
97.8us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
107.2us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Other Income – Net 0.6us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
1.2us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
1.0us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
1.9us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Interest Charges:        
Interest on long-term debt 2.8us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
3.4us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
6.0us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
6.8us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Other interest charges 0.7us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
0.6us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
1.3us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
1.1us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Total Interest Charges 3.5us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
4.0us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
7.3us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
7.9us-gaap_InterestExpense
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Income Before Income Taxes 74.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
69.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
91.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
101.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Income Tax Expense 28.2us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
26.5us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
34.6us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
38.3us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
Net Income $ 46.3us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
$ 43.1us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
$ 56.9us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember
$ 62.9us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= lg_AlabamaGasCorporationMember