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Long-Term Debt (Analysis Of Borrowings By Maturity) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt    
Long-term debt $ 1,589.3us-gaap_LongTermDebt $ 1,588.6us-gaap_LongTermDebt
Unsecured Debt [Member] | Due November 30, 2022 [Member]    
Debt    
Borrowings 599.6us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= ivz_DueNovember302022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		  
Unsecured Debt [Member] | Due January 30, 2024 [Member]    
Debt    
Borrowings 596.2us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= ivz_SeniorNotesDueJanuary302024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		  
Unsecured Debt [Member] | Due November 30, 2043 [Member]    
Debt    
Borrowings $ 393.5us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= ivz_SeniorNotesDueNovember302043Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember