CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 18.0	$ 16.8
Accounts receivable and accrued unbilled revenues, net of reserves of $63.3 and $47.7, respectively	699.8us-gaap_ReceivablesNetCurrent	646.1us-gaap_ReceivablesNetCurrent
Inventories	327.2us-gaap_InventoryNet	218.9us-gaap_InventoryNet
Regulatory assets	118.9us-gaap_RegulatoryAssetsCurrent	127.4us-gaap_RegulatoryAssetsCurrent
Assets held for sale	0.7	277.9
Assets of discontinued operations related to IES's retail energy business	0teg_AssetsOfDiscontinuedOperations	815.4teg_AssetsOfDiscontinuedOperations
Deferred income taxes	52.4	31.4
Prepaid taxes	136.2us-gaap_PrepaidTaxes	144.4us-gaap_PrepaidTaxes
Other current assets	57.5us-gaap_OtherAssetsCurrent	55.9us-gaap_OtherAssetsCurrent
Current assets	1,410.7us-gaap_AssetsCurrent	2,334.2us-gaap_AssetsCurrent
Property, plant, and equipment, net of accumulated depreciation of $3,343.1 and $3,221.0, respectively	6,859.8us-gaap_PropertyPlantAndEquipmentNet	6,206.2us-gaap_PropertyPlantAndEquipmentNet
Regulatory assets	1,513.6us-gaap_RegulatoryAssetsNoncurrent	1,361.4us-gaap_RegulatoryAssetsNoncurrent
Equity method investments	572.4us-gaap_EquityMethodInvestments	540.9us-gaap_EquityMethodInvestments
Goodwill	655.4us-gaap_Goodwill	655.4us-gaap_Goodwill
Other long-term assets	270.1us-gaap_OtherAssetsNoncurrent	145.4us-gaap_OtherAssetsNoncurrent
Total assets	11,282.0us-gaap_Assets	11,243.5us-gaap_Assets
Liabilities and Equity
Short-term debt	317.6us-gaap_ShortTermBorrowings	326.0us-gaap_ShortTermBorrowings
Current portion of long-term debt	125.0us-gaap_LongTermDebtCurrent	100.0us-gaap_LongTermDebtCurrent
Accounts payable	490.7us-gaap_AccountsPayableCurrent	401.9us-gaap_AccountsPayableCurrent
Accrued taxes	87.7us-gaap_TaxesPayableCurrent	78.9us-gaap_TaxesPayableCurrent
Regulatory liabilities	153.7us-gaap_RegulatoryLiabilityCurrent	101.1us-gaap_RegulatoryLiabilityCurrent
Liabilities held for sale	0	49.1
Liabilities of discontinued operations related to IES's retail energy business	0teg_LiabilitiesOfDiscontinuedOperations	447.5teg_LiabilitiesOfDiscontinuedOperations
Other current liabilities	261.4us-gaap_OtherLiabilitiesCurrent	218.9us-gaap_OtherLiabilitiesCurrent
Current liabilities	1,436.1us-gaap_LiabilitiesCurrent	1,723.4us-gaap_LiabilitiesCurrent
Long-term debt	2,956.3us-gaap_LongTermDebtNoncurrent	2,956.2us-gaap_LongTermDebtNoncurrent
Deferred income taxes	1,570.0	1,390.3
Deferred investment tax credits	65.5	57.6
Regulatory liabilities	399.9us-gaap_RegulatoryLiabilityNoncurrent	383.7us-gaap_RegulatoryLiabilityNoncurrent
Environmental remediation liabilities	579.9	600.0
Pension and other postretirement benefit obligations	274.6	200.8
Asset retirement obligations	480.2	491.0
Other long-term liabilities	168.7us-gaap_OtherLiabilitiesNoncurrent	127.1us-gaap_OtherLiabilitiesNoncurrent
Long-term liabilities	6,495.1us-gaap_LiabilitiesNoncurrent	6,206.7us-gaap_LiabilitiesNoncurrent
Commitments and contingencies
Common stock – $1 par value; 200,000,000 shares authorized; 79,963,091 shares issued; 79,534,171 shares outstanding	80.0us-gaap_CommonStockValue	79.9us-gaap_CommonStockValue
Additional paid-in capital	2,642.2	2,660.5
Retained earnings	626.0	567.1
Accumulated other comprehensive loss	(27.6)	(23.2)
Shares in deferred compensation trust	(20.9)us-gaap_CommonStockHeldInTrust	(23.0)us-gaap_CommonStockHeldInTrust
Total common shareholders' equity	3,299.7teg_TotalCommonShareholdersEquity	3,261.3teg_TotalCommonShareholdersEquity
Preferred stock of subsidiary – $100 par value; 1,000,000 shares authorized; 511,882 shares issued; 510,495 shares outstanding	51.1us-gaap_PreferredStockValue	51.1us-gaap_PreferredStockValue
Noncontrolling interest in subsidiaries	0us-gaap_MinorityInterest	1.0us-gaap_MinorityInterest
Total liabilities and equity	$ 11,282.0	$ 11,243.5

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