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v2.4.1.9

Condensed Parent Company Financial Statements (Condensed Statements of Cash Flow) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net cash flows from operating activities | $ 891.6 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ 731.0 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ 841.1 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows used for investing activities: |  |  |
Other | (14.9)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | (18.8)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 2.6 us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash flows used for investing activities | (917.7)us-gaap_NetCashProvidedByUsedInInvestingActivities | (754.7)us-gaap_NetCashProvidedByUsedInInvestingActivities | (1,155.5)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows used for financing activities: |  |  |
Common stock dividends | (225.8)us-gaap_PaymentsOfDividendsCommonStock | (208.3)us-gaap_PaymentsOfDividendsCommonStock | (199.3)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from issuance of long-term debt | 812.9 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 250.0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 385.0 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Payments to retire long-term debt | (358.5)us-gaap_RepaymentsOfLongTermDebt | (1.5)us-gaap_RepaymentsOfLongTermDebt | (1.4)us-gaap_RepaymentsOfLongTermDebt
Net change in commercial paper | (138.1)us-gaap_ProceedsFromRepaymentsOfShortTermDebt | 11.9 us-gaap_ProceedsFromRepaymentsOfShortTermDebt | 164.7 us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Other | (7.1)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (17.4)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (8.9)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash flows from (used for) financing activities | 73.2 us-gaap_NetCashProvidedByUsedInFinancingActivities | 12.3 us-gaap_NetCashProvidedByUsedInFinancingActivities | 324.2 us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents | 47.1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (11.4)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 9.8 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 9.8 us-gaap_CashAndCashEquivalentsAtCarryingValue | 21.2 us-gaap_CashAndCashEquivalentsAtCarryingValue | 11.4 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 56.9 us-gaap_CashAndCashEquivalentsAtCarryingValue | 9.8 us-gaap_CashAndCashEquivalentsAtCarryingValue | 21.2 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flows information: |  |  |
Interest, net of capitalized interest | (180.8)us-gaap_InterestPaidNet | (171.7)us-gaap_InterestPaidNet | (155.2)us-gaap_InterestPaidNet
Income taxes, net | 5.3 us-gaap_IncomeTaxesPaidNet | 9.6 us-gaap_IncomeTaxesPaidNet | 20.3 us-gaap_IncomeTaxesPaidNet
Parent Company [Member] |  |  |
Net cash flows from operating activities | 246.0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 238.0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 260.0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows used for investing activities: |  |  |
Capital contributions to consolidated subsidiaries | (90.0)us-gaap_PaymentsOfDistributionsToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (120.0)us-gaap_PaymentsOfDistributionsToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (230.0)us-gaap_PaymentsOfDistributionsToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Captial repayments from consolidated subsidiaries | 50 lnt_RepaymentOfCapitalToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 95 lnt_RepaymentOfCapitalToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 lnt_RepaymentOfCapitalToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in notes receivable from affiliates | (23)us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5 us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 134 us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2.0)us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash flows used for investing activities | (63.0)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (22.0)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (95.0)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows used for financing activities: |  |  |
Common stock dividends | (226.0)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (208.0)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (199.0)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from issuance of long-term debt | 250.0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Payments to retire long-term debt | (250.0)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in commercial paper | 45.0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (9.0)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 35.0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other | (2.0)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1.0)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash flows from (used for) financing activities | (183.0)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (216.0)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (165.0)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Supplemental cash flows information: |  |  |
Interest, net of capitalized interest | (11.0)us-gaap_InterestPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (13.0)us-gaap_InterestPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11.0)us-gaap_InterestPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income taxes, net | $ (5.0)us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ (7.0)us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 29.0 us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition The increase (decrease) during the reporting period in the amount owed to the reporting entity in the form of loans and obligations (generally evidenced by promissory notes) made to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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