3.22.4 html 572 654 1 true 201 0 false 11 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Consolidated Balance Sheets Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 100020 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 4 false false R5.htm 100040 - Statement - Consolidated Statements of Shareholders' Equity Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfShareholdersEquity Consolidated Statements of Shareholders' Equity Statements 5 false false R6.htm 100050 - Statement - Consolidated Statements of Cash Flows Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 6 false false R7.htm 100060 - Disclosure - Basis of Presentation and Business Overview Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureBasisOfPresentationAndBusinessOverview Basis of Presentation and Business Overview Notes 7 false false R8.htm 100070 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 8 false false R9.htm 100080 - Disclosure - Net Income per Share Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureNetIncomePerShare1 Net Income per Share Notes 9 false false R10.htm 100090 - Disclosure - Acquisitions, Divestitures and Other Arrangements Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsDivestituresAndOtherArrangements Acquisitions, Divestitures and Other Arrangements Notes 10 false false R11.htm 100100 - Disclosure - Inventories Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureInventories Inventories Notes 11 false false R12.htm 100110 - Disclosure - Prepaid Expenses and Other Current Assets Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosurePrepaidExpensesAndOtherCurrentAssets Prepaid Expenses and Other Current Assets Notes 12 false false R13.htm 100120 - Disclosure - Property, Plant and Equipment Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment Property, Plant and Equipment Notes 13 false false R14.htm 100130 - Disclosure - Goodwill and Intangible Assets Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssets Goodwill and Intangible Assets Notes 14 false false R15.htm 100140 - Disclosure - Accrued Expenses and Other Current Liabilities Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilities Accrued Expenses and Other Current Liabilities Notes 15 false false R16.htm 100150 - Disclosure - Accrued Trade Discounts and Rebates Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedTradeDiscountsAndRebates Accrued Trade Discounts and Rebates Notes 16 false false R17.htm 100160 - Disclosure - Segment and Other Information Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSegmentAndOtherInformation Segment and Other Information Notes 17 false false R18.htm 100170 - Disclosure - Fair Value Measurements Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurements Fair Value Measurements Notes 18 false false R19.htm 100180 - Disclosure - Debt Agreements Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureDebtAgreements Debt Agreements Notes 19 false false R20.htm 100190 - Disclosure - Derivative Instruments and Hedging Activities Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities1 Derivative Instruments and Hedging Activities Notes 20 false false R21.htm 100200 - Disclosure - Lease Obligations Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureLeaseObligations Lease Obligations Notes 21 false false R22.htm 100210 - Disclosure - Commitments and Contingencies Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 22 false false R23.htm 100220 - Disclosure - Legal Proceedings Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureLegalProceedings Legal Proceedings Notes 23 false false R24.htm 100230 - Disclosure - Shareholders' Equity Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareholdersEquity Shareholders' Equity Notes 24 false false R25.htm 100240 - Disclosure - Share-Based and Long-Term Incentive Plans Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlans Share-Based and Long-Term Incentive Plans Notes 25 false false R26.htm 100250 - Disclosure - Income Taxes Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 26 false false R27.htm 100260 - Disclosure - Employee Benefit Plans Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefitPlans Employee Benefit Plans Notes 27 false false R28.htm 100270 - Disclosure - Schedule II - Valuation and Qualifying Accounts Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccounts Schedule II - Valuation and Qualifying Accounts Notes 28 false false R29.htm 100280 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 29 false false R30.htm 100290 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 30 false false R31.htm 100300 - Disclosure - Net Income per Share (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureNetIncomePerShareTables Net Income per Share (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureNetIncomePerShare1 31 false false R32.htm 100310 - Disclosure - Acquisitions, Divestitures and Other Arrangements (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsDivestituresAndOtherArrangementsTables Acquisitions, Divestitures and Other Arrangements (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsDivestituresAndOtherArrangements 32 false false R33.htm 100320 - Disclosure - Inventories (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureInventoriesTables Inventories (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureInventories 33 false false R34.htm 100330 - Disclosure - Prepaid Expenses and Other Current Assets (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosurePrepaidExpensesAndOtherCurrentAssetsTables Prepaid Expenses and Other Current Assets (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosurePrepaidExpensesAndOtherCurrentAssets 34 false false R35.htm 100340 - Disclosure - Property, Plant and Equipment (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentTables Property, Plant and Equipment (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment 35 false false R36.htm 100350 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsTables Goodwill and Intangible Assets (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssets 36 false false R37.htm 100360 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables Accrued Expenses and Other Current Liabilities (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilities 37 false false R38.htm 100370 - Disclosure - Accrued Trade Discounts and Rebates (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedTradeDiscountsAndRebatesTables Accrued Trade Discounts and Rebates (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedTradeDiscountsAndRebates 38 false false R39.htm 100380 - Disclosure - Segment and Other Information (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSegmentAndOtherInformationTables Segment and Other Information (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSegmentAndOtherInformation 39 false false R40.htm 100390 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurements 40 false false R41.htm 100400 - Disclosure - Debt Agreements (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureDebtAgreementsTables Debt Agreements (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureDebtAgreements 41 false false R42.htm 100410 - Disclosure - Derivative Instruments and Hedging Activities (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesTables Derivative Instruments and Hedging Activities (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities1 42 false false R43.htm 100420 - Disclosure - Lease Obligations (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureLeaseObligationsTables Lease Obligations (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureLeaseObligations 43 false false R44.htm 100430 - Disclosure - Share-Based and Long-Term Incentive Plans (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansTables Share-Based and Long-Term Incentive Plans (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlans 44 false false R45.htm 100440 - Disclosure - Income Taxes (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxes 45 false false R46.htm 100450 - Disclosure - Employee Benefit Plans (Tables) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables Employee Benefit Plans (Tables) Tables http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefitPlans 46 false false R47.htm 100460 - Disclosure - Basis of Presentation and Business Overview - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureBasisOfPresentationAndBusinessOverviewAdditionalInformationDetail Basis of Presentation and Business Overview - Additional Information (Detail) Details 47 false false R48.htm 100470 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) Details 48 false false R49.htm 100480 - Disclosure - Summary of Significant Accounting Policies - Depreciation and Amortization Periods for Property, Plant and Equipment (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesDepreciationAndAmortizationPeriodsForPropertyPlantAndEquipmentDetail Summary of Significant Accounting Policies - Depreciation and Amortization Periods for Property, Plant and Equipment (Detail) Details 49 false false R50.htm 100490 - Disclosure - Net Income per Share - Basic and Diluted Net Income per Share (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureNetIncomePerShareBasicAndDilutedNetIncomePerShareDetail Net Income per Share - Basic and Diluted Net Income per Share (Detail) Details 50 false false R51.htm 100500 - Disclosure - Net Income per Share - Schedule of Outstanding Securities Excluded from Computation of Diluted Income per Ordinary Share (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureNetIncomePerShareScheduleOfOutstandingSecuritiesExcludedFromComputationOfDilutedIncomePerOrdinaryShareDetail Net Income per Share - Schedule of Outstanding Securities Excluded from Computation of Diluted Income per Ordinary Share (Detail) Details 51 false false R52.htm 100510 - Disclosure - Net Income per Share - Schedule of Outstanding Securities Excluded from Computation of Diluted Income per Ordinary Share ( Parenthetical) (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureNetIncomePerShareScheduleOfOutstandingSecuritiesExcludedFromComputationOfDilutedIncomePerOrdinaryShareParentheticalDetail Net Income per Share - Schedule of Outstanding Securities Excluded from Computation of Diluted Income per Ordinary Share ( Parenthetical) (Detail) Details 52 false false R53.htm 100520 - Disclosure - Net Income per Share - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureNetIncomePerShareAdditionalInformationDetail Net Income per Share - Additional Information (Detail) Details 53 false false R54.htm 100530 - Disclosure - Acquisitions, Divestitures and Other Arrangements - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsDivestituresAndOtherArrangementsAdditionalInformationDetail Acquisitions, Divestitures and Other Arrangements - Additional Information (Detail) Details 54 false false R55.htm 100540 - Disclosure - Acquisitions, Divestitures and Other Arrangements - Summary of Fair Values of Assets Acquired (Details) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsDivestituresAndOtherArrangementsSummaryOfFairValuesOfAssetsAcquiredDetails Acquisitions, Divestitures and Other Arrangements - Summary of Fair Values of Assets Acquired (Details) Details 55 false false R56.htm 100550 - Disclosure - Acquisitions, Divestitures and Other Arrangements - Schedule of Total Consideration for the Acquisitions (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsDivestituresAndOtherArrangementsScheduleOfTotalConsiderationForAcquisitionsDetail Acquisitions, Divestitures and Other Arrangements - Schedule of Total Consideration for the Acquisitions (Detail) Details 56 false false R57.htm 100560 - Disclosure - Acquisitions, Divestitures and Other Arrangements - Schedule of Total Consideration for the Acquisitions ((Parenthetical) (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsDivestituresAndOtherArrangementsScheduleOfTotalConsiderationForAcquisitionsParentheticalDetail Acquisitions, Divestitures and Other Arrangements - Schedule of Total Consideration for the Acquisitions ((Parenthetical) (Detail) Details 57 false false R58.htm 100570 - Disclosure - Acquisitions, Divestitures and Other Arrangements - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsDivestituresAndOtherArrangementsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail Acquisitions, Divestitures and Other Arrangements - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) Details 58 false false R59.htm 100580 - Disclosure - Acquisitions, Divestitures and Other Arrangements - Summary Of Pro Forma Combined Results (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureAcquisitionsDivestituresAndOtherArrangementsSummaryOfProFormaCombinedResultsDetail Acquisitions, Divestitures and Other Arrangements - Summary Of Pro Forma Combined Results (Detail) Details 59 false false R60.htm 100590 - Disclosure - Inventories - Components of Inventories (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureInventoriesComponentsOfInventoriesDetail Inventories - Components of Inventories (Detail) Details 60 false false R61.htm 100600 - Disclosure - Inventories - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureInventoriesAdditionalInformationDetail Inventories - Additional Information (Detail) Details 61 false false R62.htm 100610 - Disclosure - Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Details) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosurePrepaidExpensesAndOtherCurrentAssetsPrepaidExpensesAndOtherCurrentAssetsDetails Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Details) Details 62 false false R63.htm 100620 - Disclosure - Prepaid Expenses and Other Current Assets - Additional Information (Details) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosurePrepaidExpensesAndOtherCurrentAssetsAdditionalInformationDetails Prepaid Expenses and Other Current Assets - Additional Information (Details) Details 63 false false R64.htm 100630 - Disclosure - Property, Plant and Equipment - Property, Plant and Equipment (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentPropertyPlantAndEquipmentDetail Property, Plant and Equipment - Property, Plant and Equipment (Detail) Details 64 false false R65.htm 100640 - Disclosure - Property, Plant and Equipment - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentAdditionalInformationDetail Property, Plant and Equipment - Additional Information (Detail) Details 65 false false R66.htm 100650 - Disclosure - Goodwill and Intangible Assets - Schedule of Goodwill for Reportable Segments (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfGoodwillForReportableSegmentsDetail Goodwill and Intangible Assets - Schedule of Goodwill for Reportable Segments (Detail) Details 66 false false R67.htm 100660 - Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail Goodwill and Intangible Assets - Additional Information (Detail) Details 67 false false R68.htm 100670 - Disclosure - Goodwill and Intangible Assets - Amortizable Intangible Assets (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsAmortizableIntangibleAssetsDetail Goodwill and Intangible Assets - Amortizable Intangible Assets (Detail) Details 68 false false R69.htm 100680 - Disclosure - Goodwill and Intangible Assets - Amortizable Intangible Assets - (Parenthetical) (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsAmortizableIntangibleAssetsParentheticalDetail Goodwill and Intangible Assets - Amortizable Intangible Assets - (Parenthetical) (Detail) Details 69 false false R70.htm 100690 - Disclosure - Goodwill and Intangible Assets - Estimated Future Amortization Expense (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsEstimatedFutureAmortizationExpenseDetail Goodwill and Intangible Assets - Estimated Future Amortization Expense (Detail) Details 70 false false R71.htm 100700 - Disclosure - Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilitiesScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesDetail Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) Details 71 false false R72.htm 100710 - Disclosure - Accrued Expenses and Other Current Liabilities - Schedule of Changes to Refund Liability (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesScheduleOfChangesToRefundLiabilityDetail Accrued Expenses and Other Current Liabilities - Schedule of Changes to Refund Liability (Detail) Details 72 false false R73.htm 100720 - Disclosure - Accrued Trade Discounts and Rebates - Schedule of Accrued Trade Discounts and Rebates (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedTradeDiscountsAndRebatesScheduleOfAccruedTradeDiscountsAndRebatesDetail Accrued Trade Discounts and Rebates - Schedule of Accrued Trade Discounts and Rebates (Detail) Details 73 false false R74.htm 100730 - Disclosure - Accrued Trade Discounts and Rebates - Schedule of Customer-Related Accruals and Allowances (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureAccruedTradeDiscountsAndRebatesScheduleOfCustomerRelatedAccrualsAndAllowancesDetail Accrued Trade Discounts and Rebates - Schedule of Customer-Related Accruals and Allowances (Detail) Details 74 false false R75.htm 100750 - Disclosure - Segment and Other Information - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSegmentAndOtherInformationAdditionalInformationDetail Segment and Other Information - Additional Information (Detail) Details 75 false false R76.htm 100760 - Disclosure - Segment and Other Information - Summary of Net Sales by Medicine (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureSegmentAndOtherInformationSummaryOfNetSalesByMedicineDetail Segment and Other Information - Summary of Net Sales by Medicine (Detail) Details 76 false false R77.htm 100770 - Disclosure - Segment and Other Information - Summary of Net Sales by Medicine (Parenthetical) (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureSegmentAndOtherInformationSummaryOfNetSalesByMedicineParentheticalDetail Segment and Other Information - Summary of Net Sales by Medicine (Parenthetical) (Detail) Details 77 false false R78.htm 100780 - Disclosure - Segment and Other Information - Schedule of Gross Sales to Customers Included in Reportable Segments and All Other Customers as a Group (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSegmentAndOtherInformationScheduleOfGrossSalesToCustomersIncludedInReportableSegmentsAndAllOtherCustomersAsGroupDetail Segment and Other Information - Schedule of Gross Sales to Customers Included in Reportable Segments and All Other Customers as a Group (Detail) Details 78 false false R79.htm 100790 - Disclosure - Segment and Other Information - Summary of Net Sales Attributed to Geographic Sources (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSegmentAndOtherInformationSummaryOfNetSalesAttributedToGeographicSourcesDetail Segment and Other Information - Summary of Net Sales Attributed to Geographic Sources (Detail) Details 79 false false R80.htm 100800 - Disclosure - Segment and Other Information - Summary of Total Long-Lived Assets by Location (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureSegmentAndOtherInformationSummaryOfTotalLongLivedAssetsByLocationDetail Segment and Other Information - Summary of Total Long-Lived Assets by Location (Detail) Details 80 false false R81.htm 100810 - Disclosure - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurementsAssetsAndLiabilitiesAtFairValueOnRecurringBasisDetail Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Detail) Details 81 false false R82.htm 100830 - Disclosure - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Parenthetical) (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurementsAssetsAndLiabilitiesAtFairValueOnRecurringBasisParentheticalDetail Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Parenthetical) (Detail) Details 82 false false R83.htm 100840 - Disclosure - Debt Agreements - Outstanding Debt Balances (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureDebtAgreementsOutstandingDebtBalancesDetail Debt Agreements - Outstanding Debt Balances (Detail) Details 83 false false R84.htm 100850 - Disclosure - Debt Agreements - Scheduled Maturities of Long-term Debt (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureDebtAgreementsScheduledMaturitiesOfLongTermDebtDetail Debt Agreements - Scheduled Maturities of Long-term Debt (Detail) Details 84 false false R85.htm 100860 - Disclosure - Debt Agreements - Term Loan Facility and Revolving Credit Facility - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureDebtAgreementsTermLoanFacilityAndRevolvingCreditFacilityAdditionalInformationDetail Debt Agreements - Term Loan Facility and Revolving Credit Facility - Additional Information (Detail) Details 85 false false R86.htm 100870 - Disclosure - Debt Agreements - 2027 Senior Notes - Additional Information (Detail) Notes http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureDebtAgreements2027SeniorNotesAdditionalInformationDetail Debt Agreements - 2027 Senior Notes - Additional Information (Detail) Details 86 false false R87.htm 100880 - Disclosure - Derivative Instruments and Hedging Activities - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesAdditionalInformationDetail Derivative Instruments and Hedging Activities - Additional Information (Detail) Details 87 false false R88.htm 100890 - Disclosure - Derivative Instruments and Hedging Activities - Summery of Amounts and Locations of Derivative Instruments on Condensed Consolidated Balance Sheet (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesSummeryOfAmountsAndLocationsOfDerivativeInstrumentsOnCondensedConsolidatedBalanceSheetDe Derivative Instruments and Hedging Activities - Summery of Amounts and Locations of Derivative Instruments on Condensed Consolidated Balance Sheet (Detail) Details 88 false false R89.htm 100900 - Disclosure - Derivative Instruments and Hedging Activities - Summery of Pre-tax Amount and Locations of Derivative Instrument Net Gains (Losses) Recognized in the Condensed Consolidated Statement of Comprehensive Income (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesSummeryOfPretaxAmountAndLocationsOfDerivativeInstrumentNetGainsLossesRecognizedInTheCo Derivative Instruments and Hedging Activities - Summery of Pre-tax Amount and Locations of Derivative Instrument Net Gains (Losses) Recognized in the Condensed Consolidated Statement of Comprehensive Income (Detail) Details 89 false false R90.htm 100910 - Disclosure - Derivative Instruments and Hedging Activities - Summery of Pre-tax Amounts of Gains From Derivative Instruments Recognized in Other Comprehensive Income (Loss) (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesSummeryOfPretaxAmountsOfGainsFromDerivativeInstrumentsRecognizedInOtherComprehensiveInco Derivative Instruments and Hedging Activities - Summery of Pre-tax Amounts of Gains From Derivative Instruments Recognized in Other Comprehensive Income (Loss) (Detail) Details 90 false false R91.htm 100930 - Disclosure - Lease Obligations - Schedule of Office Space Lease Agreements in Place for Real Properties (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureLeaseObligationsScheduleOfOfficeSpaceLeaseAgreementsInPlaceForRealPropertiesDetail Lease Obligations - Schedule of Office Space Lease Agreements in Place for Real Properties (Detail) Details 91 false false R92.htm 100940 - Disclosure - Lease Obligations - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureLeaseObligationsAdditionalInformationDetail Lease Obligations - Additional Information (Detail) Details 92 false false R93.htm 100950 - Disclosure - Lease Obligations - Schedule of Lease Liabilities Recorded on the Balance Sheet (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureLeaseObligationsScheduleOfLeaseLiabilitiesRecordedOnBalanceSheetDetail Lease Obligations - Schedule of Lease Liabilities Recorded on the Balance Sheet (Detail) Details 93 false false R94.htm 100960 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 94 false false R95.htm 100970 - Disclosure - Shareholders' Equity - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareholdersEquityAdditionalInformationDetail Shareholders' Equity - Additional Information (Detail) Details 95 false false R96.htm 100980 - Disclosure - Share-Based and Long-Term Incentive Plans - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansAdditionalInformationDetail Share-Based and Long-Term Incentive Plans - Additional Information (Detail) Details 96 false false R97.htm 100990 - Disclosure - Share-Based and Long-Term Incentive Plans - Estimated Fair Value of Converted Stock Options Using Hull-White Model in Binomial Lattice Option Pricing Framework (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansEstimatedFairValueOfConvertedStockOptionsUsingHullWhiteModelInBinomialLatticeOptionPricingFrameworkDetail Share-Based and Long-Term Incentive Plans - Estimated Fair Value of Converted Stock Options Using Hull-White Model in Binomial Lattice Option Pricing Framework (Detail) Details 97 false false R98.htm 101000 - Disclosure - Share-Based and Long-Term Incentive Plans - Summary of Stock Option Activity (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansSummaryOfStockOptionActivityDetail Share-Based and Long-Term Incentive Plans - Summary of Stock Option Activity (Detail) Details 98 false false R99.htm 101010 - Disclosure - Share-Based and Long-Term Incentive Plans - Summary of Outstanding Stock Options (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansSummaryOfOutstandingStockOptionsDetail Share-Based and Long-Term Incentive Plans - Summary of Outstanding Stock Options (Detail) Details 99 false false R100.htm 101030 - Disclosure - Share-Based and Long-Term Incentive Plans - Summary of Restricted Stock Unit Activity (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansSummaryOfRestrictedStockUnitActivityDetail Share-Based and Long-Term Incentive Plans - Summary of Restricted Stock Unit Activity (Detail) Details 100 false false R101.htm 101040 - Disclosure - Share-Based and Long-Term Incentive Plans - Summary of Performance Stock Unit Awards Activity (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansSummaryOfPerformanceStockUnitAwardsActivityDetail Share-Based and Long-Term Incentive Plans - Summary of Performance Stock Unit Awards Activity (Detail) Details 101 false false R102.htm 101050 - Disclosure - Share-Based and Long-Term Incentive Plans - Summary of Performance Stock Unit Awards Activity - (Parenthetical) (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansSummaryOfPerformanceStockUnitAwardsActivityParentheticalDetail Share-Based and Long-Term Incentive Plans - Summary of Performance Stock Unit Awards Activity - (Parenthetical) (Detail) Details 102 false false R103.htm 101060 - Disclosure - Share-Based and Long-Term Incentive Plans - Summary of Significant Valuation Assumptions Related to 2022 Relative TSR PSUs (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureSharebasedAndLongtermIncentivePlansSummaryOfSignificantValuationAssumptionsRelatedTo2022RelativeTsrPsusDetail Share-Based and Long-Term Incentive Plans - Summary of Significant Valuation Assumptions Related to 2022 Relative TSR PSUs (Detail) Details 103 false false R104.htm 101070 - Disclosure - Share-Based and Long-Term Incentive Plans - Summary of Stock-Based Compensation Expense (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureShareBasedAndLongTermIncentivePlansSummaryOfStockBasedCompensationExpenseDetail Share-Based and Long-Term Incentive Plans - Summary of Stock-Based Compensation Expense (Detail) Details 104 false false R105.htm 101080 - Disclosure - Income Taxes - Company's Income Before Expense (Benefit) for Income Taxes by Jurisdiction (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureIncomeTaxesCompanysIncomeBeforeExpenseBenefitForIncomeTaxesByJurisdictionDetail Income Taxes - Company's Income Before Expense (Benefit) for Income Taxes by Jurisdiction (Detail) Details 105 false false R106.htm 101090 - Disclosure - Income Taxes - Components of Expense (Benefit) for Income Taxes (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureIncomeTaxesComponentsOfExpenseBenefitForIncomeTaxesDetail Income Taxes - Components of Expense (Benefit) for Income Taxes (Detail) Details 106 false false R107.htm 101100 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 107 false false R108.htm 101110 - Disclosure - Income Taxes - Reconciliation Between Irish Statutory Income Tax Rate and U.S Federal Statutory Income Tax Rate (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesReconciliationBetweenIrishStatutoryIncomeTaxRateAndUSFederalStatutoryIncomeTaxRateDetail Income Taxes - Reconciliation Between Irish Statutory Income Tax Rate and U.S Federal Statutory Income Tax Rate (Detail) Details 108 false false R109.htm 101120 - Disclosure - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesSignificantComponentsOfDeferredTaxAssetsAndLiabilitiesDetail Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) Details 109 false false R110.htm 101130 - Disclosure - Income Taxes - Reconciliation of Beginning and Ending Amounts of Valuation Allowance (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesReconciliationOfBeginningAndEndingAmountsOfValuationAllowanceDetail Income Taxes - Reconciliation of Beginning and Ending Amounts of Valuation Allowance (Detail) Details 110 false false R111.htm 101140 - Disclosure - Income Taxes - Changes in Uncertain Income Tax Positions (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesChangesInUncertainIncomeTaxPositionsDetail Income Taxes - Changes in Uncertain Income Tax Positions (Detail) Details 111 false false R112.htm 101150 - Disclosure - Employee Benefit Plans - Summary of Changes in Benefit Obligation (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansSummaryOfChangesInBenefitObligationDetail Employee Benefit Plans - Summary of Changes in Benefit Obligation (Detail) Details 112 false false R113.htm 101160 - Disclosure - Employee Benefit Plans - Additional Information (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAdditionalInformationDetail Employee Benefit Plans - Additional Information (Detail) Details 113 false false R114.htm 101170 - Disclosure - Employee Benefit Plans - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfAmountsRecognizedInConsolidatedBalanceSheetsDetail Employee Benefit Plans - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) Details 114 false false R115.htm 101180 - Disclosure - Employee Benefit Plans - Summary of Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansSummaryOfAmountsRecognizedInAccumulatedOtherComprehensiveLossDetail Employee Benefit Plans - Summary of Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) Details 115 false false R116.htm 101190 - Disclosure - Employee Benefit Plans - Summary of Total Benefit Payments, Which Reflect Expected Future Service, Expected to Be Paid to Plan Participants (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansSummaryOfTotalBenefitPaymentsWhichReflectExpectedFutureServiceExpectedToBePaidToPlanParticipantsDetail Employee Benefit Plans - Summary of Total Benefit Payments, Which Reflect Expected Future Service, Expected to Be Paid to Plan Participants (Detail) Details 116 false false R117.htm 101200 - Disclosure - Employee Benefit Plans - Summary of Net Period Benefit Cost Recognized and Amounts Recognized in Other Comprehensive (Income) Loss (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfNetPeriodBenefitCostRecognizedAndAmountsRecognizedInOtherComprehensiveIncomeLossDetail Employee Benefit Plans - Summary of Net Period Benefit Cost Recognized and Amounts Recognized in Other Comprehensive (Income) Loss (Detail) Details 117 false false R118.htm 101210 - Disclosure - Employee Benefit Plans - Summary of Weighted-Average Assumptions and Health Care Cost Trend Rates Used to Determine Benefit Obligation (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfWeightedaverageAssumptionsAndHealthCareCostTrendRatesUsedToDetermineBenefitObligationDetail Employee Benefit Plans - Summary of Weighted-Average Assumptions and Health Care Cost Trend Rates Used to Determine Benefit Obligation (Detail) Details 118 false false R119.htm 101220 - Disclosure - Employee Benefit Plans - Summary of Weighted-Average Assumptions and Health Care Cost Trend Rates Used to Determine Net Periodic Benefit Costs (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfWeightedaverageAssumptionsAndHealthCareCostTrendRatesUsedToDetermineNetPeriodicBenefitCostsDetail Employee Benefit Plans - Summary of Weighted-Average Assumptions and Health Care Cost Trend Rates Used to Determine Net Periodic Benefit Costs (Detail) Details 119 false false R120.htm 101230 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Detail) Sheet http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccountsDetail Schedule II - Valuation and Qualifying Accounts (Detail) Details http://www.horizontherapeutics.com/20221231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccounts 120 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 3 fact(s) appearing in ix:hidden were eligible for transformation: dei:CurrentFiscalYearEndDate, hznp:RestrictedStockAwardsVestingPeriod, us-gaap:FiniteLivedIntangibleAssetUsefulLife - hznp-20221231.htm 8 hznp-20221231.htm hznp-20221231.xsd hznp-20221231_cal.xml hznp-20221231_def.xml hznp-20221231_lab.xml hznp-20221231_pre.xml hznp-ex10_13.htm hznp-ex10_3.htm hznp-ex10_56.htm hznp-ex10_57.htm hznp-ex21_1.htm hznp-ex23_1.htm hznp-ex31_1.htm hznp-ex31_2.htm hznp-ex32_1.htm hznp-ex32_2.htm img127996310_0.jpg img127996310_1.jpg http://fasb.org/srt/2022 http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true