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Retirement Benefit Plans (Assumed health care cost rates) (Details) (Medical Plan [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Medical Plan [Member]
      
Health care cost trend rate assumed for next year   7.60%ivz_DefinedBenefitPlanAssumedHealthCareCostTrendRateForNextYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember		 8.00%ivz_DefinedBenefitPlanAssumedHealthCareCostTrendRateForNextYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
Rate to which cost trend gradually declines 5.00%ivz_DefinedBenefitPlanRateToWhichAssumedHealthCareCostTrendRateWillGraduallyDecline
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember		 5.00%ivz_DefinedBenefitPlanRateToWhichAssumedHealthCareCostTrendRateWillGraduallyDecline
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember		 5.00%ivz_DefinedBenefitPlanRateToWhichAssumedHealthCareCostTrendRateWillGraduallyDecline
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
Year the rate reaches level it is assumed to remain thereafter 2020 2020 2020