3.3.1.900 html 623 677 1 false 229 0 false 22 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.algonquinpower.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://www.algonquinpower.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 1002000 - Statement - Consolidated Statements of Operations Sheet http://www.algonquinpower.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 3 false false R4.htm 1003000 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.algonquinpower.com/role/ConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 4 false false R5.htm 1003501 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.algonquinpower.com/role/ConsolidatedStatementsOfComprehensiveIncomeParenthetical Consolidated Statements of Comprehensive Income (Parenthetical) Statements 5 false false R6.htm 1004000 - Statement - Consolidated Statement of Equity Sheet http://www.algonquinpower.com/role/ConsolidatedStatementOfEquity Consolidated Statement of Equity Statements 6 false false R7.htm 1005000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.algonquinpower.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 7 false false R8.htm 2101100 - Disclosure - Notes to the Consolidated Financial Statements Notes to the Consolidated Financial Statements Notes http://www.algonquinpower.com/role/NotesToConsolidatedFinancialStatementsNotesToConsolidatedFinancialStatements Notes to the Consolidated Financial Statements Notes to the Consolidated Financial Statements Notes 8 false false R9.htm 2103100 - Disclosure - Significant accounting policies Sheet http://www.algonquinpower.com/role/SignificantAccountingPolicies Significant accounting policies Notes 9 false false R10.htm 2104100 - Disclosure - Recently issued accounting pronouncements Sheet http://www.algonquinpower.com/role/RecentlyIssuedAccountingPronouncements Recently issued accounting pronouncements Notes 10 false false R11.htm 2105100 - Disclosure - Business acquisitions and development projects Sheet http://www.algonquinpower.com/role/BusinessAcquisitionsAndDevelopmentProjects Business acquisitions and development projects Notes 11 false false R12.htm 2106100 - Disclosure - Accounts receivable Sheet http://www.algonquinpower.com/role/AccountsReceivable Accounts receivable Notes 12 false false R13.htm 2107100 - Disclosure - Property, plant and equipment Sheet http://www.algonquinpower.com/role/PropertyPlantAndEquipment Property, plant and equipment Notes 13 false false R14.htm 2108100 - Disclosure - Intangible assets and goodwill Sheet http://www.algonquinpower.com/role/IntangibleAssetsAndGoodwill Intangible assets and goodwill Notes 14 false false R15.htm 2109100 - Disclosure - Regulatory matters Sheet http://www.algonquinpower.com/role/RegulatoryMatters Regulatory matters Notes 15 false false R16.htm 2110100 - Disclosure - Long-term investments Sheet http://www.algonquinpower.com/role/LongTermInvestments Long-term investments Notes 16 false false R17.htm 2111100 - Disclosure - Long-term debt Sheet http://www.algonquinpower.com/role/LongTermDebt Long-term debt Notes 17 false false R18.htm 2112100 - Disclosure - Pension and other post-retirement benefits Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefits Pension and other post-retirement benefits Notes 18 false false R19.htm 2113100 - Disclosure - Mandatorily redeemable Series C preferred shares Sheet http://www.algonquinpower.com/role/MandatorilyRedeemableSeriesCPreferredShares Mandatorily redeemable Series C preferred shares Notes 19 false false R20.htm 2114100 - Disclosure - Other assets Sheet http://www.algonquinpower.com/role/OtherAssets Other assets Notes 20 false false R21.htm 2115100 - Disclosure - Other long-term liabilities and deferred credits Sheet http://www.algonquinpower.com/role/OtherLongTermLiabilitiesAndDeferredCredits Other long-term liabilities and deferred credits Notes 21 false false R22.htm 2116100 - Disclosure - Shareholders' capital Sheet http://www.algonquinpower.com/role/ShareholdersCapital Shareholders' capital Notes 22 false false R23.htm 2117100 - Disclosure - Accumulated other comprehensive income (loss) Sheet http://www.algonquinpower.com/role/AccumulatedOtherComprehensiveIncomeLoss Accumulated other comprehensive income (loss) Notes 23 false false R24.htm 2118100 - Disclosure - Dividends Sheet http://www.algonquinpower.com/role/Dividends Dividends Notes 24 false false R25.htm 2120100 - Disclosure - Related party transactions Sheet http://www.algonquinpower.com/role/RelatedPartyTransactions Related party transactions Notes 25 false false R26.htm 2121100 - Disclosure - Non-controlling Interests Sheet http://www.algonquinpower.com/role/NonControllingInterests Non-controlling Interests Notes 26 false false R27.htm 2122100 - Disclosure - Income taxes Sheet http://www.algonquinpower.com/role/IncomeTaxes Income taxes Notes 27 false false R28.htm 2123100 - Disclosure - Basic and diluted net earnings per share Sheet http://www.algonquinpower.com/role/BasicAndDilutedNetEarningsPerShare Basic and diluted net earnings per share Notes 28 false false R29.htm 2124100 - Disclosure - Segmented information Sheet http://www.algonquinpower.com/role/SegmentedInformation Segmented information Notes 29 false false R30.htm 2125100 - Disclosure - Commitments and contingencies Sheet http://www.algonquinpower.com/role/CommitmentsAndContingencies Commitments and contingencies Notes 30 false false R31.htm 2126100 - Disclosure - Non-cash operating items Sheet http://www.algonquinpower.com/role/NonCashOperatingItems Non-cash operating items Notes 31 false false R32.htm 2127100 - Disclosure - Financial instruments Sheet http://www.algonquinpower.com/role/FinancialInstruments Financial instruments Notes 32 false false R33.htm 2128100 - Disclosure - Subsequent event - Convertible Unsecured Subordinated Debentures Sheet http://www.algonquinpower.com/role/SubsequentEventConvertibleUnsecuredSubordinatedDebentures Subsequent event - Convertible Unsecured Subordinated Debentures Notes 33 false false R34.htm 2129100 - Disclosure - Comparative figures Sheet http://www.algonquinpower.com/role/ComparativeFigures Comparative figures Notes 34 false false R35.htm 2203201 - Disclosure - Significant accounting policies (Policies) Sheet http://www.algonquinpower.com/role/SignificantAccountingPoliciesPolicies Significant accounting policies (Policies) Policies 35 false false R36.htm 2303302 - Disclosure - Significant accounting policies (Tables) Sheet http://www.algonquinpower.com/role/SignificantAccountingPoliciesTables Significant accounting policies (Tables) Tables http://www.algonquinpower.com/role/SignificantAccountingPolicies 36 false false R37.htm 2305301 - Disclosure - Business acquisitions and development projects (Tables) Sheet http://www.algonquinpower.com/role/BusinessAcquisitionsAndDevelopmentProjectsTables Business acquisitions and development projects (Tables) Tables http://www.algonquinpower.com/role/BusinessAcquisitionsAndDevelopmentProjects 37 false false R38.htm 2307301 - Disclosure - Property, plant and equipment (Tables) Sheet http://www.algonquinpower.com/role/PropertyPlantAndEquipmentTables Property, plant and equipment (Tables) Tables http://www.algonquinpower.com/role/PropertyPlantAndEquipment 38 false false R39.htm 2308301 - Disclosure - Intangible assets and goodwill (Tables) Sheet http://www.algonquinpower.com/role/IntangibleAssetsAndGoodwillTables Intangible assets and goodwill (Tables) Tables http://www.algonquinpower.com/role/IntangibleAssetsAndGoodwill 39 false false R40.htm 2309301 - Disclosure - Regulatory matters (Tables) Sheet http://www.algonquinpower.com/role/RegulatoryMattersTables Regulatory matters (Tables) Tables http://www.algonquinpower.com/role/RegulatoryMatters 40 false false R41.htm 2310301 - Disclosure - Long-term investments (Tables) Sheet http://www.algonquinpower.com/role/LongTermInvestmentsTables Long-term investments (Tables) Tables http://www.algonquinpower.com/role/LongTermInvestments 41 false false R42.htm 2311301 - Disclosure - Long-term debt (Tables) Sheet http://www.algonquinpower.com/role/LongTermDebtTables Long-term debt (Tables) Tables http://www.algonquinpower.com/role/LongTermDebt 42 false false R43.htm 2312301 - Disclosure - Pension and other post-retirement benefits (Tables) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsTables Pension and other post-retirement benefits (Tables) Tables http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefits 43 false false R44.htm 2313301 - Disclosure - Mandatorily redeemable Series C preferred shares (Tables) Sheet http://www.algonquinpower.com/role/MandatorilyRedeemableSeriesCPreferredSharesTables Mandatorily redeemable Series C preferred shares (Tables) Tables http://www.algonquinpower.com/role/MandatorilyRedeemableSeriesCPreferredShares 44 false false R45.htm 2314301 - Disclosure - Other assets (Tables) Sheet http://www.algonquinpower.com/role/OtherAssetsTables Other assets (Tables) Tables http://www.algonquinpower.com/role/OtherAssets 45 false false R46.htm 2315301 - Disclosure - Other long-term liabilities and deferred credits (Tables) Sheet http://www.algonquinpower.com/role/OtherLongTermLiabilitiesAndDeferredCreditsTables Other long-term liabilities and deferred credits (Tables) Tables http://www.algonquinpower.com/role/OtherLongTermLiabilitiesAndDeferredCredits 46 false false R47.htm 2316301 - Disclosure - Shareholders' capital (Tables) Sheet http://www.algonquinpower.com/role/ShareholdersCapitalTables Shareholders' capital (Tables) Tables http://www.algonquinpower.com/role/ShareholdersCapital 47 false false R48.htm 2317301 - Disclosure - Accumulated other comprehensive income (loss) (Tables) Sheet http://www.algonquinpower.com/role/AccumulatedOtherComprehensiveIncomeLossTables Accumulated other comprehensive income (loss) (Tables) Tables http://www.algonquinpower.com/role/AccumulatedOtherComprehensiveIncomeLoss 48 false false R49.htm 2318300 - Disclosure - Dividends (Tables) Sheet http://www.algonquinpower.com/role/DividendsTables Dividends (Tables) Tables http://www.algonquinpower.com/role/Dividends 49 false false R50.htm 2321301 - Disclosure - Non-controlling Interests (Tables) Sheet http://www.algonquinpower.com/role/NonControllingInterestsTables Non-controlling Interests (Tables) Tables http://www.algonquinpower.com/role/NonControllingInterests 50 false false R51.htm 2322301 - Disclosure - Income taxes (Tables) Sheet http://www.algonquinpower.com/role/IncomeTaxesTables Income taxes (Tables) Tables http://www.algonquinpower.com/role/IncomeTaxes 51 false false R52.htm 2323301 - Disclosure - Basic and diluted net earnings per share (Tables) Sheet http://www.algonquinpower.com/role/BasicAndDilutedNetEarningsPerShareTables Basic and diluted net earnings per share (Tables) Tables http://www.algonquinpower.com/role/BasicAndDilutedNetEarningsPerShare 52 false false R53.htm 2324301 - Disclosure - Segmented information (Tables) Sheet http://www.algonquinpower.com/role/SegmentedInformationTables Segmented information (Tables) Tables http://www.algonquinpower.com/role/SegmentedInformation 53 false false R54.htm 2325301 - Disclosure - Commitments and contingencies (Tables) Sheet http://www.algonquinpower.com/role/CommitmentsAndContingenciesTables Commitments and contingencies (Tables) Tables http://www.algonquinpower.com/role/CommitmentsAndContingencies 54 false false R55.htm 2326301 - Disclosure - Non-cash operating items (Tables) Sheet http://www.algonquinpower.com/role/NonCashOperatingItemsTables Non-cash operating items (Tables) Tables http://www.algonquinpower.com/role/NonCashOperatingItems 55 false false R56.htm 2327301 - Disclosure - Financial instruments (Tables) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsTables Financial instruments (Tables) Tables http://www.algonquinpower.com/role/FinancialInstruments 56 false false R57.htm 2403403 - Disclosure - Significant accounting policies - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/SignificantAccountingPoliciesAdditionalInformationDetail Significant accounting policies - Additional Information (Detail) Details 57 false false R58.htm 2403404 - Disclosure - Significant accounting policies - Capitalization of Interest (Detail) Sheet http://www.algonquinpower.com/role/SignificantAccountingPoliciesCapitalizationOfInterestDetail Significant accounting policies - Capitalization of Interest (Detail) Details 58 false false R59.htm 2403405 - Disclosure - Significant accounting policies - Estimated And Weighted Average Useful Lives of Depreciable Assets (Detail) Sheet http://www.algonquinpower.com/role/SignificantAccountingPoliciesEstimatedAndWeightedAverageUsefulLivesOfDepreciableAssetsDetail Significant accounting policies - Estimated And Weighted Average Useful Lives of Depreciable Assets (Detail) Details 59 false false R60.htm 2404401 - Disclosure - Recently issued accounting pronouncements Recently issued accounting pronouncements (Details) Sheet http://www.algonquinpower.com/role/RecentlyIssuedAccountingPronouncementsRecentlyIssuedAccountingPronouncementsDetails Recently issued accounting pronouncements Recently issued accounting pronouncements (Details) Details 60 false false R61.htm 2405402 - Disclosure - Business acquisitions and development projects - Additional Information (Details) Sheet http://www.algonquinpower.com/role/BusinessAcquisitionsAndDevelopmentProjectsAdditionalInformationDetails Business acquisitions and development projects - Additional Information (Details) Details 61 false false R62.htm 2405403 - Disclosure - Business acquisitions and development projects - Acquisition of Noncontrolling Interest (Details) Sheet http://www.algonquinpower.com/role/BusinessAcquisitionsAndDevelopmentProjectsAcquisitionOfNoncontrollingInterestDetails Business acquisitions and development projects - Acquisition of Noncontrolling Interest (Details) Details 62 false false R63.htm 2406401 - Disclosure - Accounts receivable - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/AccountsReceivableAdditionalInformationDetail Accounts receivable - Additional Information (Detail) Details 63 false false R64.htm 2407402 - Disclosure - Property, plant and equipment (Detail) Sheet http://www.algonquinpower.com/role/PropertyPlantAndEquipmentDetail Property, plant and equipment (Detail) Details http://www.algonquinpower.com/role/PropertyPlantAndEquipmentTables 64 false false R65.htm 2407403 - Disclosure - Property, plant and equipment - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/PropertyPlantAndEquipmentAdditionalInformationDetail Property, plant and equipment - Additional Information (Detail) Details 65 false false R66.htm 2408402 - Disclosure - Intangible assets and goodwill - Schedule of Intangible Assets (Detail) Sheet http://www.algonquinpower.com/role/IntangibleAssetsAndGoodwillScheduleOfIntangibleAssetsDetail Intangible assets and goodwill - Schedule of Intangible Assets (Detail) Details 66 false false R67.htm 2408403 - Disclosure - Intangible assets and goodwill - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/IntangibleAssetsAndGoodwillAdditionalInformationDetail Intangible assets and goodwill - Additional Information (Detail) Details 67 false false R68.htm 2408404 - Disclosure - Intangible assets and goodwill - Schedule of Goodwill (Details) Sheet http://www.algonquinpower.com/role/IntangibleAssetsAndGoodwillScheduleOfGoodwillDetails Intangible assets and goodwill - Schedule of Goodwill (Details) Details 68 false false R69.htm 2409402 - Disclosure - Regulatory matters - Regulatory Assets and Liabilities (Additional Information) (Detail) Sheet http://www.algonquinpower.com/role/RegulatoryMattersRegulatoryAssetsAndLiabilitiesAdditionalInformationDetail Regulatory matters - Regulatory Assets and Liabilities (Additional Information) (Detail) Details 69 false false R70.htm 2409403 - Disclosure - Regulatory matters - Regulatory Assets and Liabilities (Detail) Sheet http://www.algonquinpower.com/role/RegulatoryMattersRegulatoryAssetsAndLiabilitiesDetail Regulatory matters - Regulatory Assets and Liabilities (Detail) Details 70 false false R71.htm 2410402 - Disclosure - Long-term investments (Detail) Sheet http://www.algonquinpower.com/role/LongTermInvestmentsDetail Long-term investments (Detail) Details http://www.algonquinpower.com/role/LongTermInvestmentsTables 71 false false R72.htm 2410403 - Disclosure - Long-term investments (Additional Information) (Detail) Sheet http://www.algonquinpower.com/role/LongTermInvestmentsAdditionalInformationDetail Long-term investments (Additional Information) (Detail) Details http://www.algonquinpower.com/role/LongTermInvestmentsTables 72 false false R73.htm 2411402 - Disclosure - Long-term debt (Detail) Sheet http://www.algonquinpower.com/role/LongTermDebtDetail Long-term debt (Detail) Details http://www.algonquinpower.com/role/LongTermDebtTables 73 false false R74.htm 2411403 - Disclosure - Long-term debt - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/LongTermDebtAdditionalInformationDetail Long-term debt - Additional Information (Detail) Details 74 false false R75.htm 2411404 - Disclosure - Long-term debt Long-term debt - Narrative (Detail) Sheet http://www.algonquinpower.com/role/LongTermDebtLongTermDebtNarrativeDetail Long-term debt Long-term debt - Narrative (Detail) Details 75 false false R76.htm 2411405 - Disclosure - Long-term debt Long-term debt - Principal Payments (Detail) Sheet http://www.algonquinpower.com/role/LongTermDebtLongTermDebtPrincipalPaymentsDetail Long-term debt Long-term debt - Principal Payments (Detail) Details 76 false false R77.htm 2412402 - Disclosure - Pension and other post-retirement benefits - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsAdditionalInformationDetail Pension and other post-retirement benefits - Additional Information (Detail) Details 77 false false R78.htm 2412403 - Disclosure - Pension and other post-retirement benefits - Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusDetail Pension and other post-retirement benefits - Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) Details 78 false false R79.htm 2412404 - Disclosure - Pension and other post-retirement benefits - Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsAmountsRecognizedInAccumulatedOtherComprehensiveLossDetail Pension and other post-retirement benefits - Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) Details 79 false false R80.htm 2412405 - Disclosure - Pension and other post-retirement benefits - Weighted Average Assumptions Used to Determine Net Benefit Cost (Detail) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsWeightedAverageAssumptionsUsedToDetermineNetBenefitCostDetail Pension and other post-retirement benefits - Weighted Average Assumptions Used to Determine Net Benefit Cost (Detail) Details 80 false false R81.htm 2412406 - Disclosure - Pension and other post-retirement benefits - Weighted Average Assumptions Used to Determine Net Benefit Obligation (Detail) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsWeightedAverageAssumptionsUsedToDetermineNetBenefitObligationDetail Pension and other post-retirement benefits - Weighted Average Assumptions Used to Determine Net Benefit Obligation (Detail) Details 81 false false R82.htm 2412407 - Disclosure - Pension and other post-retirement benefits - Effect of One Percent Change in Assumed Health Care Cost Trend Rate (HCCTR) (Detail) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsEffectOfOnePercentChangeInAssumedHealthCareCostTrendRateHcctrDetail Pension and other post-retirement benefits - Effect of One Percent Change in Assumed Health Care Cost Trend Rate (HCCTR) (Detail) Details 82 false false R83.htm 2412408 - Disclosure - Pension and other post-retirement benefits - Components of Net Benefit Costs for Pension Plans and OPEB Recorded as Part of Administrative Expenses (Detail) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsComponentsOfNetBenefitCostsForPensionPlansAndOpebRecordedAsPartOfAdministrativeExpensesDetail Pension and other post-retirement benefits - Components of Net Benefit Costs for Pension Plans and OPEB Recorded as Part of Administrative Expenses (Detail) Details 83 false false R84.htm 2412409 - Disclosure - Pension and other post-retirement benefits - Target Plan Asset Allocation (Details) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsTargetPlanAssetAllocationDetails Pension and other post-retirement benefits - Target Plan Asset Allocation (Details) Details 84 false false R85.htm 2412410 - Disclosure - Pension and other post-retirement benefits - Fair Value of Investments by Asset Category (Details) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsFairValueOfInvestmentsByAssetCategoryDetails Pension and other post-retirement benefits - Fair Value of Investments by Asset Category (Details) Details 85 false false R86.htm 2412411 - Disclosure - Pension and other post-retirement benefits - Expected Benefit Payments (Detail) Sheet http://www.algonquinpower.com/role/PensionAndOtherPostRetirementBenefitsExpectedBenefitPaymentsDetail Pension and other post-retirement benefits - Expected Benefit Payments (Detail) Details 86 false false R87.htm 2413402 - Disclosure - Mandatorily redeemable Series C preferred shares (Details) Sheet http://www.algonquinpower.com/role/MandatorilyRedeemableSeriesCPreferredSharesDetails Mandatorily redeemable Series C preferred shares (Details) Details http://www.algonquinpower.com/role/MandatorilyRedeemableSeriesCPreferredSharesTables 87 false false R88.htm 2414402 - Disclosure - Other assets (Detail) Sheet http://www.algonquinpower.com/role/OtherAssetsDetail Other assets (Detail) Details http://www.algonquinpower.com/role/OtherAssetsTables 88 false false R89.htm 2415402 - Disclosure - Other long-term liabilities and deferred credits (Detail) Sheet http://www.algonquinpower.com/role/OtherLongTermLiabilitiesAndDeferredCreditsDetail Other long-term liabilities and deferred credits (Detail) Details http://www.algonquinpower.com/role/OtherLongTermLiabilitiesAndDeferredCreditsTables 89 false false R90.htm 2415403 - Disclosure - Other long-term liabilities and deferred credits - Changes in Environmental Remediation Obligation (Details) Sheet http://www.algonquinpower.com/role/OtherLongTermLiabilitiesAndDeferredCreditsChangesInEnvironmentalRemediationObligationDetails Other long-term liabilities and deferred credits - Changes in Environmental Remediation Obligation (Details) Details 90 false false R91.htm 2416402 - Disclosure - Shareholders' capital - Common Shares (Detail) Sheet http://www.algonquinpower.com/role/ShareholdersCapitalCommonSharesDetail Shareholders' capital - Common Shares (Detail) Details 91 false false R92.htm 2416403 - Disclosure - Shareholders' capital - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/ShareholdersCapitalAdditionalInformationDetail Shareholders' capital - Additional Information (Detail) Details 92 false false R93.htm 2416404 - Disclosure - Shareholder's capital - Share-Based Compensation Expense (Detail) Sheet http://www.algonquinpower.com/role/ShareholdersCapitalShareBasedCompensationExpenseDetail Shareholder's capital - Share-Based Compensation Expense (Detail) Details 93 false false R94.htm 2416405 - Disclosure - Shareholders' capital - Fair Value of Share Options Granted (Detail) Sheet http://www.algonquinpower.com/role/ShareholdersCapitalFairValueOfShareOptionsGrantedDetail Shareholders' capital - Fair Value of Share Options Granted (Detail) Details 94 false false R95.htm 2416406 - Disclosure - Shareholders' capital - Stock Option Activity (Detail) Sheet http://www.algonquinpower.com/role/ShareholdersCapitalStockOptionActivityDetail Shareholders' capital - Stock Option Activity (Detail) Details 95 false false R96.htm 2416407 - Disclosure - Shareholder's capital - Performance Stock Units (Detail) Sheet http://www.algonquinpower.com/role/ShareholdersCapitalPerformanceStockUnitsDetail Shareholder's capital - Performance Stock Units (Detail) Details 96 false false R97.htm 2417402 - Disclosure - Accumulated other comprehensive income (loss) (Detail) Sheet http://www.algonquinpower.com/role/AccumulatedOtherComprehensiveIncomeLossDetail Accumulated other comprehensive income (loss) (Detail) Details http://www.algonquinpower.com/role/AccumulatedOtherComprehensiveIncomeLossTables 97 false false R98.htm 2418401 - Disclosure - Dividends (Detail) Sheet http://www.algonquinpower.com/role/DividendsDetail Dividends (Detail) Details http://www.algonquinpower.com/role/DividendsTables 98 false false R99.htm 2420401 - Disclosure - Related party transactions (Detail) Sheet http://www.algonquinpower.com/role/RelatedPartyTransactionsDetail Related party transactions (Detail) Details http://www.algonquinpower.com/role/RelatedPartyTransactions 99 false false R100.htm 2421402 - Disclosure - Non-controlling Interests (Details) Sheet http://www.algonquinpower.com/role/NonControllingInterestsDetails Non-controlling Interests (Details) Details http://www.algonquinpower.com/role/NonControllingInterestsTables 100 false false R101.htm 2422402 - Disclosure - Income taxes - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/IncomeTaxesAdditionalInformationDetail Income taxes - Additional Information (Detail) Details 101 false false R102.htm 2422403 - Disclosure - Income taxes - Provision for Income Taxes (Detail) Sheet http://www.algonquinpower.com/role/IncomeTaxesProvisionForIncomeTaxesDetail Income taxes - Provision for Income Taxes (Detail) Details 102 false false R103.htm 2422404 - Disclosure - Income taxes - Income (Loss) Before Taxes (Detail) Sheet http://www.algonquinpower.com/role/IncomeTaxesIncomeLossBeforeTaxesDetail Income taxes - Income (Loss) Before Taxes (Detail) Details 103 false false R104.htm 2422405 - Disclosure - Income taxes - Income Tax Expense (Recovery) Attributable to Income (Loss) (Detail) Sheet http://www.algonquinpower.com/role/IncomeTaxesIncomeTaxExpenseRecoveryAttributableToIncomeLossDetail Income taxes - Income Tax Expense (Recovery) Attributable to Income (Loss) (Detail) Details 104 false false R105.htm 2422406 - Disclosure - Income taxes - Tax Effect on Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Detail) Sheet http://www.algonquinpower.com/role/IncomeTaxesTaxEffectOnSignificantPortionsOfDeferredTaxAssetsAndDeferredTaxLiabilitiesDetail Income taxes - Tax Effect on Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Detail) Details 105 false false R106.htm 2422407 - Disclosure - Income taxes - Non Capital Losses Carry Forwards (Detail) Sheet http://www.algonquinpower.com/role/IncomeTaxesNonCapitalLossesCarryForwardsDetail Income taxes - Non Capital Losses Carry Forwards (Detail) Details 106 false false R107.htm 2423402 - Disclosure - Basic and diluted net earnings per share - Schedule of Earnings per Share (Detail) Sheet http://www.algonquinpower.com/role/BasicAndDilutedNetEarningsPerShareScheduleOfEarningsPerShareDetail Basic and diluted net earnings per share - Schedule of Earnings per Share (Detail) Details 107 false false R108.htm 2423403 - Disclosure - Basic and diluted net earnings per share - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/BasicAndDilutedNetEarningsPerShareAdditionalInformationDetail Basic and diluted net earnings per share - Additional Information (Detail) Details 108 false false R109.htm 2424402 - Disclosure - Segmented information - Results of Operations and Assets for Segments (Detail) Sheet http://www.algonquinpower.com/role/SegmentedInformationResultsOfOperationsAndAssetsForSegmentsDetail Segmented information - Results of Operations and Assets for Segments (Detail) Details 109 false false R110.htm 2424403 - Disclosure - Segmented information - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/SegmentedInformationAdditionalInformationDetail Segmented information - Additional Information (Detail) Details 110 false false R111.htm 2424404 - Disclosure - Segmented information - Information on Operations by Geographic Area (Detail) Sheet http://www.algonquinpower.com/role/SegmentedInformationInformationOnOperationsByGeographicAreaDetail Segmented information - Information on Operations by Geographic Area (Detail) Details 111 false false R112.htm 2425402 - Disclosure - Commitments and contingencies - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/CommitmentsAndContingenciesAdditionalInformationDetail Commitments and contingencies - Additional Information (Detail) Details 112 false false R113.htm 2425403 - Disclosure - Commitments and contingencies - Estimates of Future Commitments (Detail) Sheet http://www.algonquinpower.com/role/CommitmentsAndContingenciesEstimatesOfFutureCommitmentsDetail Commitments and contingencies - Estimates of Future Commitments (Detail) Details 113 false false R114.htm 2426402 - Disclosure - Changes in Non-Cash Operating Items (Detail) Sheet http://www.algonquinpower.com/role/ChangesInNonCashOperatingItemsDetail Changes in Non-Cash Operating Items (Detail) Details 114 false false R115.htm 2427402 - Disclosure - Financial instruments - Fair Value of Financial Instruments (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsFairValueOfFinancialInstrumentsDetail Financial instruments - Fair Value of Financial Instruments (Detail) Details 115 false false R116.htm 2427403 - Disclosure - Financial instruments - Additional Information (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsAdditionalInformationDetail Financial instruments - Additional Information (Detail) Details 116 false false R117.htm 2427404 - Disclosure - Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsSummaryOfCommodityVolumesAssociatedWithDerivativeContractsDetail Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail) Details 117 false false R118.htm 2427405 - Disclosure - Financial instruments - Impact of Change in Fair Value of Natural Gas Derivative Contracts (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsImpactOfChangeInFairValueOfNaturalGasDerivativeContractsDetail Financial instruments - Impact of Change in Fair Value of Natural Gas Derivative Contracts (Detail) Details 118 false false R119.htm 2427406 - Disclosure - Financial instruments - Long-term Energy Derivative Contracts (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsLongTermEnergyDerivativeContractsDetail Financial instruments - Long-term Energy Derivative Contracts (Detail) Details 119 false false R120.htm 2427407 - Disclosure - Financial instruments - Derivative Financial Instruments Designated as Cash Flow Hedge, Effect on Statement of Operations (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsDerivativeFinancialInstrumentsDesignatedAsCashFlowHedgeEffectOnStatementOfOperationsDetail Financial instruments - Derivative Financial Instruments Designated as Cash Flow Hedge, Effect on Statement of Operations (Detail) Details 120 false false R121.htm 2427408 - Disclosure - Financial instruments - Effects on Statement of Operations of Derivative Financial Instruments Not Designated as Hedges (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsEffectsOnStatementOfOperationsOfDerivativeFinancialInstrumentsNotDesignatedAsHedgesDetail Financial instruments - Effects on Statement of Operations of Derivative Financial Instruments Not Designated as Hedges (Detail) Details 121 false false R122.htm 2427409 - Disclosure - Financial instruments - Maximum Credit Risk for these Financial Instruments (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsMaximumCreditRiskForTheseFinancialInstrumentsDetail Financial instruments - Maximum Credit Risk for these Financial Instruments (Detail) Details 122 false false R123.htm 2427410 - Disclosure - Financial instruments - Liabilities Mature (Detail) Sheet http://www.algonquinpower.com/role/FinancialInstrumentsLiabilitiesMatureDetail Financial instruments - Liabilities Mature (Detail) Details 123 false false R124.htm 2428401 - Disclosure - Subsequent event - Convertible Unsecured Subordinated Debentures (Details) Sheet http://www.algonquinpower.com/role/SubsequentEventConvertibleUnsecuredSubordinatedDebenturesDetails Subsequent event - Convertible Unsecured Subordinated Debentures (Details) Details http://www.algonquinpower.com/role/SubsequentEventConvertibleUnsecuredSubordinatedDebentures 124 false false All Reports Book All Reports aqunf-20151231.xml aqunf-20151231.xsd aqunf-20151231_cal.xml aqunf-20151231_def.xml aqunf-20151231_lab.xml aqunf-20151231_pre.xml true true