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v2.4.1.9

Condensed Parent Company Financial Statements (Condensed Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Other | $ 116.9 us-gaap_OtherAssetsCurrent | $ 125.7 us-gaap_OtherAssetsCurrent |  |
Total current assets | 1,043.1 us-gaap_AssetsCurrent | 1,011.2 us-gaap_AssetsCurrent |  |
Investments: |  |  |  |
Other | 58.4 lnt_OtherLongTermInvestmentsAndMarketableSecurities | 57.5 lnt_OtherLongTermInvestmentsAndMarketableSecurities |  |
Total investments | 344.9 us-gaap_LongTermInvestments | 329.6 us-gaap_LongTermInvestments |  |
Other assets | 1,759.5 lnt_DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent | 1,445.1 lnt_DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent |  |
Total assets | 12,085.9 us-gaap_Assets | 11,112.4 us-gaap_Assets | 10,785.5 us-gaap_Assets |
Current liabilities: |  |  |  |
Current maturities of long-term debt | 183.0 us-gaap_LongTermDebtCurrent | 358.5 us-gaap_LongTermDebtCurrent |  |
Commercial paper | 141.3 us-gaap_CommercialPaper | 279.4 us-gaap_CommercialPaper |  |
Other | 262.4 us-gaap_OtherLiabilitiesCurrent | 233.8 us-gaap_OtherLiabilitiesCurrent |  |
Total current liabilities | 1,214.7 us-gaap_LiabilitiesCurrent | 1,433.3 us-gaap_LiabilitiesCurrent |  |
Long-term debt, net | 3,606.7 us-gaap_LongTermDebtNoncurrent | 2,977.8 us-gaap_LongTermDebtNoncurrent |  |
Other liabilities: |  |  |  |
Non-current deferred tax liabilities | 2,321.1 us-gaap_DeferredTaxLiabilitiesNoncurrent | 2,112.7 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Other | 260.1 us-gaap_OtherLiabilitiesNoncurrent | 273.9 us-gaap_OtherLiabilitiesNoncurrent |  |
Total other liabilities | 3,624.0 us-gaap_DeferredCreditsAndOtherLiabilities | 3,218.1 us-gaap_DeferredCreditsAndOtherLiabilities |  |
Common Equity: |  |  |  |
Retained earnings | 1,938.0 us-gaap_RetainedEarningsAccumulatedDeficit | 1,780.7 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Shares in deferred compensation trust | (8.9)us-gaap_CommonStockHeldInTrust | (8.0)us-gaap_CommonStockHeldInTrust |  |
Total common equity | 3,438.7 us-gaap_StockholdersEquity | 3,281.4 us-gaap_StockholdersEquity | 3,134.9 us-gaap_StockholdersEquity | 3,013.0 us-gaap_StockholdersEquity
Total liabilities and equity | 12,085.9 us-gaap_LiabilitiesAndStockholdersEquity | 11,112.4 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company [Member] |  |  |  |
Current assets: |  |  |  |
Notes receivable from affiliated companies | 95 us-gaap_NotesReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 72 us-gaap_NotesReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other | 4.0 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3.0 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current assets | 99.0 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 75.0 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investments: |  |  |  |
Investments in consolidated subsidiaries | 3,753 lnt_ParentCompanyInvestmentInConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,585 lnt_ParentCompanyInvestmentInConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other | 15.0 lnt_OtherLongTermInvestmentsAndMarketableSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14.0 lnt_OtherLongTermInvestmentsAndMarketableSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total investments | 3,768.0 us-gaap_LongTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,599.0 us-gaap_LongTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 10.0 lnt_DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6.0 lnt_DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 3,877.0 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,680.0 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current liabilities: |  |  |  |
Current maturities of long-term debt | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 250.0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Commercial paper | 141.0 us-gaap_CommercialPaper / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 96.0 us-gaap_CommercialPaper / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other | 29.0 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10.0 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current liabilities | 170.0 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 356.0 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt, net | 250.0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities: |  |  |  |
Non-current deferred tax liabilities | 11.0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 39.0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other | 11.0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7.0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total other liabilities | 22.0 us-gaap_DeferredCreditsAndOtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 46.0 us-gaap_DeferredCreditsAndOtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common Equity: |  |  |  |
Common stock and additional paid-in capital | 1,510 us-gaap_CommonStocksIncludingAdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,509 us-gaap_CommonStocksIncludingAdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 1,934.0 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,777.0 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Shares in deferred compensation trust | (9.0)us-gaap_CommonStockHeldInTrust / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8.0)us-gaap_CommonStockHeldInTrust / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total common equity | 3,435.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,278.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and equity | $ 3,877.0 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 3,680.0 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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