Accounting Policies (Previously Reported Third-Party Distribution, Service And Advisory And Marketing Expenses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Third-party distribution, service and advisory expenses	$ 1,282.5	$ 1,053.8	$ 737.0
Marketing expenses	86.0	78.5	65.3
As Previously Reported [Member]
Third-party distribution, service and advisory expenses		972.7	693.4
Marketing expenses		159.6	108.9
Third-Party Distribution, Service And Advisory Expenses [Member]
Reclassification		81.1	43.6
Marketing Expenses [Member]
Reclassification		$ (81.1)	$ (43.6)

Includes: (1) renewal commissions paid to independent financial advisors for as long as the clients' assets are invested and are payments for the servicing of the client accounts, (2) the amortization of upfront commissions paid to brokers/dealers for sales of fund shares with a contingent deferred sales charge and (3) sub-transfer agency fees that are paid to a third party for transferring shares of a mutual fund or units of a unit trust into the investor's name.

No definition available.

Name:	ivz_ThirdPartyDistributionServiceAndAdvisory
Namespace Prefix:	ivz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration