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Investments (Summary of the Company's Investment in Joint Ventures and Affiliates) (Details)
Dec. 31, 2014
CHINA | Huaneng Invesco WLR Investment Consulting Company Limited [Member]  
Company's investments in joint ventures and affiliates 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
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= country_CN
CHINA | Invesco Great Wall Fund Management Company Limited [Member]  
Company's investments in joint ventures and affiliates 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ivz_InvescoGreatWalLfundManagementCompanyLimitedMember
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= country_CN
India | Religare Invesco Asset Management Company Private Ltd. [Member]  
Company's investments in joint ventures and affiliates 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ivz_ReligareInvescoAssetManagementCompanyPrivateLtdMember
/ us-gaap_StatementGeographicalAxis
= country_IN
India | Religare Trustee Company Private Ltd. [Member]  
Company's investments in joint ventures and affiliates 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ivz_ReligareTrusteeCompanyPrivateLtdMember
/ us-gaap_StatementGeographicalAxis
= country_IN
POLAND | Pocztylion - ARKA [Member]  
Company's investments in joint ventures and affiliates 29.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ivz_PocztylionArkaMember
/ us-gaap_StatementGeographicalAxis
= country_PL