Accounting Policies (Policy)	6 Months Ended
Accounting Policies (Policy)	Jun. 30, 2016
Accounting Policies [Abstract]
Basis of Accounting and Consolidation	Basis of Accounting and Consolidation The unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with rules and regulations of the Securities and Exchange Commission and consolidate the financial statements of the Parent and all of its controlled subsidiaries. In the opinion of management, the financial statements reflect all adjustments, consisting of normal recurring accruals, which are necessary for the fair statement of the financial condition and results of operations for the periods presented. All significant intercompany transactions, balances, revenues and expenses are eliminated upon consolidation. The company provides investment management services to, and has transactions with, various private equity funds, real estate funds, fund-of-funds, CLOs, and other investment products sponsored by the company in the normal course of business for the investment of client assets. The company serves as the investment manager, making day-to-day investment decisions concerning the assets of these products. In addition to consolidating the financial statements of the Parent and all of its controlled subsidiaries, the Condensed Consolidated Financial Statements include the consolidation of certain investment products (“Consolidated Investment Products” or "CIP") that meet the definition of either a voting rights entity (“VOE”), if the company is deemed to have a controlling financial interest in the fund, or a variable interest entity (“VIE”) if the company has been deemed to be the primary beneficiary of the fund. At June 30, 2016, all CIP were VIEs. Certain of these investment products, typically CLOs, funds that are structured as partnership entities (such as private equity funds, real estate funds, and fund-of-funds), and certain non-U.S. mutual funds, are considered, for accounting and consolidation analysis purposes, to be VIEs if the VIE criteria are met. A VIE, in the context of the company and its managed funds, is a fund that does not have sufficient equity to finance its operations without additional subordinated financial support, or a fund for which the risks and rewards of ownership are not directly linked to voting interests. If the company is deemed to have the power to direct the activities of the fund that most significantly impact the fund's economic performance, and the obligation to absorb losses/right to receive benefits from the fund that could potentially be significant to the fund, then the company is deemed to be the fund's primary beneficiary and is required to consolidate the fund. The company's economic risk with respect to each investment in a CIP is limited to its equity ownership and any uncollected management and performance fees. See Note 13, "Consolidated Investment Products," for additional information regarding the impact of CIP. Consolidation Analysis The company inventories its funds by vehicle type on a quarterly basis. The company assesses modifications to existing funds on an ongoing basis to determine if a significant reconsideration event has occurred. The consolidation analysis includes a detailed review of the terms of the fund's governing documents and a comparison of the significant terms against the consolidation criteria in ASC 810, including a determination of whether the fund is a VIE or a VOE. Seed money and co-investments in managed funds in which the company has determined that it is the primary beneficiary or in which the company has a controlling financial interest are consolidated if the impact of doing so is deemed material. Otherwise, these investments are accounted for as described in the “Investments” accounting policy in the Form 10-K for the year-ended December 31, 2015. Upon consolidation of CLOs, the company's and the funds' accounting policies are effectively aligned, resulting in the reclassification of the company's gain or loss (representing the changes in the market value of the company's holding in the consolidated fund) from other comprehensive income into other gains/losses. The company's gain or loss on its investment (before consolidation) eliminates with the company's share of the offsetting loss or gain on the fund. The net impact from consolidation of funds previously carried as available for sale investments to net income attributable to Invesco Ltd. in each period primarily represents the changes in the value of the company's holding in its consolidated CLOs. Consolidation of CLOs A significant portion of VIEs are CLOs. CLOs are investment vehicles created for the sole purpose of issuing collateralized loan instruments that offer investors the opportunity for returns that vary with the risk level of their investment. The notes issued by the CLOs are backed by diversified collateral asset portfolios consisting primarily of loans or structured debt. For managing the collateral of the CLO entities, the company earns investment management fees, including in some cases subordinated management fees, as well as contingent performance fees. The company has invested in certain of the entities, generally taking a portion of the unrated, junior subordinated position. The company's investments in CLOs are generally subordinated to other interests in the entities and entitle the company and other subordinated tranche investors to receive the residual cash flows, if any, from the entities. The company's subordinated interest can take the form of (1) subordinated notes, (2) income notes or (3) preference/preferred shares. The company has determined that, although the junior tranches have certain characteristics of equity, they should be accounted for and disclosed as debt on the company's Condensed Consolidated Balance Sheets, as the subordinated and income notes have a stated maturity indicating a date for which they are mandatorily redeemable. The preference shares are also classified as debt, as redemption is required only upon liquidation or termination of the CLO and not of the company. The company determined that it was the primary beneficiary of certain CLOs, as it has the power to direct the activities of the CLOs that most significantly impact the CLOs' economic performance, and the obligation to absorb losses/right to receive benefits from the CLOs that could potentially be significant to the CLOs. The primary beneficiary assessment includes an analysis of the rights of the company in its capacity as investment manager. In some CLOs, the company's role as investment manager provides that the company contractually has the power, as defined in ASC Topic 810, to direct the activities of the CLOs that most significantly impact the CLOs' economic performance, such as managing the collateral portfolio and the CLO's credit risk. In other CLOs, the company determined that it does not have this power in its role as investment manager due to certain rights held by other investors in the products or restrictions that limit the company's ability to manage the collateral portfolio and its credit risk. Additionally, the primary beneficiary assessment includes an analysis of the company's rights to receive benefits and obligations to absorb losses associated with its first loss position and management/performance fees. The company has elected the fair value option under ASC Topic 825-10-25 to measure the assets of all consolidated CLOs at fair value. All of the investments held by VIEs are presented at fair value in the company's Condensed Consolidated Balance Sheets at June 30, 2016 and December 31, 2015. The company adopted ASU 2014-13 on January 1, 2015, and accordingly the notes issued by consolidated CLOs are no longer carried at fair value but are now measured under the measurement alternative discussed in Accounting Standard Update 2014-13, "Measuring the Financial Assets and the Financial Liabilities of a Consolidated Collateralized Financing Entity" (ASU 2014-13). The measurement alternative requires that the reporting entity measure both the financial assets and the financial liabilities of the CFE by using the more observable of the fair value of the financial assets and the fair value of the financial liabilities, removing any measurement difference previously recorded as net income (loss) attributable to noncontrolling interests in consolidated entities and as an adjustment to retained earnings appropriated for investors in CIP. The company’s subsequent earnings from consolidated CLOs reflect changes in fair value of its own economic interests in the CLOs. Gains or losses on assets and liabilities of the CLOs are not attributed to noncontrolling interests but are offset in other gains/(losses) of CIP. Consolidation of Private Equity, Real Estate, and Fund-of-Funds The company also consolidates certain private equity funds and from time to time real estate funds that are structured as partnerships in which the company is the general partner receiving a management and/or performance fee. Private equity investments made by the underlying funds consist of direct investments in, or fund investments in other private equity funds that hold direct investments in, equity or debt securities in operating companies that are generally not initially publicly traded. Private equity funds are considered investment companies and are therefore accounted for under ASC Topic 946, “Financial Services - Investment Companies.” The company has retained the specialized industry accounting principles of these investment products in its Condensed Consolidated Financial Statements. See Note 13, “Consolidated Investment Products,” for additional details. Consolidation basis The Condensed Consolidated Financial Statements have been prepared primarily on the historical cost basis; however, certain items are presented using other bases such as fair value, where such treatment is required or voluntarily elected, as discussed above. The financial statements of subsidiaries, with the exception of certain CIP, are prepared for the same reporting period as the Parent and use consistent accounting policies, which, where applicable, have been adjusted to U.S. GAAP from local generally accepted accounting principles or reporting regulations. The financial information of certain CIP is included in the company's Condensed Consolidated Financial Statements on a one-month or a three-month lag based upon the availability of fund financial information. Noncontrolling interests in consolidated entities represents the interests in certain entities consolidated by the company either because the company has control over the entity or has determined that it is the primary beneficiary, but of which the company does not own all of the entity's equity. To the extent that noncontrolling interests represent equity which is redeemable or convertible for cash or other assets at the option of the equity holder, these are deemed to represent temporary equity, and are classified as equity attributable to redeemable noncontrolling interests in the Condensed Consolidated Balance Sheets. Nonredeemable noncontrolling interests are classified as a component of permanent equity.
Management and Investment Advisory Fees, Policy [Policy Text Block]	Money Market Fee Waivers The company is currently voluntarily providing yield support waivers of its management fees on certain money market funds to ensure that they maintain a minimum level of daily net investment income. During the three and six months ended June 30, 2016, yield support waivers resulted in a reduction of management and service and distribution fees of approximately $4.1 million and $9.0 million, respectively. During the three months ended June 30, 2016, approximately 54% of yield support waivers are offset by a reduction in third party distribution, service and advisory expenses (six months ended June 30, 2015: 50.4%), resulting in a net waiver of $1.9 million (six months ended June 30, 2015: $4.5 million). The company has provided yield support waivers in prior periods and may increase or decrease the level of fee waivers in future periods.
Accounting Pronouncements Recently Adopted and Pending Accounting Pronouncements	Accounting Pronouncements Recently Adopted and Pending Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update 2014-09, "Revenue from Contracts with Customers" (ASU 2014-09), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 was originally effective for fiscal years and interim periods within those years beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU 2014-09 by one year for periods beginning after December 15, 2017. Early adoption is permitted as of the original effective date and requires either a retrospective or a modified retrospective approach to adoption. In March 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Gross versus Net)” (ASU 2016-08). ASU 2016-08 clarified implementation guidance on determining if the entity acts as a principal or agent to the customer when another party is involved in providing goods or services. In April 2016, the FASB issued ASU 2016-10, “Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing” (ASU 2016-10). ASU 2016-10 clarifies guidance relating to identifying performance obligations and accounting for an entity’s promise to grant a license. In May 2016, the FASB issued ASU 2016-12, “Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients” (ASU 2016-12). ASU 2016-12 provides narrow-scope improvements relating to collectibility of consideration, presentation of sales and other similar taxes, noncash consideration, and the definition of completed contracts at transition. ASU 2016-12 also provides a practical expedient for dealing with contract modifications at transition and other technical corrections in applying the retrospective transition method. The company is currently evaluating the potential impact on its Consolidated Financial Statements, as well as the available transition methods. In February 2015, the FASB issued Accounting Standard Update 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis.” This standard modifies existing consolidation guidance for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. The company adopted ASU 2015-02 on January 1, 2016 using the modified retrospective approach, which did not require the restatement of prior periods to conform to the post-adoption presentation. The impacts of the adoption of ASU 2015-02 on January 1, 2016 were as follows: •The company consolidated CIP with total assets and liabilities/equity of $458.5 million. The company deconsolidated CIP with total assets and total liabilities and equity of $3,170.6 million, including CLOs of $2,366.5 million. •VOE partnership entities (consolidated private equity and fund-of-fund entities) became VIEs upon the adoption and were deconsolidated, along with certain VIE partnership entities. •The adoption resulted in the consolidation of certain investment products which became VIEs upon adoption and which were not previously consolidated. •The funds consolidated in prior periods as Consolidated Sponsored Investment Products, "CSIP," became VIEs. Accordingly, with effect from January 1, 2016, the consolidation of all VIEs is presented in the aggregate as part of CIP. See Notes 12, “Consolidated Sponsored Investment Products,” and 13, “Consolidated Investment Products.” In May 2015, the FASB issued Accounting Standards Update 2015-07, "Fair Value Measurement - Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)" (ASU 2015-07). ASU 2015-07 removes the requirement to categorize investments within the fair value hierarchy for which fair value is measured using the net asset value (NAV) practical expedient. The company adopted ASU 2015-07 on January 1, 2016; it required retrospective application for each prior period presented. The adoption did not impact the company's financial condition, results of operations or cash flows, as the update relates to financial statement disclosures. See Notes 12, "Consolidated Sponsored Investment Products," and 13, "Consolidated Investment Products." In January 2016, the FASB issued Accounting Standards Update 2016-01, “Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities” (ASU 2016-01). The standard amends certain aspects of recognition, measurement, presentation, and disclosure of financial assets and liabilities. ASU 2016-01 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017 and, in general, requires a modified retrospective approach to adoption. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments” (ASU 2016-13). ASU 2016-13 amends guidance on reporting credit losses for assets measured at amortized cost and available for sale securities. ASU 2016-13 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2019 and requires a modified retrospective approach to adoption. Early adoption in fiscal years, and interim periods within those years, beginning after December 15, 2018 is permitted. The company is currently evaluating the potential impacts of these standards as well as available transition methods. In February 2016, the FASB issued Accounting Standards Update 2016-02, “Leases” (ASU 2016-02). The standard requires that lessees recognize lease assets and lease liabilities on the balance sheet for all leases with a lease term greater than 12 months. ASU 2016-02 is effective for fiscal years and interim periods within those years beginning after December 15, 2018 and requires a modified retrospective approach to adoption. Early adoption is permitted. The company is currently evaluating the potential impact of this standard. In March 2016, the FASB issued Accounting Standards Update 2016-09, “Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting” (ASU 2016-09). The standard is intended to simplify aspects of the accounting for share-based payment transactions, including income tax impacts, classification on the statement of cash flows, and forfeitures. ASU 2016-09 is effective for fiscal years and interim periods within those years beginning after December 15, 2016. The various amendments within the standard require different approaches to adoption of either retrospective, modified retrospective or prospective. Early adoption is permitted. The company is currently evaluating the potential impact of this standard as well as the available transition methods.
Fair Value Measurement	The following is a description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of such assets and liabilities pursuant to the valuation hierarchy. Cash equivalents Cash investments in money market funds are valued under the market approach through the use of quoted market prices in an active market, which is the net asset value of the underlying funds, and are classified within level 1 of the valuation hierarchy. Available-for-sale investments Seed money is valued under the market approach through the use of quoted market prices available in an active market and is classified within level 1 of the valuation hierarchy; there is no modeling or additional information needed to arrive at the fair values of these investments. At June 30, 2016 and December 31, 2015, investments in CLOs were valued using pricing information obtained by an independent third-party pricing source. Due to liquidity constraints within the market for CLO products that require the use of unobservable inputs, these investments are classified within level 3 of the valuation hierarchy. Other debt securities are valued using a cost valuation technique due to the lack of available cash flow and market data and are accordingly also classified within level 3 of the valuation hierarchy. Trading investments •Investments related to deferred compensation plans Investments related to deferred compensation plans are valued under the market approach through the use of quoted prices in an active market and are classified within level 1 of the valuation hierarchy. •Seed money Seed money is valued under the market approach through the use of quoted market prices available in an active market and is classified within level 1 of the valuation hierarchy; there is no modeling or additional information needed to arrive at the fair values of these investments. •Other equity securities Other equity securities consist of investments in publicly-traded equity securities. These securities are valued under the market approach through the use of quoted prices on an exchange. To the extent these securities are actively traded, valuation adjustments are not applied and they are categorized within level 1 of the valuation hierarchy; otherwise, they are categorized in level 2. •UIT-related equity and debt securities The company invests in UIT-related equity and debt securities consisting of investments in corporate equities, UITs, and municipal securities. Each is discussed more fully below. Corporate equities The company temporarily holds investments in corporate equities for purposes of creating a UIT. Corporate equities are valued under the market approach through use of quoted prices on an exchange. To the extent these securities are actively traded, valuation adjustments are not applied and they are categorized within level 1 of the valuation hierarchy; otherwise, they are categorized in level 2. UITs The company may hold units of its sponsored UITs at period-end for sale in the primary market or secondary market. Equity UITs are valued under the market approach through use of quoted prices on an exchange. Fixed income UITs are valued using recently executed transaction prices, market price quotations (where observable), bond spreads, or credit default swap spreads. The spread data used is for the same maturities as the underlying bonds. If the spread data does not reference the issuers, then data that references comparable issuers is used. When observable price quotations are not available, fair value is determined based on cash flow models with yield curves, bond or single name credit default spreads, and recovery rates based on collateral value as key inputs. Depending on the nature of the inputs, these investments are categorized as level 1, 2, or 3. Municipal securities Municipal securities are valued using recently executed transaction prices, market price quotations (where observable), bond spreads, or credit default swap spreads. The spread data used is for the same maturities as the underlying bonds. If the spread data does not reference the issuers, then data that references comparable issuers is used. When observable price quotations are not available, fair value is determined based on cash flow models with yield curves, bond or single name credit default spreads, and recovery rates based on collateral value as key inputs. Depending on the nature of the inputs, these investments are categorized as level 1, 2, or 3. Put option contracts The company has purchased several put option contracts to hedge economically foreign currency risk on the translation of a portion of its pound sterling-denominated earnings into U.S. dollars (purchases of zero and $7.0 million in the three and six months ended June 30, 2016, respectively). These were the only contracts entered into during the period to hedge economically foreign currency risk and provide coverage through March 31, 2017. The economic hedge is predominantly triggered upon the impact of a significant decline in the Pound Sterling/U.S. Dollar foreign exchange rate. Open put option contracts are marked-to-market through earnings, which are recorded in the company's Condensed Consolidated Statements of Income in other gains and losses, net. These derivative contracts are valued using option valuation models and are included in other assets in the company's Condensed Consolidated Balance Sheets. The significant inputs in these models (volatility, forward points and swap curves) are readily available in public markets or can be derived from observable market transactions for substantially the full terms of the contracts and are classified within level 2 of the valuation hierarchy. The company recognized a $6.6 million and $9.1 million net gain in the three and six months ended June 30, 2016, respectively (three and six months ended June 30, 2015: $8.4 million and $7.8 million net loss, respectively) related to the change in market value of these put option contracts. Assets held for policyholders Assets held for policyholders are measured at fair value under the market approach based on the quoted prices of the underlying funds in an active market and are classified within level 1 of the valuation hierarchy. The policyholder payables are indexed to the value of the assets held for policyholders and are therefore not included in the tables below. UIT-related financial instruments sold, not yet purchased, and derivative instruments The company uses U.S. Treasury futures, which are types of derivative financial instruments, to hedge economically fixed income UIT inventory and securities in order to mitigate market risk. Open futures contracts are marked-to-market daily through earnings, which are recorded in the company’s Condensed Consolidated Statements of Income in other revenue, along with the mark-to-market on the underlying trading securities held. Fair values of derivative contracts in an asset position are included in other assets in the company’s Condensed Consolidated Balance Sheets. Fair values of derivative contracts in a liability position are included in other liabilities in the company’s Condensed Consolidated Balance Sheets. These derivative contracts are valued under the market approach through use of quoted prices in an active market and are classified within level 1 of the valuation hierarchy. At June 30, 2016 there were 10 futures contracts with a notional value of $1.7 million (December 31, 2015: 15 open futures contracts with a notional value of $1.9 million). Additionally, to hedge economically the market risk associated with equity and debt securities and UITs temporarily held as trading investments, the company will hold short positions in corporate equities, exchange-traded funds, or U.S. treasury security positions. These transactions are recorded as financial instruments sold, not yet purchased and are included in accounts payable and accrued expenses in the company’s Condensed Consolidated Balance Sheets. To the extent these securities are actively traded, valuation adjustments are not applied and they are categorized within level 1 of the valuation hierarchy; otherwise, they are categorized in level 2. Contingent Consideration Liability During 2015, the company acquired certain investment management contracts from Deutsche Bank. Indefinite-lived intangible assets were valued at $119.3 million. This transaction was a non-cash investing activity during that period. The purchase price was comprised solely of contingent consideration payable in future periods, and is linked to future revenues generated from the contracts. The contingent consideration liability was recorded at fair value as of the date of acquisition using a discounted cash flow model, and is categorized within level 3 of the valuation hierarchy. Anticipated future cash flows were determined using forecast AUM levels and discounted back to the valuation date. The company reassesses significant unobservable inputs during each reporting period. At June 30, 2016 inputs used in the model included assumed growth rates in AUM ranging from 0.69% to 6.67% (weighted average growth rate of 3.41%) and a discount rate of 3.33%. Changes in fair value are recorded in other gains and losses, net in the Condensed Consolidated Statements of Income in the period incurred. An increase in AUM levels and a decrease in the discount rate would increase the fair value of the contingent consideration liability while a decrease in forecasted AUM and an increase in the discount rate would decrease the liability.