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Swaps Interest Rate Swap [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Payment of deferred loan costs Payments of Financing Costs LONG-LIVED ASSETS Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Total (loss) income from unconsolidated investments (Income) loss from unconsolidated investments Equity income pickup Income (loss) from unconsolidated investments Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] Basic loss (income) per share Earnings Per Share, Basic [Abstract] 2029 Lessor, Operating Lease, Payment to be Received, Year Four Schedule of Dividends Declared and Paid Dividends Declared [Table Text Block] RECENT ACCOUNTING PRONOUNCEMENTS New Accounting Pronouncements, Policy [Policy Text Block] Equity Method Investments Closed-End Funds Equity Method Investments Closed-End Funds [Member] Equity Method Investments Closed-End Funds [Member] Maximum adjusted secured leverage ratio Debt Instrument, Covenant, Adjusted Secured Leverage Ratio, Maximum Debt Instrument, Covenant, Adjusted Secured Leverage Ratio, Maximum Leasing commissions, net of accumulated amortization of $15.3 and $13.5 at June 30, 2025 and December 31, 2024, respectively Deferred Costs, Leasing, Net Number of leases Lessee, Operating Lease, Number Of Leases Lessee, Operating Lease, Number Of Leases Foreign Exchange Contract, Four Foreign Exchange Contract, Four [Member] Foreign Exchange Contract, Four [Member] (Loss) income from unconsolidated investments - fair value Gain (Loss) On Equity Method Investments Gain (Loss) on Equity Method Investments Property-Level Loan, Secured By Northern California Office Building Property-Level Loan, Secured By Northern California Office Building [Member] Property-Level Loan, Secured By Northern California Office Building Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Loss (income) per share (in dollars per share) Basic loss per basic share (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Preferred dividends paid Preferred Stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Discount Rates Measurement Input, Discount Rate [Member] Total other comprehensive income (loss) for the period Other Comprehensive Income (Loss), Net of Tax Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Investment Management Fees, Related Party Investment Management Fees, Related Party [Member] Investment Management Fees, Related Party Measurement Input Type [Domain] Measurement Input Type [Domain] Compensation and related Compensation And Related [Member] Compensation And Related [Member] Number of portfolios included in 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noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Carried interest compensation payments Payment Of Performance Allocation Payment Of Performance Allocation Accounting Policies [Abstract] Accounting Policies [Abstract] Above-market leases, net of accumulated amortization of $40.4 and $38.5 at June 30, 2025 and December 31, 2024, respectively Finite-Lived Intangible Assets, Net KWE Euro Medium Term Note Programme Euro Medium Term Note [Member] Euro Medium Term Note [Member] Schedule of Future Minimum Rental Payments for Operating Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Restricted Stock Restricted Stock [Member] Repayment of mortgage debt Repayments of Secured Debt Principal co-investments Equity Method Investments, Principal Investments Equity Method Investments, Principal Investments Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] VHH Vintage Housing Holdings [Member] Vintage Housing Holdings [Member] 2025 (remainder) Long-Term Debt, Gross, Maturities, Repayments Of Principal, Remainder Of Fiscal Year Long-Term Debt, Gross, Maturities, Repayments Of Principal, Remainder Of Fiscal Year Right of use asset, net Operating Lease, Liability Noncontrolling interests AOCI Including Portion Attributable to Noncontrolling Interest, Period Increase (Decrease) Series B Cumulative Preferred Stock Series B Preferred Stock [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Total Lessor, 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Floating Rate Without Interest Caps Interest Expense Interest Expense, Operating Comprehensive income (loss) attributable to Kennedy-Wilson Holdings, Inc. 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Investment debt from VIEs Total Debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Multifamily - Affordable Multifamily, Affordable [Member] Multifamily, Affordable Total assets Assets from VIEs Total assets Assets Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Real Estate [Table] Real Estate [Table] Geographical [Domain] Geographical [Domain] Schedule of (Loss) Income from Unconsolidated Investments Schedule Of Income (Loss) From Unconsolidated Investments [Table Text Block] Schedule Of Income (Loss) From Unconsolidated Investments Term of extension options Debt Instrument, Extension Option, Term Debt Instrument, Extension Option, Term Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other segment items Segment Reporting, Other Segment Item, Amount Weighted average lease term Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life 2030 Notes 4.750% Senior Notes Due 2030 [Member] 4.750% Senior Notes Due 2030 Effect of currency exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Real estate, gross Real Estate Investment Property, at Cost Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Increase (decrease) related to other items Income (Loss) From Unconsolidated Investments, Other Income (Loss) From Unconsolidated Investments, Other Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] (Loss) income from consolidated subsidiaries Income (Loss) From Consolidated Subsidiaries Income (Loss) From Consolidated 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on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] GUARANTOR AND NON-GARANTOR FINANCIAL STATEMENTS Condensed Financial Statements [Text Block] Deferred compensation Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accumulated amortization of leasing commissions Deferred Costs, Leasing, Accumulated Amortization Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] 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Related party accounts receivable, net Accounts receivable Accounts Receivable, after Allowance for Credit Loss Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Residential, Hotel and Other Residential, Hotel And Other [Member] Residential, Hotel And Other Operating distributions from unconsolidated investments Proceeds From Unconsolidated Investments, Dividends Or Distributions Proceeds from Unconsolidated Investments, Dividends or Distributions Measurement inputs Alternative Investment, Measurement Input Schedule of Mortgage Debt Schedule of Long-Term Debt Instruments [Table Text Block] Ireland Office Building Ireland Office Building [Member] Ireland Office Building Total expenses Total expenses Costs and Expenses Total assets Segment Reporting Information, Assets [Abstract] Segment Reporting Information, Assets [Abstract] Document Quarterly Report Document Quarterly Report Provision for credit losses 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