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Assets And Liabilities Held For Sale (Components Of Assets And Liabilities Held For Sale In Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Current assets | $ 2.3 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent | $ 1.1 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Property, plant and equipment, net | 11.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment | 11.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment
Other assets | 6.4 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets | 7.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets
Total assets held for sale | 19.7 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | 19.1 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Current liabilities | 0.2 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent | 1.0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Other liabilities | 6.8 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent | 7.1 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
Total liabilities held for sale | 7.0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation | 8.1 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Net assets held for sale | $ 12.7 lnt_DisposalGroupNetAssetsHeldForSale | $ 11.0 lnt_DisposalGroupNetAssetsHeldForSale

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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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- Definition Amount classified as other assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount classified as liabilities attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 + Details
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