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v2.4.1.9

Consolidated Statements of Common Equity (USD $) In Millions, unless otherwise specified | Total | IPL [Member] | WPL [Member] | Common Stock [Member] | Common Stock [Member] IPL [Member] | Common Stock [Member] WPL [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] IPL [Member] | Additional Paid-in Capital [Member] WPL [Member] | Retained Earnings [Member] | Retained Earnings [Member] IPL [Member] | Retained Earnings [Member] WPL [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Deferred Compensation, Share-based Payments [Member] | Noncontrolling Interest [Member] WPL [Member]
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Beginning balance at Dec. 31, 2011 |  |  | $ 1,442.4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2011 | 3,013.0 us-gaap_StockholdersEquity | 1,394.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember |  | 1.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 33.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 66.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,510.8 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 927.7 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 869.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,510.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 433.3 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 507.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (0.8)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (8.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | 0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 319.8 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 137.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember | 162.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  | 319.8 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 137.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 162.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Net income | 335.7 us-gaap_NetIncomeLoss | 150.2 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_IplMember | 165.7 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | (199.3)us-gaap_DividendsCommonStock | (122.9)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_IplMember | (112.0)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  | (199.3)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (122.9)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (112.0)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Capital contributions from parent |  | 110.0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_IplMember | 90.0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  | 110.0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 90.0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Other | 1.4 us-gaap_StockholdersEquityOther | 0.1 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = lnt_IplMember | 0.2 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = lnt_WplMember |  |  |  | 0.4 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0.1 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0.2 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 1.0 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Other comprehensive income, net of tax | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = lnt_IplMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2012 |  |  | 1,583.0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2012 | 3,134.9 us-gaap_StockholdersEquity | 1,519.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember |  | 1.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 33.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 66.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,511.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,037.8 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 959.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,630.7 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 448.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 557.6 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (7.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | 0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 69.9 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 22.9 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember | 42.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 31.5 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_IplMember | 43.6 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2012 |  |  | 1,583.0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2012 | 3,134.9 us-gaap_StockholdersEquity | 1,519.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember |  | 1.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 33.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 66.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,511.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,037.8 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 959.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,630.7 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 448.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 557.6 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (0.8)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (7.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | 0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 358.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 173.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember | 175.9 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  | 358.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 173.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 175.9 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Net income | 376.2 us-gaap_NetIncomeLoss | 189.9 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_IplMember | 177.5 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | (208.3)us-gaap_DividendsCommonStock | (128.1)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_IplMember | (116.3)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  | (208.3)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (128.1)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (116.3)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Capital contributions from parent |  | 120.0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_IplMember | 0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  | 120.0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Preferred stock issuance costs | (5.4)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts | (5.4)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = lnt_IplMember |  |  |  |  | (5.4)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (5.4)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Other | 1.3 us-gaap_StockholdersEquityOther | 0.4 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = lnt_IplMember | (0.2)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = lnt_WplMember |  |  |  | 2.0 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0.4 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (0.2)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | (0.7)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Other comprehensive income, net of tax | 0.6 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = lnt_IplMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  | 0.6 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Ending balance at Dec. 31, 2013 | 3,483.2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,879.7 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_IplMember | 1,642.4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2013 | 3,281.4 us-gaap_StockholdersEquity | 1,679.7 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember | 1,642.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember | 1.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 33.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 66.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,507.8 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,152.8 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 959.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,780.7 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 493.5 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 617.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (0.2)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (8.0)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Beginning balance at Sep. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 65.5 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 18.5 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember | 38.2 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 21.1 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_IplMember | 38.2 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2013 | 3,483.2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,879.7 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_IplMember | 1,642.4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2013 | 3,281.4 us-gaap_StockholdersEquity | 1,679.7 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember | 1,642.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember | 1.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 33.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 66.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 108.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 43.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember | 54.8 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 46.0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_IplMember | 54.8 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2013 | 3,483.2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,879.7 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_IplMember | 1,642.4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2013 | 3,281.4 us-gaap_StockholdersEquity | 1,679.7 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember | 1,642.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember | 1.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 33.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 66.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,507.8 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,152.8 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 1,780.7 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 493.5 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 617.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (0.2)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (8.0)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | 0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 383.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 184.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember | 180.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  | 383.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 184.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 180.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0.7 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net income | 393.3 us-gaap_NetIncomeLoss | 194.6 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_IplMember | 180.8 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | (225.8)us-gaap_DividendsCommonStock | (140.0)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_IplMember | (118.7)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  | (225.8)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (140.0)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (118.7)us-gaap_DividendsCommonStock / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Capital contributions from parent |  | 90.0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_IplMember | 0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  | 90.0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Other | 0.4 us-gaap_StockholdersEquityOther |  |  |  |  |  | 1.3 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  | (0.9)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Other comprehensive income, net of tax | (0.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = lnt_IplMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Contributions from noncontrolling interest |  |  | 8.6 us-gaap_ProceedsFromMinorityShareholders / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  | 8.6 us-gaap_ProceedsFromMinorityShareholders / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Distributions to noncontrolling interest |  |  | (0.8)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  | (0.8)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending balance at Dec. 31, 2014 | 3,640.5 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,014.1 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_IplMember | 1,712.3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2014 | 3,438.7 us-gaap_StockholdersEquity | 1,814.1 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember | 1,703.8 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember | 1.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 33.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 66.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,509.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,242.8 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 959.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,938.0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 537.9 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 678.6 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (0.6)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (8.9)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | 8.5 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Beginning balance at Sep. 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 60.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 20.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_IplMember | 29.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 22.6 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_IplMember | 29.8 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2014 | 3,640.5 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,014.1 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_IplMember | 1,712.3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = lnt_WplMember |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2014 | $ 3,438.7 us-gaap_StockholdersEquity | $ 1,814.1 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember | $ 1,703.8 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember | $ 1.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 33.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_IplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 66.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | $ 959.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = lnt_WplMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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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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