XML 113 R93.htm IDEA: XBRL DOCUMENT v2.4.1.9
Retirement Benefit Plans (Analysis of plan assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair value of plan assets $ 424.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 413.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Retirement Plans [Member]    
Fair value of plan assets 420.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember		 407.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
Percentage of plan assets 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember		 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
Medical Plan [Member]    
Fair value of plan assets 7.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember		 10.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
Percentage of plan assets 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember		 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
Cash and Cash Equivalents [Member]    
Fair value of plan assets 7.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember		 0.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember
Cash and Cash Equivalents [Member] | Retirement Plans [Member]    
Fair value of plan assets 3.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember		 4.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember
Percentage of plan assets 0.90%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember		 1.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember
Cash and Cash Equivalents [Member] | Medical Plan [Member]    
Fair value of plan assets 7.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember		 0.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember
Percentage of plan assets 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember		 2.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember
Fund Investments [Member]    
Fair value of plan assets 197.5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember		 202.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember
Fund Investments [Member] | Retirement Plans [Member]    
Fair value of plan assets 197.5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember		 193.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember
Percentage of plan assets 46.90%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember		 47.30%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember
Fund Investments [Member] | Medical Plan [Member]    
Fair value of plan assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember		 9.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember
Percentage of plan assets 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember		 98.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_FundInvestmentsMember
Equity Securities [Member]    
Fair value of plan assets 124.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 122.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Equity Securities [Member] | Retirement Plans [Member]    
Fair value of plan assets 124.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 122.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Percentage of plan assets 29.70%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 30.20%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Equity Securities [Member] | Medical Plan [Member]    
Fair value of plan assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Percentage of plan assets 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Government Debt Securities [Member]    
Fair value of plan assets 76.5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember		 65.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember
Government Debt Securities [Member] | Retirement Plans [Member]    
Fair value of plan assets 76.5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember		 65.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember
Percentage of plan assets 18.20%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember		 16.10%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember
Government Debt Securities [Member] | Medical Plan [Member]    
Fair value of plan assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember
Percentage of plan assets 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember		 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GovernmentDebtSecuritiesMember
Other Assets [Member]    
Fair value of plan assets 4.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember		 6.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember
Other Assets [Member] | Retirement Plans [Member]    
Fair value of plan assets 4.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember		 6.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember
Percentage of plan assets 1.20%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember		 1.60%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember
Other Assets [Member] | Medical Plan [Member]    
Fair value of plan assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember
Percentage of plan assets 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember		 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherAssetsMember
Guaranteed Investments Contracts [Member]    
Fair value of plan assets 13.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember		 15.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember
Guaranteed Investments Contracts [Member] | Retirement Plans [Member]    
Fair value of plan assets 13.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember		 15.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember
Percentage of plan assets 3.10%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember		 3.70%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_RetirementPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember
Guaranteed Investments Contracts [Member] | Medical Plan [Member]    
Fair value of plan assets $ 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember		 $ 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember
Percentage of plan assets 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember		 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ivz_MedicalPlansMember
/ us-gaap_InvestmentTypeAxis
= ivz_GuaranteedInvestmentsContractsMember