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Investments (Summary of the Companies Voting Control in Entities Where it has Noncontrolling Interest) (Details) (Germany)
Dec. 31, 2014
VV Immobilien Verwaltungs und Beteiligungs Gmbh [Member]
  
Voting Interest Owned 70.00%ivz_NoncontrollingInterestVotingInterestOwnershipPercentagebyParent
/ us-gaap_StatementBusinessSegmentsAxis
= ivz_VvImmobilienVerwaltungsUndBeteiligungsGmbhMember
/ us-gaap_StatementGeographicalAxis
= country_DE
VV Immobilien Verwaltungs GmbH [Member]
  
Voting Interest Owned 70.00%ivz_NoncontrollingInterestVotingInterestOwnershipPercentagebyParent
/ us-gaap_StatementBusinessSegmentsAxis
= ivz_VvImmobilienVerwaltungsGmbhMember
/ us-gaap_StatementGeographicalAxis
= country_DE
HVH Immobilien und Beteiligungs GmbH [Member]
  
Voting Interest Owned 70.00%ivz_NoncontrollingInterestVotingInterestOwnershipPercentagebyParent
/ us-gaap_StatementBusinessSegmentsAxis
= ivz_HvhImmobilienUndBeteiligungsGmbhMember
/ us-gaap_StatementGeographicalAxis
= country_DE