Summary of Significant Accounting Polices and Adoption of New Accounting Pronouncements	6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND ADOPTION OF NEW ACCOUNTING PRONOUNCEMENTS	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND ADOPTION OF NEW ACCOUNTING PRONOUNCEMENTS REVENUE RECOGNITION—In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASC Topic 606, Revenue from Contracts with Customers, which introduced a new five step model to recognize revenue from customer contracts in an effort to increase consistency and comparability throughout global capital markets and across industries. The model identifies the contract, any separate performance obligations in the contract, determines the transaction price, allocates the transaction price and recognizes revenue when the performance obligations are satisfied. Management has concluded that, with the exception of carried interests and incentive fees, the nature of the Company's revenue streams is such that the requirements are generally satisfied at the time that the fee becomes receivable. Consequently, the new standard did not impact the timing of revenue recognition for these revenue streams. The Company has concluded that carried interests, which are a performance-based capital allocation to the Company based on cumulative fund performance to-date, represent equity method investments that are not in the scope of the amended revenue recognition guidance. Effective January 1, 2018, the Company changed its policy for recognition and measurement of performance fees. This accounting policy change did not change the timing or amount of income recognized related to performance fees. Prior to this accounting method change, the performance-based component of the fees was recognized within investment management, property services and research fees in the Consolidated Statements of Operations. Under the equity method of accounting, the Company now recognizes its allocation of performance fees along with its share of income or loss and fair value, proportionate to the Company’s equity ownership in each applicable investment as a component of income from unconsolidated investments. The Company has accounted for this change by full retrospective application and prior periods presented have been recast. The impact of adoption was a reclassification of $32.9 million from other assets to unconsolidated investments on the consolidated balance sheet as of December 31, 2017. During the three and six months ended June 30, 2018, there was $6.9 million and $17.2 million of performance-based carried interest allocations recorded as a component of income from unconsolidated investments. During the three and six months ended June 30, 2017, there was $(2.6) million and $3.9 million of performance fee allocations which were previously presented as a component of investment management, property services and research fees and have been reclassified to income from unconsolidated investments in the current year presentation. ASC Subtopic 610-20, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets ("Subtopic 610-20") was also adopted effective January 1, 2018. Management concluded that the new standard did not have a significant impact on the amount, timing or classification of real estate sales in the financial statements or related disclosures. This conclusion was based on the Company's current business mix and general approach to sales of real estate which are generally completed without seller financing or continuing involvement that would indicate that a performance obligation is not met at the time the transaction closes. With the adoption of Subtopic 610-20 the Company will recognize the entire gain attributed to contributions of real estate properties to unconsolidated entities. The Company previously recognized a gain on contribution only to the extent of the third-party ownership in the unconsolidated entity acquiring the property and deferred the portion of the gain related to the Company's ownership. The Company’s analysis included evaluation of an in-process development project that will be completed later in 2018 and found that while the evaluation is different under Subtopic 610-20, the recognition required recording the gain on the sale of the land and the development component, as separate performance obligations, under a percentage of completion methodology. However, this conclusion is identical to the manner of reporting the gain on the sale of this real estate under the superseded U.S. GAAP. Consequently, there was no significant impact upon this sale nor any of the other sales already completed. REAL ESTATE ACQUISITIONS—The purchase price of acquired properties is recorded to land, buildings and building improvements and intangible lease value (value of above-market and below-market leases, acquired in-place lease values, and tenant relationships, if any). The ownership of the other interest holders in consolidated subsidiaries is reflected as noncontrolling interests. The valuations of real estate are based on management estimates of the real estate assets using income and market approaches. The indebtedness securing the real estate is valued, in part, based on third party valuations and management estimates also using an income approach. FOREIGN CURRENCIES—The financial statements of Kennedy Wilson's subsidiaries located outside the United States are measured using the local currency as this is their functional currency. The assets and liabilities of these subsidiaries are translated at the rates of exchange at the balance sheet date, and income and expenses are translated at the average monthly rate. The foreign currencies include the euro and the British pound sterling. Cumulative translation adjustments, to the extent not included in cumulative net income, are included in the consolidated statement of equity as a component of accumulated other comprehensive income. Investment level debt is generally incurred in local currencies. Fluctuations in foreign exchanges rates may have a significant impact on the results of our operations. In order to manage the effect of these fluctuations, the Company enters into hedging transactions, in the form of currency derivative contracts, that are designed to reduce its book equity exposure to foreign currencies. See Note 6 for a complete discussion on currency derivative contracts. FAIR VALUE MEASUREMENTS — Kennedy Wilson accounts for fair value measurements of financial assets and financial liabilities and for fair value measurements of non-financial items that are recognized or disclosed at fair value in the financial statements on a recurring basis under the provisions of Fair Value Measurements ASC Subtopic 820-10. Subtopic 820-10 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When estimating fair value in the absence of an orderly transaction between market participants, valuations of real estate are based on management estimates of the real estate assets using income and market approaches. The indebtedness securing the real estate and the investments in debt securities are valued, in part, based on third party valuations and management estimates also using an income approach. FAIR VALUE OF FINANCIAL INSTRUMENTS — The estimated fair value of financial instruments is determined using available market information and appropriate valuation methodologies. Considerable judgment, however, is necessary to interpret market data and develop the related estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts that could be realized upon disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material impact on the estimated fair value amounts. DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES—All derivative instruments are recognized as either assets or liabilities in the balance sheet at their respective fair values. For derivatives designated in hedging relationships, changes in fair value of cash flow hedges or net investment hedges are recognized in accumulated other comprehensive income, to the extent the derivative is effective at offsetting the changes in the item being hedged until the hedged item affects earnings. Changes in fair value for fair value hedges are recognized in earnings. Fluctuations in foreign exchanges rates may have a significant impact on the Company's results of operations. In order to manage the potential exposure from adverse changes in foreign exchange rates arising from the Company’s net investments in foreign operations, the Company may enter into currency derivative contracts to hedge all or portions of the net investments in the Company’s non-U.S. dollar denominated foreign operations. INCOME TAXES—Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. In accordance with ASC Subtopic 740-10, Accounting for Uncertainty in Income Taxes, the effect of income tax positions is recognized only if those positions are more likely than not to be sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. RECENT ACCOUNTING PRONOUNCEMENTS—On January 1, 2018, Kennedy Wilson adopted ASC Topic 606 and ASC Subtopic 610-20 transition guidance. See discussion above in revenue recognition for more detail. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 is required to be adopted for fiscal years beginning after December 15, 2018. Because Kennedy Wilson's existing operating lease commitments are not material and the accounting for leases by the lessor is substantially unchanged, the Company does not expect the ASU to have a significant impact on its results of operations or financial position. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, which addresses eight classification issues related to the statement of cash flows: (a) debt prepayment or debt extinguishment costs, (b) settlement of zero-coupon bonds, (c) contingent consideration payments made after a business combination (d) proceeds from the settlement of insurance claims, (e) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, (f) distributions received from equity method investees, (g) beneficial interests in securitization transactions, and (h) separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is required to be adopted for public entities for fiscal years beginning after December 15, 2017. The adoption of this standard did not have a material impact on Kennedy Wilson's consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The ASU clarifies the definition of a business. The three elements of a business (inputs, processes, and outputs) has not changed, however, the amendment provides a framework to assist entities in evaluating whether these elements are present. The amended framework is not expected to materially impact the Company’s financial statements. However, the amendment also includes a provision that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. Therefore, real estate acquisitions generally will no longer be considered a business and consequently not be accounted for under Topic 805. The Company has evaluated the impact noting that for asset acquisitions (1) acquisition related costs will no longer be expensed as incurred and (2) regardless of the market value of a property at the acquisition date, acquisition related gains will no longer be recorded. ASU 2017-01 is required to be adopted for public entities for fiscal years beginning after December 15, 2017. The adoption of this standard did not have a material impact on Kennedy Wilson's consolidated financial statements, except that going forward the Company will no longer record acquisition related gains when acquiring controlling interests in real estate investments that are deemed asset acquisitions. In January 2017, the FASB issued ASU 2017-04, which requires an entity to no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment will be measured using the difference between the carrying amount and the fair value of the reporting unit. ASU 2017-04 is required to be adopted for public entities that are SEC filers, for annual and interim periods in fiscal years beginning after December 15, 2019. The Company does not expect the ASU to have a significant impact on Kennedy Wilson's consolidated financial statements. In August 2017, the FASB issued ASU 2017-12 that simplifies the application of hedge accounting guidance in current GAAP and improves the reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its consolidated financial statements. Among the simplification updates, the standard eliminates the requirement in current GAAP to separately recognize periodic hedge ineffectiveness. Mismatches between the changes in value of the hedged item and hedging instrument may still occur but they will no longer be separately reported. The standard requires the presentation of the earnings effect of the hedging instrument in the same income statement line item in which the earnings effect of the hedged item is reported. This ASU is effective for public business entities, for annual and interim periods in fiscal years beginning after December 15, 2018. The Company does not expect the ASU to have a significant impact on Kennedy Wilson's consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. This ASU is effective for all entities, for annual and interim periods in fiscal years beginning after December 15, 2018. The Company does not expect the ASU to have a significant impact on Kennedy Wilson's consolidated financial statements. The FASB did not issue any other ASUs during the first six months of 2018 that the Company expects to be applicable and have a material impact on the Company's financial position or results of operations. RECLASSIFICATIONS—Certain balances included in prior year's financial statements have been reclassified to conform to the current year's presentation.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND ADOPTION OF NEW ACCOUNTING PRONOUNCEMENTS

REVENUE RECOGNITION—In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASC Topic 606, Revenue from Contracts with Customers, which introduced a new five step model to recognize revenue from customer contracts in an effort to increase consistency and comparability throughout global capital markets and across industries. The model identifies the contract, any separate performance obligations in the contract, determines the transaction price, allocates the transaction price and recognizes revenue when the performance obligations are satisfied. Management has concluded that, with the exception of carried interests and incentive fees, the nature of the Company's revenue streams is such that the requirements are generally satisfied at the time that the fee becomes receivable. Consequently, the new standard did not impact the timing of revenue recognition for these revenue streams.

The Company has concluded that carried interests, which are a performance-based capital allocation to the Company based on cumulative fund performance to-date, represent equity method investments that are not in the scope of the amended revenue recognition guidance. Effective January 1, 2018, the Company changed its policy for recognition and measurement of performance fees. This accounting policy change did not change the timing or amount of income recognized related to performance fees. Prior to this accounting method change, the performance-based component of the fees was recognized within investment management, property services and research fees in the Consolidated Statements of Operations. Under the equity method of accounting, the Company now recognizes its allocation of performance fees along with its share of income or loss and fair value, proportionate to the Company’s equity ownership in each applicable investment as a component of income from unconsolidated investments. The Company has accounted for this change by full retrospective application and prior periods presented have been recast. The impact of adoption was a reclassification of $32.9 million from other assets to unconsolidated investments on the consolidated balance sheet as of December 31, 2017. During the three and six months ended June 30, 2018, there was $6.9 million and $17.2 million of performance-based carried interest allocations recorded as a component of income from unconsolidated investments. During the three and six months ended June 30, 2017, there was $(2.6) million and $3.9 million of performance fee allocations which were previously presented as a component of investment management, property services and research fees and have been reclassified to income from unconsolidated investments in the current year presentation.

ASC Subtopic 610-20, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets ("Subtopic 610-20") was also adopted effective January 1, 2018. Management concluded that the new standard did not have a significant impact on the amount, timing or classification of real estate sales in the financial statements or related disclosures. This conclusion was based on the Company's current business mix and general approach to sales of real estate which are generally completed without seller financing or continuing involvement that would indicate that a performance obligation is not met at the time the transaction closes. With the adoption of Subtopic 610-20 the Company will recognize the entire gain attributed to contributions of real estate properties to unconsolidated entities. The Company previously recognized a gain on contribution only to the extent of the third-party ownership in the unconsolidated entity acquiring the property and deferred the portion of the gain related to the Company's ownership.

The Company’s analysis included evaluation of an in-process development project that will be completed later in 2018 and found that while the evaluation is different under Subtopic 610-20, the recognition required recording the gain on the sale of the land and the development component, as separate performance obligations, under a percentage of completion methodology. However, this conclusion is identical to the manner of reporting the gain on the sale of this real estate under the superseded U.S. GAAP. Consequently, there was no significant impact upon this sale nor any of the other sales already completed.

REAL ESTATE ACQUISITIONS—The purchase price of acquired properties is recorded to land, buildings and building improvements and intangible lease value (value of above-market and below-market leases, acquired in-place lease values, and tenant relationships, if any). The ownership of the other interest holders in consolidated subsidiaries is reflected as noncontrolling interests.

The valuations of real estate are based on management estimates of the real estate assets using income and market approaches. The indebtedness securing the real estate is valued, in part, based on third party valuations and management estimates also using an income approach.

FOREIGN CURRENCIES—The financial statements of Kennedy Wilson's subsidiaries located outside the United States are measured using the local currency as this is their functional currency. The assets and liabilities of these subsidiaries are translated at the rates of exchange at the balance sheet date, and income and expenses are translated at the average monthly rate. The foreign currencies include the euro and the British pound sterling. Cumulative translation adjustments, to the extent not included in cumulative net income, are included in the consolidated statement of equity as a component of accumulated other comprehensive income.

Investment level debt is generally incurred in local currencies. Fluctuations in foreign exchanges rates may have a significant impact on the results of our operations. In order to manage the effect of these fluctuations, the Company enters into hedging transactions, in the form of currency derivative contracts, that are designed to reduce its book equity exposure to foreign currencies. See Note 6 for a complete discussion on currency derivative contracts.

FAIR VALUE MEASUREMENTS — Kennedy Wilson accounts for fair value measurements of financial assets and financial liabilities and for fair value measurements of non-financial items that are recognized or disclosed at fair value in the financial statements on a recurring basis under the provisions of Fair Value Measurements ASC Subtopic 820-10. Subtopic 820-10 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When estimating fair value in the absence of an orderly transaction between market participants, valuations of real estate are based on management estimates of the real estate assets using income and market approaches. The indebtedness securing the real estate and the investments in debt securities are valued, in part, based on third party valuations and management estimates also using an income approach.

FAIR VALUE OF FINANCIAL INSTRUMENTS — The estimated fair value of financial instruments is determined using available market information and appropriate valuation methodologies. Considerable judgment, however, is necessary to interpret market data and develop the related estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts that could be realized upon disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material impact on the estimated fair value amounts.

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES—All derivative instruments are recognized as either assets or liabilities in the balance sheet at their respective fair values. For derivatives designated in hedging relationships, changes in fair value of cash flow hedges or net investment hedges are recognized in accumulated other comprehensive income, to the extent the derivative is effective at offsetting the changes in the item being hedged until the hedged item affects earnings. Changes in fair value for fair value hedges are recognized in earnings.

Fluctuations in foreign exchanges rates may have a significant impact on the Company's results of operations. In order to manage the potential exposure from adverse changes in foreign exchange rates arising from the Company’s net investments in foreign operations, the Company may enter into currency derivative contracts to hedge all or portions of the net investments in the Company’s non-U.S. dollar denominated foreign operations.

INCOME TAXES—Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. In accordance with ASC Subtopic 740-10, Accounting for Uncertainty in Income Taxes, the effect of income tax positions is recognized only if those positions are more likely than not to be sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs.

RECENT ACCOUNTING PRONOUNCEMENTS—On January 1, 2018, Kennedy Wilson adopted ASC Topic 606 and ASC Subtopic 610-20 transition guidance. See discussion above in revenue recognition for more detail.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 is required to be adopted for fiscal years beginning after December 15, 2018. Because Kennedy Wilson's existing operating lease commitments are not material and the accounting for leases by the lessor is substantially unchanged, the Company does not expect the ASU to have a significant impact on its results

of operations or financial position.

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, which addresses eight classification issues related to the statement of cash flows: (a) debt prepayment or debt extinguishment costs, (b) settlement of zero-coupon bonds, (c) contingent consideration payments made after a business combination (d) proceeds from the settlement of insurance claims, (e) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, (f) distributions received from equity method investees, (g) beneficial interests in securitization transactions, and (h) separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is required to be adopted for public entities for fiscal years beginning after December 15, 2017. The adoption of this standard did not have a material impact on Kennedy Wilson's consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The ASU clarifies the definition of a business. The three elements of a business (inputs, processes, and outputs) has not changed, however, the amendment provides a framework to assist entities in evaluating whether these elements are present. The amended framework is not expected to materially impact the Company’s financial statements. However, the amendment also includes a provision that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. Therefore, real estate acquisitions generally will no longer be considered a business and consequently not be accounted for under Topic 805. The Company has evaluated the impact noting that for asset acquisitions (1) acquisition related costs will no longer be expensed as incurred and (2) regardless of the market value of a property at the acquisition date, acquisition related gains will no longer be recorded. ASU 2017-01 is required to be adopted for public entities for fiscal years beginning after December 15, 2017. The adoption of this standard did not have a material impact on Kennedy Wilson's consolidated financial statements, except that going forward the Company will no longer record acquisition related gains when acquiring controlling interests in real estate investments that are deemed asset acquisitions.

In January 2017, the FASB issued ASU 2017-04, which requires an entity to no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment will be measured using the difference between the carrying amount and the fair value of the reporting unit. ASU 2017-04 is required to be adopted for public entities that are SEC filers, for annual and interim periods in fiscal years beginning after December 15, 2019. The Company does not expect the ASU to have a significant impact on Kennedy Wilson's consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12 that simplifies the application of hedge accounting guidance in current GAAP and improves the reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its consolidated financial statements. Among the simplification updates, the standard eliminates the requirement in current GAAP to separately recognize periodic hedge ineffectiveness. Mismatches between the changes in value of the hedged item and hedging instrument may still occur but they will no longer be separately reported. The standard requires the presentation of the earnings effect of the hedging instrument in the same income statement line item in which the earnings effect of the hedged item is reported. This ASU is effective for public business entities, for annual and interim periods in fiscal years beginning after December 15, 2018. The Company does not expect the ASU to have a significant impact on Kennedy Wilson's consolidated financial statements.

In February 2018, the FASB issued ASU 2018-02, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. This ASU is effective for all entities, for annual and interim periods in fiscal years beginning after December 15, 2018. The Company does not expect the ASU to have a significant impact on Kennedy Wilson's consolidated financial statements.

The FASB did not issue any other ASUs during the first six months of 2018 that the Company expects to be applicable and have a material impact on the Company's financial position or results of operations.

RECLASSIFICATIONS—Certain balances included in prior year's financial statements have been reclassified to conform to the current year's presentation.