Consolidated Sponsored Investment Products (Balances Related To CSIP) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Investments [Abstract]
Investments of CSIP	$ 288.5	$ 93.2
Cash and cash equivalents of CSIP	11.4	12.7
Accounts receivable and other assets of CSIP	5.9	2.6
Assets of consolidated sponsored investment products	305.8	108.5
Other liabilities of CSIP	(7.9)	(4.7)
Redeemable Noncontrolling Interest, Consolidated Sponsored Investment Products [Line Items]	(165.5)	0
Equity attributable to nonredeemable noncontrolling interests	(10.6)	(12.0)
Invesco's net interests in CSIP	$ 121.8	$ 91.8
Invesco's net interests as a percentage of investments of CSIP	42.20%	98.50%