Consolidated Investment Products (Company's Maximum Risk Of Loss In Significant VIE's) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Partnership and trust investments [Member]
Variable Interest Entity [Line Items]
Carrying Value	$ 32.1
Company's Maximum Risk of Loss	32.1
Total committed support	32.1
Investments In Invesco Mortgage Capital Inc. [Member]
Variable Interest Entity [Line Items]
Carrying Value	25.5
Company's Maximum Risk of Loss	25.5
Total committed support	25.5
Support agreements [Member]
Variable Interest Entity [Line Items]
Carrying Value	(1.0)	[1]
Company's Maximum Risk of Loss	41.0	[1]
Total committed support	41.0	[1]
Guarantor Obligations, Maximum Exposure, Undiscounted	41.0
Guarantor obligations, increase in maximum exposure, undiscounted	66.0
Total Maximum Risk Of Loss Associated With VIEs [Member]
Variable Interest Entity [Line Items]
Company's Maximum Risk of Loss	98.6
Total committed support	$ 98.6

[1] As of December 31, 2011, the committed support under these agreements was $41.0 million with an internal approval mechanism to increase the maximum possible support to $66.0 million at the option of the company.