Consolidated Investment Products (Company's Maximum Risk Of Loss In Significant VIE's) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
CLO [Member]
Variable Interest Entity [Line Items]
Carrying Value	$ 3.4
Company's Maximum Risk of Loss	3.4
Partnership and trust investments [Member]
Variable Interest Entity [Line Items]
Carrying Value	16.0
Company's Maximum Risk of Loss	16.0
Investments In Invesco Mortgage Capital Inc. [Member]
Variable Interest Entity [Line Items]
Carrying Value	29.7
Company's Maximum Risk of Loss	29.7
Total Maximum Risk Of Loss Associated With VIEs [Member]
Variable Interest Entity [Line Items]
Company's Maximum Risk of Loss	$ 49.1