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Other Comprehensive Income/(Loss) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Currency translation differences on investments in foreign subsidiaries $ (364.4)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax $ (121.9)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax $ 145.0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Currency translation differences on investments in foreign subsidiaries reclassified to appropriated retained earnings     0ivz_CurrencyTranslationDifferencesOnInvestmentsInOverseasSubsidiariesReclassifiedToAppropriatedRetainedEarnings
Noncontrolling Interests in Consolidated Entities [Member]      
Currency translation differences on investments in foreign subsidiaries   13.1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
0.9us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Currency translation differences on investments in foreign subsidiaries reclassified to appropriated retained earnings     6.3ivz_CurrencyTranslationDifferencesOnInvestmentsInOverseasSubsidiariesReclassifiedToAppropriatedRetainedEarnings
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Retained Earnings Appropriated For Investors In Consolidated Investment Products [Member]      
Currency translation differences on investments in foreign subsidiaries reclassified to appropriated retained earnings     $ (6.3)ivz_CurrencyTranslationDifferencesOnInvestmentsInOverseasSubsidiariesReclassifiedToAppropriatedRetainedEarnings
/ us-gaap_StatementEquityComponentsAxis
= ivz_RetainedEarningsAppropriatedForInvestorsInConsolidatedInvestmentProductsMember